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* [gcc(refs/vendors/redhat/heads/gcc-8-branch)] tree-optimization/94163 constrain alignment set by PRE
@ 2020-09-17 16:51 Jakub Jelinek
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From: Jakub Jelinek @ 2020-09-17 16:51 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:96757464c3d07e727767fe11d198c07151971135
commit 96757464c3d07e727767fe11d198c07151971135
Author: Richard Biener <rguenther@suse.de>
Date: Fri Mar 13 13:56:26 2020 +0100
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.
Diff:
---
gcc/ChangeLog | 6 ++++++
gcc/tree-ssa-pre.c | 3 ++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 45670c3e20d..2f80eff858a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+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.
+
2019-03-13 Eric Botcazou <ebotcazou@adacore.com>
PR rtl-optimization/94119
diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c
index 5f9dc50eef6..7f7e4173302 100644
--- a/gcc/tree-ssa-pre.c
+++ b/gcc/tree-ssa-pre.c
@@ -2797,7 +2797,8 @@ 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);
}
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