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https://bugs.gentoo.org/750905
https://gcc.gnu.org/PR94163
From db3584552871c8caccdc22e97ea1573da9458253 Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Fri, 13 Mar 2020 13:56:26 +0100
Subject: [PATCH] tree-optimization/94163 constrain alignment set by PRE
This avoids HWI -> unsigned truncation to end up with zero alignment
which set_ptr_info_alignment ICEs on.
2020-03-13 Richard Biener <rguenther@suse.de>
PR tree-optimization/94163
* tree-ssa-pre.c (create_expression_by_pieces): Check
whether alignment would be zero.
--- a/gcc/tree-ssa-pre.c
+++ b/gcc/tree-ssa-pre.c
@@ -2810,7 +2810,8 @@ create_expression_by_pieces (basic_block block, pre_expr expr,
unsigned HOST_WIDE_INT hmisalign
= args.length () == 3 ? tree_to_uhwi (args[2]) : 0;
if ((halign & (halign - 1)) == 0
- && (hmisalign & ~(halign - 1)) == 0)
+ && (hmisalign & ~(halign - 1)) == 0
+ && (unsigned int)halign != 0)
set_ptr_info_alignment (get_ptr_info (forcedname),
halign, hmisalign);
}
--
2.29.2
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