[InstSimplify] Add tests that fold instructions with poison operands (NFC)

23 files changed, 920 insertions, 9 deletions

diff --git a/llvm/test/Transforms/InstSimplify/add.ll b/llvm/test/Transforms/InstSimplify/add.ll
index 21cc905688b2..b271c87d188f 100644
--- a/llvm/test/Transforms/InstSimplify/add.ll
+++ b/llvm/test/Transforms/InstSimplify/add.ll
@@ -30,7 +30,7 @@ define <2 x i32> @negated_operand_commute_vec(<2 x i32> %x) {
 
 define i8 @knownnegation(i8 %x, i8 %y) {
 ; CHECK-LABEL: @knownnegation(
-; CHECK-NEXT:    ret i8 0 
+; CHECK-NEXT:    ret i8 0
 ;
   %xy = sub i8 %x, %y
   %yx = sub i8 %y, %x
@@ -48,4 +48,10 @@ define <2 x i8> @knownnegation_commute_vec(<2 x i8> %x, <2 x i8> %y) {
   ret <2 x i8> %r
 }
 
-
+define i32 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 poison
+;
+  %y = add i32 %x, poison
+  ret i32 %y
+}
diff --git a/llvm/test/Transforms/InstSimplify/and.ll b/llvm/test/Transforms/InstSimplify/and.ll
new file mode 100644
index 000000000000..f199bd14f644
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/and.ll
@@ -0,0 +1,12 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+; TODO: this should be poison
+
+define i32 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 0
+;
+  %v = and i32 %x, poison
+  ret i32 %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/call.ll b/llvm/test/Transforms/InstSimplify/call.ll
index 6579bda52795..bfbd101b046c 100644
--- a/llvm/test/Transforms/InstSimplify/call.ll
+++ b/llvm/test/Transforms/InstSimplify/call.ll
@@ -35,6 +35,14 @@ define {i8, i1} @test_uadd3(i8 %v) {
   ret {i8, i1} %result
 }
 
+define {i8, i1} @test_uadd3_poison(i8 %v) {
+; CHECK-LABEL: @test_uadd3_poison(
+; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
+;
+  %result = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 %v, i8 poison)
+  ret {i8, i1} %result
+}
+
 define {i8, i1} @test_uadd4(i8 %v) {
 ; CHECK-LABEL: @test_uadd4(
 ; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
@@ -43,6 +51,14 @@ define {i8, i1} @test_uadd4(i8 %v) {
   ret {i8, i1} %result
 }
 
+define {i8, i1} @test_uadd4_poison(i8 %v) {
+; CHECK-LABEL: @test_uadd4_poison(
+; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
+;
+  %result = call {i8, i1} @llvm.uadd.with.overflow.i8(i8 poison, i8 %v)
+  ret {i8, i1} %result
+}
+
 define i1 @test_sadd1() {
 ; CHECK-LABEL: @test_sadd1(
 ; CHECK-NEXT:    ret i1 true
@@ -69,6 +85,14 @@ define {i8, i1} @test_sadd3(i8 %v) {
   ret {i8, i1} %result
 }
 
+define {i8, i1} @test_sadd3_poison(i8 %v) {
+; CHECK-LABEL: @test_sadd3_poison(
+; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
+;
+  %result = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 %v, i8 poison)
+  ret {i8, i1} %result
+}
+
 define {i8, i1} @test_sadd4(i8 %v) {
 ; CHECK-LABEL: @test_sadd4(
 ; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
@@ -77,6 +101,14 @@ define {i8, i1} @test_sadd4(i8 %v) {
   ret {i8, i1} %result
 }
 
+define {i8, i1} @test_sadd4_poison(i8 %v) {
+; CHECK-LABEL: @test_sadd4_poison(
+; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
+;
+  %result = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 poison, i8 %v)
+  ret {i8, i1} %result
+}
+
 define {i8, i1} @test_usub1(i8 %V) {
 ; CHECK-LABEL: @test_usub1(
 ; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
@@ -93,6 +125,14 @@ define {i8, i1} @test_usub2(i8 %V) {
   ret {i8, i1} %x
 }
 
+define {i8, i1} @test_usub2_poison(i8 %V) {
+; CHECK-LABEL: @test_usub2_poison(
+; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
+;
+  %x = call {i8, i1} @llvm.usub.with.overflow.i8(i8 %V, i8 poison)
+  ret {i8, i1} %x
+}
+
 define {i8, i1} @test_usub3(i8 %V) {
 ; CHECK-LABEL: @test_usub3(
 ; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
@@ -101,6 +141,14 @@ define {i8, i1} @test_usub3(i8 %V) {
   ret {i8, i1} %x
 }
 
+define {i8, i1} @test_usub3_poison(i8 %V) {
+; CHECK-LABEL: @test_usub3_poison(
+; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
+;
+  %x = call {i8, i1} @llvm.usub.with.overflow.i8(i8 poison, i8 %V)
+  ret {i8, i1} %x
+}
+
 define {i8, i1} @test_ssub1(i8 %V) {
 ; CHECK-LABEL: @test_ssub1(
 ; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
@@ -117,6 +165,14 @@ define {i8, i1} @test_ssub2(i8 %V) {
   ret {i8, i1} %x
 }
 
+define {i8, i1} @test_ssub2_poison(i8 %V) {
+; CHECK-LABEL: @test_ssub2_poison(
+; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
+;
+  %x = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 %V, i8 poison)
+  ret {i8, i1} %x
+}
+
 define {i8, i1} @test_ssub3(i8 %V) {
 ; CHECK-LABEL: @test_ssub3(
 ; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
@@ -125,6 +181,14 @@ define {i8, i1} @test_ssub3(i8 %V) {
   ret {i8, i1} %x
 }
 
+define {i8, i1} @test_ssub3_poison(i8 %V) {
+; CHECK-LABEL: @test_ssub3_poison(
+; CHECK-NEXT:    ret { i8, i1 } { i8 undef, i1 false }
+;
+  %x = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 poison, i8 %V)
+  ret {i8, i1} %x
+}
+
 define {i8, i1} @test_umul1(i8 %V) {
 ; CHECK-LABEL: @test_umul1(
 ; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
@@ -141,6 +205,14 @@ define {i8, i1} @test_umul2(i8 %V) {
   ret {i8, i1} %x
 }
 
+define {i8, i1} @test_umul2_poison(i8 %V) {
+; CHECK-LABEL: @test_umul2_poison(
+; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
+;
+  %x = call {i8, i1} @llvm.umul.with.overflow.i8(i8 %V, i8 poison)
+  ret {i8, i1} %x
+}
+
 define {i8, i1} @test_umul3(i8 %V) {
 ; CHECK-LABEL: @test_umul3(
 ; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
@@ -157,6 +229,14 @@ define {i8, i1} @test_umul4(i8 %V) {
   ret {i8, i1} %x
 }
 
+define {i8, i1} @test_umul4_poison(i8 %V) {
+; CHECK-LABEL: @test_umul4_poison(
+; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
+;
+  %x = call {i8, i1} @llvm.umul.with.overflow.i8(i8 poison, i8 %V)
+  ret {i8, i1} %x
+}
+
 define {i8, i1} @test_smul1(i8 %V) {
 ; CHECK-LABEL: @test_smul1(
 ; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
@@ -173,6 +253,14 @@ define {i8, i1} @test_smul2(i8 %V) {
   ret {i8, i1} %x
 }
 
+define {i8, i1} @test_smul2_poison(i8 %V) {
+; CHECK-LABEL: @test_smul2_poison(
+; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
+;
+  %x = call {i8, i1} @llvm.smul.with.overflow.i8(i8 %V, i8 poison)
+  ret {i8, i1} %x
+}
+
 define {i8, i1} @test_smul3(i8 %V) {
 ; CHECK-LABEL: @test_smul3(
 ; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
@@ -189,6 +277,14 @@ define {i8, i1} @test_smul4(i8 %V) {
   ret {i8, i1} %x
 }
 
+define {i8, i1} @test_smul4_poison(i8 %V) {
+; CHECK-LABEL: @test_smul4_poison(
+; CHECK-NEXT:    ret { i8, i1 } zeroinitializer
+;
+  %x = call {i8, i1} @llvm.smul.with.overflow.i8(i8 poison, i8 %V)
+  ret {i8, i1} %x
+}
+
 ; Test a non-intrinsic that we know about as a library call.
 declare float @fabs(float %x)
 
@@ -742,6 +838,108 @@ define i9 @fshr_shift_undef(i9 %x, i9 %y) {
   ret i9 %r
 }
 
+; If one of operands is poison, the result is poison
+; TODO: these should be poison
+define i8 @fshl_ops_poison(i8 %b, i8 %shamt) {
+; CHECK-LABEL: @fshl_ops_poison(
+; CHECK-NEXT:    [[R:%.*]] = call i8 @llvm.fshl.i8(i8 poison, i8 [[B:%.*]], i8 [[SHAMT:%.*]])
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %r = call i8 @llvm.fshl.i8(i8 poison, i8 %b, i8 %shamt)
+  ret i8 %r
+}
+
+define i8 @fshl_ops_poison2(i8 %shamt) {
+; CHECK-LABEL: @fshl_ops_poison2(
+; CHECK-NEXT:    ret i8 undef
+;
+  %r = call i8 @llvm.fshl.i8(i8 poison, i8 undef, i8 %shamt)
+  ret i8 %r
+}
+
+define i8 @fshl_ops_poison3(i8 %a, i8 %shamt) {
+; CHECK-LABEL: @fshl_ops_poison3(
+; CHECK-NEXT:    [[R:%.*]] = call i8 @llvm.fshl.i8(i8 [[A:%.*]], i8 poison, i8 [[SHAMT:%.*]])
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %r = call i8 @llvm.fshl.i8(i8 %a, i8 poison, i8 %shamt)
+  ret i8 %r
+}
+
+define i8 @fshl_ops_poison4(i8 %shamt) {
+; CHECK-LABEL: @fshl_ops_poison4(
+; CHECK-NEXT:    ret i8 undef
+;
+  %r = call i8 @llvm.fshl.i8(i8 undef, i8 poison, i8 %shamt)
+  ret i8 %r
+}
+
+define i8 @fshl_ops_poison5(i8 %a, i8 %b) {
+; CHECK-LABEL: @fshl_ops_poison5(
+; CHECK-NEXT:    ret i8 [[A:%.*]]
+;
+  %r = call i8 @llvm.fshl.i8(i8 %a, i8 %b, i8 poison)
+  ret i8 %r
+}
+
+define i8 @fshl_ops_poison6() {
+; CHECK-LABEL: @fshl_ops_poison6(
+; CHECK-NEXT:    ret i8 undef
+;
+  %r = call i8 @llvm.fshl.i8(i8 undef, i8 undef, i8 poison)
+  ret i8 %r
+}
+
+define i9 @fshr_ops_poison(i9 %b, i9 %shamt) {
+; CHECK-LABEL: @fshr_ops_poison(
+; CHECK-NEXT:    [[R:%.*]] = call i9 @llvm.fshr.i9(i9 poison, i9 [[B:%.*]], i9 [[SHAMT:%.*]])
+; CHECK-NEXT:    ret i9 [[R]]
+;
+  %r = call i9 @llvm.fshr.i9(i9 poison, i9 %b, i9 %shamt)
+  ret i9 %r
+}
+
+define i9 @fshr_ops_poison2(i9 %shamt) {
+; CHECK-LABEL: @fshr_ops_poison2(
+; CHECK-NEXT:    ret i9 undef
+;
+  %r = call i9 @llvm.fshr.i9(i9 poison, i9 undef, i9 %shamt)
+  ret i9 %r
+}
+
+define i9 @fshr_ops_poison3(i9 %a, i9 %shamt) {
+; CHECK-LABEL: @fshr_ops_poison3(
+; CHECK-NEXT:    [[R:%.*]] = call i9 @llvm.fshr.i9(i9 [[A:%.*]], i9 poison, i9 [[SHAMT:%.*]])
+; CHECK-NEXT:    ret i9 [[R]]
+;
+  %r = call i9 @llvm.fshr.i9(i9 %a, i9 poison, i9 %shamt)
+  ret i9 %r
+}
+
+define i9 @fshr_ops_poison4(i9 %shamt) {
+; CHECK-LABEL: @fshr_ops_poison4(
+; CHECK-NEXT:    ret i9 undef
+;
+  %r = call i9 @llvm.fshr.i9(i9 undef, i9 poison, i9 %shamt)
+  ret i9 %r
+}
+
+define i9 @fshr_ops_poison5(i9 %a, i9 %b) {
+; CHECK-LABEL: @fshr_ops_poison5(
+; CHECK-NEXT:    ret i9 [[B:%.*]]
+;
+  %r = call i9 @llvm.fshr.i9(i9 %a, i9 %b, i9 poison)
+  ret i9 %r
+}
+
+define i9 @fshr_ops_poison6() {
+; CHECK-LABEL: @fshr_ops_poison6(
+; CHECK-NEXT:    ret i9 undef
+;
+  %r = call i9 @llvm.fshr.i9(i9 undef, i9 undef, i9 poison)
+  ret i9 %r
+}
+
 declare double @llvm.fma.f64(double,double,double)
 declare double @llvm.fmuladd.f64(double,double,double)
 
@@ -753,6 +951,14 @@ define double @fma_undef_op0(double %x, double %y) {
   ret double %r
 }
 
+define double @fma_poison_op0(double %x, double %y) {
+; CHECK-LABEL: @fma_poison_op0(
+; CHECK-NEXT:    ret double 0x7FF8000000000000
+;
+  %r = call double @llvm.fma.f64(double poison, double %x, double %y)
+  ret double %r
+}
+
 define double @fma_undef_op1(double %x, double %y) {
 ; CHECK-LABEL: @fma_undef_op1(
 ; CHECK-NEXT:    ret double 0x7FF8000000000000
@@ -761,6 +967,14 @@ define double @fma_undef_op1(double %x, double %y) {
   ret double %r
 }
 
+define double @fma_poison_op1(double %x, double %y) {
+; CHECK-LABEL: @fma_poison_op1(
+; CHECK-NEXT:    ret double 0x7FF8000000000000
+;
+  %r = call double @llvm.fma.f64(double %x, double poison, double %y)
+  ret double %r
+}
+
 define double @fma_undef_op2(double %x, double %y) {
 ; CHECK-LABEL: @fma_undef_op2(
 ; CHECK-NEXT:    ret double 0x7FF8000000000000
@@ -769,6 +983,14 @@ define double @fma_undef_op2(double %x, double %y) {
   ret double %r
 }
 
+define double @fma_poison_op2(double %x, double %y) {
+; CHECK-LABEL: @fma_poison_op2(
+; CHECK-NEXT:    ret double 0x7FF8000000000000
+;
+  %r = call double @llvm.fma.f64(double %x, double %y, double poison)
+  ret double %r
+}
+
 define double @fmuladd_undef_op0(double %x, double %y) {
 ; CHECK-LABEL: @fmuladd_undef_op0(
 ; CHECK-NEXT:    ret double 0x7FF8000000000000
@@ -777,6 +999,14 @@ define double @fmuladd_undef_op0(double %x, double %y) {
   ret double %r
 }
 
+define double @fmuladd_poison_op0(double %x, double %y) {
+; CHECK-LABEL: @fmuladd_poison_op0(
+; CHECK-NEXT:    ret double 0x7FF8000000000000
+;
+  %r = call double @llvm.fmuladd.f64(double poison, double %x, double %y)
+  ret double %r
+}
+
 define double @fmuladd_undef_op1(double %x, double %y) {
 ; CHECK-LABEL: @fmuladd_undef_op1(
 ; CHECK-NEXT:    ret double 0x7FF8000000000000
@@ -785,6 +1015,14 @@ define double @fmuladd_undef_op1(double %x, double %y) {
   ret double %r
 }
 
+define double @fmuladd_poison_op1(double %x, double %y) {
+; CHECK-LABEL: @fmuladd_poison_op1(
+; CHECK-NEXT:    ret double 0x7FF8000000000000
+;
+  %r = call double @llvm.fmuladd.f64(double %x, double poison, double %y)
+  ret double %r
+}
+
 define double @fmuladd_undef_op2(double %x, double %y) {
 ; CHECK-LABEL: @fmuladd_undef_op2(
 ; CHECK-NEXT:    ret double 0x7FF8000000000000
@@ -793,6 +1031,14 @@ define double @fmuladd_undef_op2(double %x, double %y) {
   ret double %r
 }
 
+define double @fmuladd_poison_op2(double %x, double %y) {
+; CHECK-LABEL: @fmuladd_poison_op2(
+; CHECK-NEXT:    ret double 0x7FF8000000000000
+;
+  %r = call double @llvm.fmuladd.f64(double %x, double %y, double poison)
+  ret double %r
+}
+
 define double @fma_nan_op0(double %x, double %y) {
 ; CHECK-LABEL: @fma_nan_op0(
 ; CHECK-NEXT:    ret double 0x7FF8000000000000
@@ -1043,7 +1289,7 @@ define i32 @call_undef_musttail() {
 
 define float @nobuiltin_fmax() {
 ; CHECK-LABEL: @nobuiltin_fmax(
-; CHECK-NEXT:    [[M:%.*]] = call float @fmaxf(float 0.000000e+00, float 1.000000e+00) #3
+; CHECK-NEXT:    [[M:%.*]] = call float @fmaxf(float 0.000000e+00, float 1.000000e+00) [[ATTR3:#.*]]
 ; CHECK-NEXT:    [[R:%.*]] = call float @llvm.fabs.f32(float [[M]])
 ; CHECK-NEXT:    ret float [[R]]
 ;
diff --git a/llvm/test/Transforms/InstSimplify/div.ll b/llvm/test/Transforms/InstSimplify/div.ll
index d3db9b13bfbc..d2ba41c5afd7 100644
--- a/llvm/test/Transforms/InstSimplify/div.ll
+++ b/llvm/test/Transforms/InstSimplify/div.ll
@@ -186,7 +186,7 @@ declare i32 @external()
 
 define i32 @div1() {
 ; CHECK-LABEL: @div1(
-; CHECK-NEXT:    [[CALL:%.*]] = call i32 @external(), !range !0
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @external(), [[RNG0:!range !.*]]
 ; CHECK-NEXT:    ret i32 0
 ;
   %call = call i32 @external(), !range !0
@@ -195,10 +195,36 @@ define i32 @div1() {
 }
 
 define i8 @sdiv_minusone_divisor() {
-; CHECK-LABEL: @sdiv_minusone_divisor
-; CHECK-NEXT:   ret i8 poison
+; CHECK-LABEL: @sdiv_minusone_divisor(
+; CHECK-NEXT:    ret i8 poison
+;
   %v = sdiv i8 -128, -1
   ret i8 %v
 }
 
+; TODO: these should be poison
+define i32 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 poison
+;
+  %v = udiv i32 %x, poison
+  ret i32 %v
+}
+
+define i32 @poison2(i32 %x) {
+; CHECK-LABEL: @poison2(
+; CHECK-NEXT:    ret i32 0
+;
+  %v = udiv i32 poison, %x
+  ret i32 %v
+}
+
+define <2 x i32> @poison3(<2 x i32> %x) {
+; CHECK-LABEL: @poison3(
+; CHECK-NEXT:    ret <2 x i32> undef
+;
+  %v = udiv <2 x i32> %x, <i32 poison, i32 1>
+  ret <2 x i32> %v
+}
+
 !0 = !{i32 0, i32 3}
diff --git a/llvm/test/Transforms/InstSimplify/extract-element.ll b/llvm/test/Transforms/InstSimplify/extract-element.ll
index ef12a78d1dc0..38e4fd9a2af7 100644
--- a/llvm/test/Transforms/InstSimplify/extract-element.ll
+++ b/llvm/test/Transforms/InstSimplify/extract-element.ll
@@ -37,6 +37,15 @@ define i129 @vec_extract_undef_index(<3 x i129> %a) {
 }
 
 
+define i129 @vec_extract_poison_index(<3 x i129> %a) {
+; CHECK-LABEL: @vec_extract_poison_index(
+; CHECK-NEXT:    ret i129 undef
+;
+  %E1 = extractelement <3 x i129> %a, i129 poison
+  ret i129 %E1
+}
+
+
 define i129 @vec_extract_in_bounds(<3 x i129> %a) {
 ; CHECK-LABEL: @vec_extract_in_bounds(
 ; CHECK-NEXT:    [[E1:%.*]] = extractelement <3 x i129> [[A:%.*]], i129 2
diff --git a/llvm/test/Transforms/InstSimplify/fcmp.ll b/llvm/test/Transforms/InstSimplify/fcmp.ll
new file mode 100644
index 000000000000..5adcfadb6507
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/fcmp.ll
@@ -0,0 +1,19 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+; TODO: these should be poison
+define i1 @poison(float %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i1 false
+;
+  %v = fcmp oeq float %x, poison
+  ret i1 %v
+}
+
+define i1 @poison2(float %x) {
+; CHECK-LABEL: @poison2(
+; CHECK-NEXT:    ret i1 true
+;
+  %v = fcmp ueq float %x, poison
+  ret i1 %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/fminmax-folds.ll b/llvm/test/Transforms/InstSimplify/fminmax-folds.ll
index e87c2f1d1260..92b9204d3d66 100644
--- a/llvm/test/Transforms/InstSimplify/fminmax-folds.ll
+++ b/llvm/test/Transforms/InstSimplify/fminmax-folds.ll
@@ -526,6 +526,14 @@ define float @maxnum_undef_op1(float %x) {
   ret float %val
 }
 
+define float @maxnum_poison_op1(float %x) {
+; CHECK-LABEL: @maxnum_poison_op1(
+; CHECK-NEXT:    ret float [[X:%.*]]
+;
+  %val = call float @llvm.maxnum.f32(float %x, float poison)
+  ret float %val
+}
+
 define float @maxnum_undef_op0(float %x) {
 ; CHECK-LABEL: @maxnum_undef_op0(
 ; CHECK-NEXT:    ret float [[X:%.*]]
@@ -534,6 +542,14 @@ define float @maxnum_undef_op0(float %x) {
   ret float %val
 }
 
+define float @maxnum_poison_op0(float %x) {
+; CHECK-LABEL: @maxnum_poison_op0(
+; CHECK-NEXT:    ret float [[X:%.*]]
+;
+  %val = call float @llvm.maxnum.f32(float poison, float %x)
+  ret float %val
+}
+
 define float @minnum_undef_op1(float %x) {
 ; CHECK-LABEL: @minnum_undef_op1(
 ; CHECK-NEXT:    ret float [[X:%.*]]
@@ -542,6 +558,14 @@ define float @minnum_undef_op1(float %x) {
   ret float %val
 }
 
+define float @minnum_poison_op1(float %x) {
+; CHECK-LABEL: @minnum_poison_op1(
+; CHECK-NEXT:    ret float [[X:%.*]]
+;
+  %val = call float @llvm.minnum.f32(float %x, float poison)
+  ret float %val
+}
+
 define float @minnum_undef_op0(float %x) {
 ; CHECK-LABEL: @minnum_undef_op0(
 ; CHECK-NEXT:    ret float [[X:%.*]]
@@ -550,6 +574,14 @@ define float @minnum_undef_op0(float %x) {
   ret float %val
 }
 
+define float @minnum_poison_op0(float %x) {
+; CHECK-LABEL: @minnum_poison_op0(
+; CHECK-NEXT:    ret float [[X:%.*]]
+;
+  %val = call float @llvm.minnum.f32(float poison, float %x)
+  ret float %val
+}
+
 define float @minnum_undef_undef(float %x) {
 ; CHECK-LABEL: @minnum_undef_undef(
 ; CHECK-NEXT:    ret float undef
@@ -558,6 +590,22 @@ define float @minnum_undef_undef(float %x) {
   ret float %val
 }
 
+define float @minnum_poison_undef(float %x) {
+; CHECK-LABEL: @minnum_poison_undef(
+; CHECK-NEXT:    ret float undef
+;
+  %val = call float @llvm.minnum.f32(float poison, float undef)
+  ret float %val
+}
+
+define float @minnum_undef_poison(float %x) {
+; CHECK-LABEL: @minnum_undef_poison(
+; CHECK-NEXT:    ret float poison
+;
+  %val = call float @llvm.minnum.f32(float undef, float poison)
+  ret float %val
+}
+
 define float @maxnum_undef_undef(float %x) {
 ; CHECK-LABEL: @maxnum_undef_undef(
 ; CHECK-NEXT:    ret float undef
@@ -566,6 +614,22 @@ define float @maxnum_undef_undef(float %x) {
   ret float %val
 }
 
+define float @maxnum_poison_undef(float %x) {
+; CHECK-LABEL: @maxnum_poison_undef(
+; CHECK-NEXT:    ret float undef
+;
+  %val = call float @llvm.maxnum.f32(float poison, float undef)
+  ret float %val
+}
+
+define float @maxnum_undef_poison(float %x) {
+; CHECK-LABEL: @maxnum_undef_poison(
+; CHECK-NEXT:    ret float poison
+;
+  %val = call float @llvm.maxnum.f32(float undef, float poison)
+  ret float %val
+}
+
 define float @minnum_same_args(float %x) {
 ; CHECK-LABEL: @minnum_same_args(
 ; CHECK-NEXT:    ret float [[X:%.*]]
@@ -862,6 +926,14 @@ define float @maximum_undef_op1(float %x) {
   ret float %val
 }
 
+define float @maximum_poison_op1(float %x) {
+; CHECK-LABEL: @maximum_poison_op1(
+; CHECK-NEXT:    ret float [[X:%.*]]
+;
+  %val = call float @llvm.maximum.f32(float %x, float poison)
+  ret float %val
+}
+
 define float @maximum_undef_op0(float %x) {
 ; CHECK-LABEL: @maximum_undef_op0(
 ; CHECK-NEXT:    ret float [[X:%.*]]
@@ -870,6 +942,14 @@ define float @maximum_undef_op0(float %x) {
   ret float %val
 }
 
+define float @maximum_poison_op0(float %x) {
+; CHECK-LABEL: @maximum_poison_op0(
+; CHECK-NEXT:    ret float [[X:%.*]]
+;
+  %val = call float @llvm.maximum.f32(float poison, float %x)
+  ret float %val
+}
+
 define float @minimum_undef_op1(float %x) {
 ; CHECK-LABEL: @minimum_undef_op1(
 ; CHECK-NEXT:    ret float [[X:%.*]]
@@ -878,6 +958,14 @@ define float @minimum_undef_op1(float %x) {
   ret float %val
 }
 
+define float @minimum_poison_op1(float %x) {
+; CHECK-LABEL: @minimum_poison_op1(
+; CHECK-NEXT:    ret float [[X:%.*]]
+;
+  %val = call float @llvm.minimum.f32(float %x, float poison)
+  ret float %val
+}
+
 define float @minimum_undef_op0(float %x) {
 ; CHECK-LABEL: @minimum_undef_op0(
 ; CHECK-NEXT:    ret float [[X:%.*]]
@@ -886,6 +974,14 @@ define float @minimum_undef_op0(float %x) {
   ret float %val
 }
 
+define float @minimum_poison_op0(float %x) {
+; CHECK-LABEL: @minimum_poison_op0(
+; CHECK-NEXT:    ret float [[X:%.*]]
+;
+  %val = call float @llvm.minimum.f32(float poison, float %x)
+  ret float %val
+}
+
 define float @minimum_undef_undef(float %x) {
 ; CHECK-LABEL: @minimum_undef_undef(
 ; CHECK-NEXT:    ret float undef
diff --git a/llvm/test/Transforms/InstSimplify/fp-undef.ll b/llvm/test/Transforms/InstSimplify/fp-undef-poison.ll
index 7b11955d9b35..696dc84bd4ce 100644
--- a/llvm/test/Transforms/InstSimplify/fp-undef.ll
+++ b/llvm/test/Transforms/InstSimplify/fp-undef-poison.ll
@@ -1,6 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instsimplify -S | FileCheck %s
 
+; TODO: the instructions with poison operands should return poison
+
 define float @fadd_undef_op0(float %x) {
 ; CHECK-LABEL: @fadd_undef_op0(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -9,6 +11,14 @@ define float @fadd_undef_op0(float %x) {
   ret float %r
 }
 
+define float @fadd_poison_op0(float %x) {
+; CHECK-LABEL: @fadd_poison_op0(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = fadd float poison, %x
+  ret float %r
+}
+
 define float @fadd_undef_op1(float %x) {
 ; CHECK-LABEL: @fadd_undef_op1(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -17,6 +27,14 @@ define float @fadd_undef_op1(float %x) {
   ret float %r
 }
 
+define float @fadd_poison_op1(float %x) {
+; CHECK-LABEL: @fadd_poison_op1(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = fadd float %x, poison
+  ret float %r
+}
+
 define float @fsub_undef_op0(float %x) {
 ; CHECK-LABEL: @fsub_undef_op0(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -25,6 +43,14 @@ define float @fsub_undef_op0(float %x) {
   ret float %r
 }
 
+define float @fsub_poison_op0(float %x) {
+; CHECK-LABEL: @fsub_poison_op0(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = fsub float poison, %x
+  ret float %r
+}
+
 define float @fsub_undef_op1(float %x) {
 ; CHECK-LABEL: @fsub_undef_op1(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -33,6 +59,14 @@ define float @fsub_undef_op1(float %x) {
   ret float %r
 }
 
+define float @fsub_poison_op1(float %x) {
+; CHECK-LABEL: @fsub_poison_op1(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = fsub float %x, poison
+  ret float %r
+}
+
 define float @fmul_undef_op0(float %x) {
 ; CHECK-LABEL: @fmul_undef_op0(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -41,6 +75,14 @@ define float @fmul_undef_op0(float %x) {
   ret float %r
 }
 
+define float @fmul_poison_op0(float %x) {
+; CHECK-LABEL: @fmul_poison_op0(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = fmul float poison, %x
+  ret float %r
+}
+
 define float @fmul_undef_op1(float %x) {
 ; CHECK-LABEL: @fmul_undef_op1(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -49,6 +91,14 @@ define float @fmul_undef_op1(float %x) {
   ret float %r
 }
 
+define float @fmul_poison_op1(float %x) {
+; CHECK-LABEL: @fmul_poison_op1(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = fmul float %x, poison
+  ret float %r
+}
+
 define float @fdiv_undef_op0(float %x) {
 ; CHECK-LABEL: @fdiv_undef_op0(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -57,6 +107,14 @@ define float @fdiv_undef_op0(float %x) {
   ret float %r
 }
 
+define float @fdiv_poison_op0(float %x) {
+; CHECK-LABEL: @fdiv_poison_op0(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = fdiv float poison, %x
+  ret float %r
+}
+
 define float @fdiv_undef_op1(float %x) {
 ; CHECK-LABEL: @fdiv_undef_op1(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -65,6 +123,14 @@ define float @fdiv_undef_op1(float %x) {
   ret float %r
 }
 
+define float @fdiv_poison_op1(float %x) {
+; CHECK-LABEL: @fdiv_poison_op1(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = fdiv float %x, poison
+  ret float %r
+}
+
 define float @frem_undef_op0(float %x) {
 ; CHECK-LABEL: @frem_undef_op0(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -73,6 +139,14 @@ define float @frem_undef_op0(float %x) {
   ret float %r
 }
 
+define float @frem_poison_op0(float %x) {
+; CHECK-LABEL: @frem_poison_op0(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = frem float poison, %x
+  ret float %r
+}
+
 define float @frem_undef_op1(float %x) {
 ; CHECK-LABEL: @frem_undef_op1(
 ; CHECK-NEXT:    ret float 0x7FF8000000000000
@@ -81,6 +155,14 @@ define float @frem_undef_op1(float %x) {
   ret float %r
 }
 
+define float @frem_poison_op1(float %x) {
+; CHECK-LABEL: @frem_poison_op1(
+; CHECK-NEXT:    ret float 0x7FF8000000000000
+;
+  %r = frem float %x, poison
+  ret float %r
+}
+
 ; Repeat all tests with fast-math-flags. Alternate 'nnan' and 'fast' for more coverage.
 
 define float @fadd_undef_op0_nnan(float %x) {
diff --git a/llvm/test/Transforms/InstSimplify/gep.ll b/llvm/test/Transforms/InstSimplify/gep.ll
index 5044b50f7c9d..a0799090fc03 100644
--- a/llvm/test/Transforms/InstSimplify/gep.ll
+++ b/llvm/test/Transforms/InstSimplify/gep.ll
@@ -185,3 +185,13 @@ define <vscale x 2 x i64*> @ptr_idx_mix_scalar_scalable_vector() {
 }
 
 ; Check ConstantExpr::getGetElementPtr() using ElementCount for size queries - end.
+
+; TODO: this should return poison
+
+define i8* @poison() {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i8* undef
+;
+  %v = getelementptr i8, i8* poison, i64 1
+  ret i8* %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/icmp.ll b/llvm/test/Transforms/InstSimplify/icmp.ll
index c32699417881..9d03dc9cbeaf 100644
--- a/llvm/test/Transforms/InstSimplify/icmp.ll
+++ b/llvm/test/Transforms/InstSimplify/icmp.ll
@@ -8,8 +8,31 @@ declare void @usei8ptr(i8* %ptr)
 ; Ensure that we do not crash when looking at such a weird bitcast.
 define i1 @bitcast_from_single_element_pointer_vector_to_pointer(<1 x i8*> %ptr1vec, i8* %ptr2) {
 ; CHECK-LABEL: @bitcast_from_single_element_pointer_vector_to_pointer(
+; CHECK-NEXT:    [[PTR1:%.*]] = bitcast <1 x i8*> [[PTR1VEC:%.*]] to i8*
+; CHECK-NEXT:    call void @usei8ptr(i8* [[PTR1]])
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8* [[PTR1]], [[PTR2:%.*]]
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
   %ptr1 = bitcast <1 x i8*> %ptr1vec to i8*
   call void @usei8ptr(i8* %ptr1)
   %cmp = icmp eq i8* %ptr1, %ptr2
   ret i1 %cmp
 }
+
+; TODO: these should return poison
+
+define i1 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i1 undef
+;
+  %v = icmp eq i32 %x, poison
+  ret i1 %v
+}
+
+define i1 @poison2(i32 %x) {
+; CHECK-LABEL: @poison2(
+; CHECK-NEXT:    ret i1 false
+;
+  %v = icmp slt i32 %x, poison
+  ret i1 %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/insertelement.ll b/llvm/test/Transforms/InstSimplify/insertelement.ll
index c0c91b26f7a3..6594507c1aad 100644
--- a/llvm/test/Transforms/InstSimplify/insertelement.ll
+++ b/llvm/test/Transforms/InstSimplify/insertelement.ll
@@ -42,6 +42,23 @@ define <4 x i32> @test5(<4 x i32> %A) {
   ret <4 x i32> %I
 }
 
+define <4 x i32> @test5_poison(<4 x i32> %A) {
+; CHECK-LABEL: @test5_poison(
+; CHECK-NEXT:    ret <4 x i32> undef
+;
+  %I = insertelement <4 x i32> %A, i32 5, i64 poison
+  ret <4 x i32> %I
+}
+
+define <4 x i32> @elem_poison(<4 x i32> %A) {
+; CHECK-LABEL: @elem_poison(
+; CHECK-NEXT:    [[B:%.*]] = insertelement <4 x i32> [[A:%.*]], i32 poison, i32 1
+; CHECK-NEXT:    ret <4 x i32> [[B]]
+;
+  %B = insertelement <4 x i32> %A, i32 poison, i32 1
+  ret <4 x i32> %B
+}
+
 ; The undef may be replacing a poison value, so it is not safe to just return 'A'.
 
 define <4 x i32> @PR1286(<4 x i32> %A) {
diff --git a/llvm/test/Transforms/InstSimplify/insertvalue.ll b/llvm/test/Transforms/InstSimplify/insertvalue.ll
new file mode 100644
index 000000000000..afc7f36acfe0
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/insertvalue.ll
@@ -0,0 +1,19 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+define {i32, i32} @poison({i32, i32} %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret { i32, i32 } [[X:%.*]]
+;
+  %v = insertvalue {i32, i32} %x, i32 poison, 0
+  ret {i32, i32} %v
+}
+
+define {i32, i32} @poison2({i32, i32} %x) {
+; CHECK-LABEL: @poison2(
+; CHECK-NEXT:    ret { i32, i32 } [[X:%.*]]
+;
+  %elem = extractvalue {i32, i32} %x, 0
+  %v = insertvalue {i32, i32} poison, i32 %elem, 0
+  ret {i32, i32} %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/maxmin_intrinsics.ll b/llvm/test/Transforms/InstSimplify/maxmin_intrinsics.ll
index d646334887b2..184b79f2adf0 100644
--- a/llvm/test/Transforms/InstSimplify/maxmin_intrinsics.ll
+++ b/llvm/test/Transforms/InstSimplify/maxmin_intrinsics.ll
@@ -1,6 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instsimplify -S | FileCheck %s
 
+; TODO: the instructions with poison operands should return poison
+
 declare i81 @llvm.smax.i81(i81, i81)
 declare i8 @llvm.smax.i8(i8, i8)
 declare <2 x i8> @llvm.smax.v2i8(<2 x i8>, <2 x i8>)
@@ -53,6 +55,14 @@ define i81 @smax_undef(i81 %x) {
   ret i81 %r
 }
 
+define i81 @smax_poison(i81 %x) {
+; CHECK-LABEL: @smax_poison(
+; CHECK-NEXT:    ret i81 1208925819614629174706175
+;
+  %r = call i81 @llvm.smax.i81(i81 poison, i81 %x)
+  ret i81 %r
+}
+
 define i3 @smin_undef(i3 %x) {
 ; CHECK-LABEL: @smin_undef(
 ; CHECK-NEXT:    ret i3 -4
@@ -61,6 +71,14 @@ define i3 @smin_undef(i3 %x) {
   ret i3 %r
 }
 
+define i3 @smin_poison(i3 %x) {
+; CHECK-LABEL: @smin_poison(
+; CHECK-NEXT:    ret i3 -4
+;
+  %r = call i3 @llvm.smin.i3(i3 %x, i3 poison)
+  ret i3 %r
+}
+
 define <2 x i8> @umax_undef(<2 x i8> %x) {
 ; CHECK-LABEL: @umax_undef(
 ; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
@@ -69,6 +87,14 @@ define <2 x i8> @umax_undef(<2 x i8> %x) {
   ret <2 x i8> %r
 }
 
+define <2 x i8> @umax_poison(<2 x i8> %x) {
+; CHECK-LABEL: @umax_poison(
+; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
+;
+  %r = call <2 x i8> @llvm.umax.v2i8(<2 x i8> poison, <2 x i8> %x)
+  ret <2 x i8> %r
+}
+
 define <2 x i8> @umin_undef(<2 x i8> %x) {
 ; CHECK-LABEL: @umin_undef(
 ; CHECK-NEXT:    ret <2 x i8> zeroinitializer
@@ -77,6 +103,14 @@ define <2 x i8> @umin_undef(<2 x i8> %x) {
   ret <2 x i8> %r
 }
 
+define <2 x i8> @umin_poison(<2 x i8> %x) {
+; CHECK-LABEL: @umin_poison(
+; CHECK-NEXT:    ret <2 x i8> zeroinitializer
+;
+  %r = call <2 x i8> @llvm.umin.v2i8(<2 x i8> %x, <2 x i8> poison)
+  ret <2 x i8> %r
+}
+
 define i8 @smax_maxval(i8 %x) {
 ; CHECK-LABEL: @smax_maxval(
 ; CHECK-NEXT:    ret i8 127
diff --git a/llvm/test/Transforms/InstSimplify/mul.ll b/llvm/test/Transforms/InstSimplify/mul.ll
index 71410cd0ca32..26b4269dea44 100644
--- a/llvm/test/Transforms/InstSimplify/mul.ll
+++ b/llvm/test/Transforms/InstSimplify/mul.ll
@@ -42,3 +42,12 @@ define <2 x i8> @mul_by_0_vec_undef_elt(<2 x i8> %a) {
   ret <2 x i8> %b
 }
 
+; TODO: this should be poison
+
+define i32 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 0
+;
+  %v = mul i32 %x, poison
+  ret i32 %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/or.ll b/llvm/test/Transforms/InstSimplify/or.ll
index e4c4153d62b2..e8284264c612 100644
--- a/llvm/test/Transforms/InstSimplify/or.ll
+++ b/llvm/test/Transforms/InstSimplify/or.ll
@@ -291,3 +291,13 @@ define <2 x i1> @or_with_not_op_commute4(<2 x i1> %a, <2 x i1> %b) {
   %r = or <2 x i1> %not, %a
   ret <2 x i1> %r
 }
+
+; TODO: this should be poison
+
+define i32 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 -1
+;
+  %v = or i32 %x, poison
+  ret i32 %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/phi.ll b/llvm/test/Transforms/InstSimplify/phi.ll
index 242b7ab87bfb..2861cca64ffe 100644
--- a/llvm/test/Transforms/InstSimplify/phi.ll
+++ b/llvm/test/Transforms/InstSimplify/phi.ll
@@ -52,3 +52,23 @@ end:
   %counter.lcssa = phi i32 [ %x, %entry ]
   ret i32 %counter.lcssa
 }
+
+define i32 @poison(i1 %cond, i32 %v) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
+; CHECK:       A:
+; CHECK-NEXT:    br label [[EXIT:%.*]]
+; CHECK:       B:
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       EXIT:
+; CHECK-NEXT:    ret i32 [[V:%.*]]
+;
+  br i1 %cond, label %A, label %B
+A:
+  br label %EXIT
+B:
+  br label %EXIT
+EXIT:
+  %w = phi i32 [%v, %A], [poison, %B]
+  ret i32 %w
+}
diff --git a/llvm/test/Transforms/InstSimplify/rem.ll b/llvm/test/Transforms/InstSimplify/rem.ll
index 67ad0c636513..74b5ea7bfdc7 100644
--- a/llvm/test/Transforms/InstSimplify/rem.ll
+++ b/llvm/test/Transforms/InstSimplify/rem.ll
@@ -236,7 +236,7 @@ declare i32 @external()
 
 define i32 @rem4() {
 ; CHECK-LABEL: @rem4(
-; CHECK-NEXT:    [[CALL:%.*]] = call i32 @external(), !range !0
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @external(), [[RNG0:!range !.*]]
 ; CHECK-NEXT:    ret i32 [[CALL]]
 ;
   %call = call i32 @external(), !range !0
@@ -327,8 +327,27 @@ define <2 x i32> @srem_with_sext_bool_divisor_vec(<2 x i1> %x, <2 x i32> %y) {
 }
 
 define i8 @srem_minusone_divisor() {
-; CHECK-LABEL: @srem_minusone_divisor
-; CHECK-NEXT:   ret i8 poison
+; CHECK-LABEL: @srem_minusone_divisor(
+; CHECK-NEXT:    ret i8 poison
+;
   %v = srem i8 -128, -1
   ret i8 %v
 }
+
+define i32 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 poison
+;
+  %v = urem i32 %x, poison
+  ret i32 %v
+}
+
+; TODO: this should be poison
+
+define i32 @poison2(i32 %x) {
+; CHECK-LABEL: @poison2(
+; CHECK-NEXT:    ret i32 0
+;
+  %v = urem i32 poison, %x
+  ret i32 %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/saturating-add-sub.ll b/llvm/test/Transforms/InstSimplify/saturating-add-sub.ll
index a226cc456ac5..2c3bbe9e9246 100644
--- a/llvm/test/Transforms/InstSimplify/saturating-add-sub.ll
+++ b/llvm/test/Transforms/InstSimplify/saturating-add-sub.ll
@@ -1,6 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instsimplify -S | FileCheck %s
 
+; TODO: the instructions having poison operands should be folded to poison
+
 declare i3 @llvm.uadd.sat.i3(i3, i3)
 declare i8 @llvm.uadd.sat.i8(i8, i8)
 declare <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8>, <2 x i8>)
@@ -86,6 +88,14 @@ define i8 @uadd_scalar_undef(i8 %a) {
   ret i8 %x5
 }
 
+define i8 @uadd_scalar_poison(i8 %a) {
+; CHECK-LABEL: @uadd_scalar_poison(
+; CHECK-NEXT:    ret i8 -1
+;
+  %x5 = call i8 @llvm.uadd.sat.i8(i8 %a, i8 poison)
+  ret i8 %x5
+}
+
 define <2 x i8> @uadd_vector_undef(<2 x i8> %a) {
 ; CHECK-LABEL: @uadd_vector_undef(
 ; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
@@ -94,6 +104,14 @@ define <2 x i8> @uadd_vector_undef(<2 x i8> %a) {
   ret <2 x i8> %x5v
 }
 
+define <2 x i8> @uadd_vector_poison(<2 x i8> %a) {
+; CHECK-LABEL: @uadd_vector_poison(
+; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
+;
+  %x5v = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 poison, i8 poison>)
+  ret <2 x i8> %x5v
+}
+
 define i8 @uadd_scalar_undef_commute(i8 %a) {
 ; CHECK-LABEL: @uadd_scalar_undef_commute(
 ; CHECK-NEXT:    ret i8 -1
@@ -102,6 +120,14 @@ define i8 @uadd_scalar_undef_commute(i8 %a) {
   ret i8 %x6
 }
 
+define i8 @uadd_scalar_poison_commute(i8 %a) {
+; CHECK-LABEL: @uadd_scalar_poison_commute(
+; CHECK-NEXT:    ret i8 -1
+;
+  %x6 = call i8 @llvm.uadd.sat.i8(i8 poison, i8 %a)
+  ret i8 %x6
+}
+
 define <2 x i8> @uadd_vector_undef_commute(<2 x i8> %a) {
 ; CHECK-LABEL: @uadd_vector_undef_commute(
 ; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
@@ -110,6 +136,14 @@ define <2 x i8> @uadd_vector_undef_commute(<2 x i8> %a) {
   ret <2 x i8> %x5v
 }
 
+define <2 x i8> @uadd_vector_poison_commute(<2 x i8> %a) {
+; CHECK-LABEL: @uadd_vector_poison_commute(
+; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
+;
+  %x5v = call <2 x i8> @llvm.uadd.sat.v2i8(<2 x i8> poison, <2 x i8> %a)
+  ret <2 x i8> %x5v
+}
+
 define i8 @sadd_scalar_0(i8 %a) {
 ; CHECK-LABEL: @sadd_scalar_0(
 ; CHECK-NEXT:    ret i8 [[A:%.*]]
@@ -186,6 +220,14 @@ define i8 @sadd_scalar_undef(i8 %a) {
   ret i8 %y5
 }
 
+define i8 @sadd_scalar_poison(i8 %a) {
+; CHECK-LABEL: @sadd_scalar_poison(
+; CHECK-NEXT:    ret i8 -1
+;
+  %y5 = call i8 @llvm.sadd.sat.i8(i8 %a, i8 poison)
+  ret i8 %y5
+}
+
 define <2 x i8> @sadd_vector_undef(<2 x i8> %a) {
 ; CHECK-LABEL: @sadd_vector_undef(
 ; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
@@ -194,6 +236,14 @@ define <2 x i8> @sadd_vector_undef(<2 x i8> %a) {
   ret <2 x i8> %y5v
 }
 
+define <2 x i8> @sadd_vector_poison(<2 x i8> %a) {
+; CHECK-LABEL: @sadd_vector_poison(
+; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
+;
+  %y5v = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> %a, <2 x i8> poison)
+  ret <2 x i8> %y5v
+}
+
 define i8 @sadd_scalar_undef_commute(i8 %a) {
 ; CHECK-LABEL: @sadd_scalar_undef_commute(
 ; CHECK-NEXT:    ret i8 -1
@@ -202,6 +252,14 @@ define i8 @sadd_scalar_undef_commute(i8 %a) {
   ret i8 %y6
 }
 
+define i8 @sadd_scalar_poison_commute(i8 %a) {
+; CHECK-LABEL: @sadd_scalar_poison_commute(
+; CHECK-NEXT:    ret i8 -1
+;
+  %y6 = call i8 @llvm.sadd.sat.i8(i8 poison, i8 %a)
+  ret i8 %y6
+}
+
 define <2 x i8> @sadd_vector_undef_commute(<2 x i8> %a) {
 ; CHECK-LABEL: @sadd_vector_undef_commute(
 ; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
@@ -210,6 +268,14 @@ define <2 x i8> @sadd_vector_undef_commute(<2 x i8> %a) {
   ret <2 x i8> %y6v
 }
 
+define <2 x i8> @sadd_vector_poison_commute(<2 x i8> %a) {
+; CHECK-LABEL: @sadd_vector_poison_commute(
+; CHECK-NEXT:    ret <2 x i8> <i8 -1, i8 -1>
+;
+  %y6v = call <2 x i8> @llvm.sadd.sat.v2i8(<2 x i8> poison, <2 x i8> %a)
+  ret <2 x i8> %y6v
+}
+
 define i8 @usub_scalar_0(i8 %a) {
 ; CHECK-LABEL: @usub_scalar_0(
 ; CHECK-NEXT:    ret i8 [[A:%.*]]
@@ -266,6 +332,14 @@ define i8 @usub_scalar_undef(i8 %a) {
   ret i8 %x4
 }
 
+define i8 @usub_scalar_poison(i8 %a) {
+; CHECK-LABEL: @usub_scalar_poison(
+; CHECK-NEXT:    ret i8 0
+;
+  %x4 = call i8 @llvm.usub.sat.i8(i8 %a, i8 poison)
+  ret i8 %x4
+}
+
 define <2 x i8> @usub_vector_undef(<2 x i8> %a) {
 ; CHECK-LABEL: @usub_vector_undef(
 ; CHECK-NEXT:    ret <2 x i8> zeroinitializer
@@ -274,6 +348,14 @@ define <2 x i8> @usub_vector_undef(<2 x i8> %a) {
   ret <2 x i8> %x4v
 }
 
+define <2 x i8> @usub_vector_poison(<2 x i8> %a) {
+; CHECK-LABEL: @usub_vector_poison(
+; CHECK-NEXT:    ret <2 x i8> zeroinitializer
+;
+  %x4v = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> %a, <2 x i8> <i8 poison, i8 poison>)
+  ret <2 x i8> %x4v
+}
+
 define i8 @usub_scalar_undef_commute(i8 %a) {
 ; CHECK-LABEL: @usub_scalar_undef_commute(
 ; CHECK-NEXT:    ret i8 0
@@ -282,6 +364,14 @@ define i8 @usub_scalar_undef_commute(i8 %a) {
   ret i8 %x5
 }
 
+define i8 @usub_scalar_poison_commute(i8 %a) {
+; CHECK-LABEL: @usub_scalar_poison_commute(
+; CHECK-NEXT:    ret i8 0
+;
+  %x5 = call i8 @llvm.usub.sat.i8(i8 poison, i8 %a)
+  ret i8 %x5
+}
+
 define <2 x i8> @usub_vector_undef_commute(<2 x i8> %a) {
 ; CHECK-LABEL: @usub_vector_undef_commute(
 ; CHECK-NEXT:    ret <2 x i8> zeroinitializer
@@ -290,6 +380,14 @@ define <2 x i8> @usub_vector_undef_commute(<2 x i8> %a) {
   ret <2 x i8> %x5v
 }
 
+define <2 x i8> @usub_vector_poison_commute(<2 x i8> %a) {
+; CHECK-LABEL: @usub_vector_poison_commute(
+; CHECK-NEXT:    ret <2 x i8> zeroinitializer
+;
+  %x5v = call <2 x i8> @llvm.usub.sat.v2i8(<2 x i8> <i8 poison, i8 poison>, <2 x i8> %a)
+  ret <2 x i8> %x5v
+}
+
 define i8 @usub_scalar_same(i8 %a) {
 ; CHECK-LABEL: @usub_scalar_same(
 ; CHECK-NEXT:    ret i8 0
@@ -366,6 +464,14 @@ define i8 @ssub_scalar_undef(i8 %a) {
   ret i8 %y4
 }
 
+define i8 @ssub_scalar_poison(i8 %a) {
+; CHECK-LABEL: @ssub_scalar_poison(
+; CHECK-NEXT:    ret i8 0
+;
+  %y4 = call i8 @llvm.ssub.sat.i8(i8 %a, i8 poison)
+  ret i8 %y4
+}
+
 define <2 x i8> @ssub_vector_undef(<2 x i8> %a) {
 ; CHECK-LABEL: @ssub_vector_undef(
 ; CHECK-NEXT:    ret <2 x i8> zeroinitializer
@@ -374,6 +480,14 @@ define <2 x i8> @ssub_vector_undef(<2 x i8> %a) {
   ret <2 x i8> %y4v
 }
 
+define <2 x i8> @ssub_vector_poison(<2 x i8> %a) {
+; CHECK-LABEL: @ssub_vector_poison(
+; CHECK-NEXT:    ret <2 x i8> zeroinitializer
+;
+  %y4v = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> %a, <2 x i8> poison)
+  ret <2 x i8> %y4v
+}
+
 define i8 @ssub_scalar_undef_commute(i8 %a) {
 ; CHECK-LABEL: @ssub_scalar_undef_commute(
 ; CHECK-NEXT:    ret i8 0
@@ -382,6 +496,14 @@ define i8 @ssub_scalar_undef_commute(i8 %a) {
   ret i8 %y5
 }
 
+define i8 @ssub_scalar_poison_commute(i8 %a) {
+; CHECK-LABEL: @ssub_scalar_poison_commute(
+; CHECK-NEXT:    ret i8 0
+;
+  %y5 = call i8 @llvm.ssub.sat.i8(i8 poison, i8 %a)
+  ret i8 %y5
+}
+
 define <2 x i8> @ssub_vector_undef_commute(<2 x i8> %a) {
 ; CHECK-LABEL: @ssub_vector_undef_commute(
 ; CHECK-NEXT:    ret <2 x i8> zeroinitializer
@@ -390,6 +512,14 @@ define <2 x i8> @ssub_vector_undef_commute(<2 x i8> %a) {
   ret <2 x i8> %y5v
 }
 
+define <2 x i8> @ssub_vector_poison_commute(<2 x i8> %a) {
+; CHECK-LABEL: @ssub_vector_poison_commute(
+; CHECK-NEXT:    ret <2 x i8> zeroinitializer
+;
+  %y5v = call <2 x i8> @llvm.ssub.sat.v2i8(<2 x i8> <i8 poison, i8 poison>, <2 x i8> %a)
+  ret <2 x i8> %y5v
+}
+
 define i8 @ssub_scalar_same(i8 %a) {
 ; CHECK-LABEL: @ssub_scalar_same(
 ; CHECK-NEXT:    ret i8 0
diff --git a/llvm/test/Transforms/InstSimplify/select.ll b/llvm/test/Transforms/InstSimplify/select.ll
index 4cbc5832d234..6460b42d63c1 100644
--- a/llvm/test/Transforms/InstSimplify/select.ll
+++ b/llvm/test/Transforms/InstSimplify/select.ll
@@ -968,3 +968,40 @@ define <vscale x 2 x i1> @ignore_scalable_undef(<vscale x 2 x i1> %cond) {
   %s = select <vscale x 2 x i1> %cond, <vscale x 2 x i1> undef, <vscale x 2 x i1> %vec
   ret <vscale x 2 x i1> %s
 }
+
+; TODO: these can be optimized more
+
+define i32 @poison(i32 %x, i32 %y) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 [[X:%.*]]
+;
+  %v = select i1 undef, i32 %x, i32 %y
+  ret i32 %v
+}
+
+define i32 @poison2(i1 %cond, i32 %x) {
+; CHECK-LABEL: @poison2(
+; CHECK-NEXT:    [[V:%.*]] = select i1 [[COND:%.*]], i32 poison, i32 [[X:%.*]]
+; CHECK-NEXT:    ret i32 [[V]]
+;
+  %v = select i1 %cond, i32 poison, i32 %x
+  ret i32 %v
+}
+
+define i32 @poison3(i1 %cond, i32 %x) {
+; CHECK-LABEL: @poison3(
+; CHECK-NEXT:    [[V:%.*]] = select i1 [[COND:%.*]], i32 [[X:%.*]], i32 poison
+; CHECK-NEXT:    ret i32 [[V]]
+;
+  %v = select i1 %cond, i32 %x, i32 poison
+  ret i32 %v
+}
+
+define <2 x i32> @poison4(<2 x i1> %cond, <2 x i32> %x) {
+; CHECK-LABEL: @poison4(
+; CHECK-NEXT:    [[V:%.*]] = select <2 x i1> [[COND:%.*]], <2 x i32> [[X:%.*]], <2 x i32> poison
+; CHECK-NEXT:    ret <2 x i32> [[V]]
+;
+  %v = select <2 x i1> %cond, <2 x i32> %x, <2 x i32> poison
+  ret <2 x i32> %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/shift.ll b/llvm/test/Transforms/InstSimplify/shift.ll
index cbffd371853b..87b14e1af568 100644
--- a/llvm/test/Transforms/InstSimplify/shift.ll
+++ b/llvm/test/Transforms/InstSimplify/shift.ll
@@ -237,3 +237,53 @@ define <2 x i64> @shl_or_shr2v(<2 x i32> %a, <2 x i32> %b) {
   %tmp5 = lshr <2 x i64> %tmp4, <i64 31, i64 31>
   ret <2 x i64> %tmp5
 }
+
+; TOOD: these should be poison
+
+define i32 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 undef
+;
+  %v = lshr i32 %x, poison
+  ret i32 %v
+}
+
+define i32 @poison2(i32 %x) {
+; CHECK-LABEL: @poison2(
+; CHECK-NEXT:    ret i32 undef
+;
+  %v = ashr i32 %x, poison
+  ret i32 %v
+}
+
+define i32 @poison3(i32 %x) {
+; CHECK-LABEL: @poison3(
+; CHECK-NEXT:    ret i32 undef
+;
+  %v = shl i32 %x, poison
+  ret i32 %v
+}
+
+define i32 @poison4(i32 %x) {
+; CHECK-LABEL: @poison4(
+; CHECK-NEXT:    ret i32 0
+;
+  %v = lshr i32 poison, %x
+  ret i32 %v
+}
+
+define i32 @poison5(i32 %x) {
+; CHECK-LABEL: @poison5(
+; CHECK-NEXT:    ret i32 0
+;
+  %v = ashr i32 poison, %x
+  ret i32 %v
+}
+
+define i32 @poison6(i32 %x) {
+; CHECK-LABEL: @poison6(
+; CHECK-NEXT:    ret i32 0
+;
+  %v = shl i32 poison, %x
+  ret i32 %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/shufflevector.ll b/llvm/test/Transforms/InstSimplify/shufflevector.ll
index 14c4205f444b..01b080ff88e6 100644
--- a/llvm/test/Transforms/InstSimplify/shufflevector.ll
+++ b/llvm/test/Transforms/InstSimplify/shufflevector.ll
@@ -36,6 +36,16 @@ define <4 x i32> @splat_operand(<4 x i32> %x) {
   ret <4 x i32> %shuf
 }
 
+define <4 x i32> @splat_operand_poison(<4 x i32> %x) {
+; CHECK-LABEL: @splat_operand_poison(
+; CHECK-NEXT:    [[SPLAT:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <4 x i32> zeroinitializer
+; CHECK-NEXT:    ret <4 x i32> [[SPLAT]]
+;
+  %splat = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> zeroinitializer
+  %shuf = shufflevector <4 x i32> %splat, <4 x i32> poison, <4 x i32> <i32 0, i32 3, i32 2, i32 1>
+  ret <4 x i32> %shuf
+}
+
 define <4 x i32> @splat_operand1(<4 x i32> %x, <4 x i32> %y) {
 ; CHECK-LABEL: @splat_operand1(
 ; CHECK-NEXT:    [[SPLAT:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> [[Y:%.*]], <4 x i32> zeroinitializer
diff --git a/llvm/test/Transforms/InstSimplify/sub.ll b/llvm/test/Transforms/InstSimplify/sub.ll
index 4e2064527c41..dbc1c6cea4d3 100644
--- a/llvm/test/Transforms/InstSimplify/sub.ll
+++ b/llvm/test/Transforms/InstSimplify/sub.ll
@@ -51,3 +51,20 @@ define <2 x i32> @neg_neg_vec(<2 x i32> %A) {
   ret <2 x i32> %C
 }
 
+; TODO: these should be poison
+
+define i32 @poison1(i32 %x) {
+; CHECK-LABEL: @poison1(
+; CHECK-NEXT:    ret i32 undef
+;
+  %v = sub i32 %x, poison
+  ret i32 %v
+}
+
+define i32 @poison2(i32 %x) {
+; CHECK-LABEL: @poison2(
+; CHECK-NEXT:    ret i32 undef
+;
+  %v = sub i32 poison, %x
+  ret i32 %v
+}
diff --git a/llvm/test/Transforms/InstSimplify/xor.ll b/llvm/test/Transforms/InstSimplify/xor.ll
new file mode 100644
index 000000000000..322d94851ce1
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/xor.ll
@@ -0,0 +1,10 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+define i32 @poison(i32 %x) {
+; CHECK-LABEL: @poison(
+; CHECK-NEXT:    ret i32 poison
+;
+  %v = xor i32 %x, poison
+  ret i32 %v
+}