This avoids HWI -> unsigned truncation to end up with zero alignment
which set_ptr_info_alignment ICEs on.
Bootstrap and regtest in progress.
Richard.
2020-03-13 Richard Biener <rguent...@suse.de>
PR tree-optimization/94163
* tree-ssa-pre.c (create_expression_by_pieces): Check
whether alignment would be zero.
---
gcc/tree-ssa-pre.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c
index 8bd17b82368..7b171bc4e8f 100644
--- 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);
}
--
2.16.4
