The following fixes a mistake in looking up an extended operand
in the CSE of a truncated operation.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
2022-06-28 Richard Biener <rguent...@suse.de>
PR tree-optimization/106112
* tree-ssa-sccvn.cc (valueized_wider_op): Properly extend
a constant operand according to its type.
* gcc.dg/torture/pr106112.c: New testcase.
---
gcc/testsuite/gcc.dg/torture/pr106112.c | 16 ++++++++++++++++
gcc/tree-ssa-sccvn.cc | 2 +-
2 files changed, 17 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/torture/pr106112.c
diff --git a/gcc/testsuite/gcc.dg/torture/pr106112.c
b/gcc/testsuite/gcc.dg/torture/pr106112.c
new file mode 100644
index 00000000000..bd7f63c0935
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr106112.c
@@ -0,0 +1,16 @@
+/* { dg-do run } */
+
+__INT32_TYPE__ a = 5, b, c, d;
+__UINT64_TYPE__ e = 20862985922;
+int main()
+{
+ __UINT32_TYPE__ f = 4294967292;
+ e = e | f;
+ c = -1 % ((~f ^ 4294967292) - (e - d));
+ b = ~-~e % ~-d;
+ if (b)
+ a = 0;
+ if (a < 1)
+ __builtin_abort();
+ return 0;
+}
diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 5214f142f52..9deedeac378 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -4983,7 +4983,7 @@ valueized_wider_op (tree wide_type, tree op, bool
allow_truncate)
/* For constants simply extend it. */
if (TREE_CODE (op) == INTEGER_CST)
- return wide_int_to_tree (wide_type, wi::to_wide (op));
+ return wide_int_to_tree (wide_type, wi::to_widest (op));
return NULL_TREE;
}
--
2.35.3
