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* [gcc r11-10629] tree-optimization/109491 - ICE in expressions_equal_p
@ 2023-04-17 10:44 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2023-04-17 10:44 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:bb400f9916beab1a650d59c73672ef48aaf71b11
commit r11-10629-gbb400f9916beab1a650d59c73672ef48aaf71b11
Author: Richard Biener <rguenther@suse.de>
Date: Thu Apr 13 14:09:30 2023 +0200
tree-optimization/109491 - ICE in expressions_equal_p
At some point I elided the NULL pointer check in expressions_equal_p
because it shouldn't be necessary not realizing that for example
TARGET_MEM_REF has optional operands we cannot substitute with
something non-NULL with the same semantics. The following does the
simple thing and restore the check removed in r11-4982.
PR tree-optimization/109491
* tree-ssa-sccvn.c (expressions_equal_p): Restore the
NULL operands test.
(cherry picked from commit a37783de23c067d6a26374ff29c014e49604035c)
Diff:
---
gcc/tree-ssa-sccvn.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c
index a4a66f22ff0..ec5d7cac7f8 100644
--- a/gcc/tree-ssa-sccvn.c
+++ b/gcc/tree-ssa-sccvn.c
@@ -5789,6 +5789,13 @@ expressions_equal_p (tree e1, tree e2)
if (e1 == VN_TOP || e2 == VN_TOP)
return true;
+ /* If only one of them is null, they cannot be equal. While in general
+ this should not happen for operations like TARGET_MEM_REF some
+ operands are optional and an identity value we could substitute
+ has differing semantics. */
+ if (!e1 || !e2)
+ return false;
+
/* SSA_NAME compare pointer equal. */
if (TREE_CODE (e1) == SSA_NAME || TREE_CODE (e2) == SSA_NAME)
return false;
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