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* [gcc r14-3319] tree-optimization/111048 - avoid flawed logic in fold_vec_perm
@ 2023-08-18 8:24 Richard Biener
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From: Richard Biener @ 2023-08-18 8:24 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:f5f47cc1ce75b00427756939a2dab94d3d125f6a
commit r14-3319-gf5f47cc1ce75b00427756939a2dab94d3d125f6a
Author: Richard Biener <rguenther@suse.de>
Date: Fri Aug 18 09:41:56 2023 +0200
tree-optimization/111048 - avoid flawed logic in fold_vec_perm
The following avoids running into somehow flawed logic in fold_vec_perm
for non-VLA vectors.
PR tree-optimization/111048
* fold-const.cc (fold_vec_perm_cst): Check for non-VLA
vectors first.
* gcc.dg/torture/pr111048.c: New testcase.
Diff:
---
gcc/fold-const.cc | 12 ++++++------
gcc/testsuite/gcc.dg/torture/pr111048.c | 24 ++++++++++++++++++++++++
2 files changed, 30 insertions(+), 6 deletions(-)
diff --git a/gcc/fold-const.cc b/gcc/fold-const.cc
index c6fb083027db..08530b6ae809 100644
--- a/gcc/fold-const.cc
+++ b/gcc/fold-const.cc
@@ -10625,6 +10625,11 @@ fold_vec_perm_cst (tree type, tree arg0, tree arg1, const vec_perm_indices &sel,
unsigned res_npatterns, res_nelts_per_pattern;
unsigned HOST_WIDE_INT res_nelts;
+ if (TYPE_VECTOR_SUBPARTS (type).is_constant (&res_nelts))
+ {
+ res_npatterns = res_nelts;
+ res_nelts_per_pattern = 1;
+ }
/* (1) If SEL is a suitable mask as determined by
valid_mask_for_fold_vec_perm_cst_p, then:
res_npatterns = max of npatterns between ARG0, ARG1, and SEL
@@ -10634,7 +10639,7 @@ fold_vec_perm_cst (tree type, tree arg0, tree arg1, const vec_perm_indices &sel,
res_npatterns = nelts in result vector.
res_nelts_per_pattern = 1.
This exception is made so that VLS ARG0, ARG1 and SEL work as before. */
- if (valid_mask_for_fold_vec_perm_cst_p (arg0, arg1, sel, reason))
+ else if (valid_mask_for_fold_vec_perm_cst_p (arg0, arg1, sel, reason))
{
res_npatterns
= std::max (VECTOR_CST_NPATTERNS (arg0),
@@ -10648,11 +10653,6 @@ fold_vec_perm_cst (tree type, tree arg0, tree arg1, const vec_perm_indices &sel,
res_nelts = res_npatterns * res_nelts_per_pattern;
}
- else if (TYPE_VECTOR_SUBPARTS (type).is_constant (&res_nelts))
- {
- res_npatterns = res_nelts;
- res_nelts_per_pattern = 1;
- }
else
return NULL_TREE;
diff --git a/gcc/testsuite/gcc.dg/torture/pr111048.c b/gcc/testsuite/gcc.dg/torture/pr111048.c
new file mode 100644
index 000000000000..475978aae2be
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr111048.c
@@ -0,0 +1,24 @@
+/* { dg-do run } */
+/* { dg-additional-options "-mavx2" { target avx2_runtime } } */
+
+typedef unsigned char u8;
+
+__attribute__((noipa))
+static void check(const u8 * v) {
+ if (*v != 15) __builtin_trap();
+}
+
+__attribute__((noipa))
+static void bug(void) {
+ u8 in_lanes[32];
+ for (unsigned i = 0; i < 32; i += 2) {
+ in_lanes[i + 0] = 0;
+ in_lanes[i + 1] = ((u8)0xff) >> (i & 7);
+ }
+
+ check(&in_lanes[13]);
+ }
+
+int main() {
+ bug();
+}
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