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* [gcc/devel/c++-modules] tree-optimization/94163 constrain alignment set by PRE
@ 2020-03-19 12:42 Nathan Sidwell
0 siblings, 0 replies; only message in thread
From: Nathan Sidwell @ 2020-03-19 12:42 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:3604480a6fe493c51d6ebd53d9b1abeebbbb828f
commit 3604480a6fe493c51d6ebd53d9b1abeebbbb828f
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 679296ffcac..18745fb6a15 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.
+
2020-03-13 Martin Liska <mliska@suse.cz>
PR lto/94157
diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c
index 29987d840fd..0c1654f3580 100644
--- a/gcc/tree-ssa-pre.c
+++ b/gcc/tree-ssa-pre.c
@@ -2815,7 +2815,8 @@ 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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