[gcc r12-3758] Do not query SCEV in range_of_phi unless dominators are available.
Aldy Hernandez
aldyh@gcc.gnu.org
Tue Sep 21 16:56:23 GMT 2021
https://gcc.gnu.org/g:64b80b8819f9ea74712625bceb0ec4388e25f67d
commit r12-3758-g64b80b8819f9ea74712625bceb0ec4388e25f67d
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Tue Sep 21 08:28:28 2021 +0200
Do not query SCEV in range_of_phi unless dominators are available.
SCEV won't work without dominators and we can get called without
dominators from debug_ranger.
Another option would be to rename scev_initialized_p to something like
scev_available_p and move the check there. For now, this will do.
gcc/ChangeLog:
* gimple-range-fold.cc (fold_using_range::range_of_phi): Check
dom_info_available_p.
Diff:
---
gcc/gimple-range-fold.cc | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc
index 80cc5c0dc0c..770a6c9b4da 100644
--- a/gcc/gimple-range-fold.cc
+++ b/gcc/gimple-range-fold.cc
@@ -814,7 +814,9 @@ fold_using_range::range_of_phi (irange &r, gphi *phi, fur_source &src)
}
// If SCEV is available, query if this PHI has any knonwn values.
- if (scev_initialized_p () && !POINTER_TYPE_P (TREE_TYPE (phi_def)))
+ if (dom_info_available_p (CDI_DOMINATORS)
+ && scev_initialized_p ()
+ && !POINTER_TYPE_P (TREE_TYPE (phi_def)))
{
value_range loop_range;
class loop *l = loop_containing_stmt (phi);
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