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* [gcc r13-517] Clamp vec_perm_expr index in simplify_bitfield_ref to avoid ICE.
@ 2022-05-17 0:59 hongtao Liu
0 siblings, 0 replies; only message in thread
From: hongtao Liu @ 2022-05-17 0:59 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1fba0608d12a209a5d76d65bcb1dec1c07bc33e9
commit r13-517-g1fba0608d12a209a5d76d65bcb1dec1c07bc33e9
Author: liuhongt <hongtao.liu@intel.com>
Date: Mon May 16 09:06:04 2022 +0800
Clamp vec_perm_expr index in simplify_bitfield_ref to avoid ICE.
gcc/ChangeLog:
PR tree-optimization/105591
* tree-ssa-forwprop.cc (simplify_bitfield_ref): Clamp
vec_perm_expr index.
gcc/testsuite/ChangeLog:
* gcc.dg/pr105591.c: New test.
Diff:
---
gcc/testsuite/gcc.dg/pr105591.c | 12 ++++++++++++
gcc/tree-ssa-forwprop.cc | 13 ++++++++-----
2 files changed, 20 insertions(+), 5 deletions(-)
diff --git a/gcc/testsuite/gcc.dg/pr105591.c b/gcc/testsuite/gcc.dg/pr105591.c
new file mode 100644
index 00000000000..9554c42e2f4
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr105591.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-Wno-psabi -O" } */
+/* { dg-additional-options "-mavx" { target x86_64-*-* i?86-*-* } } */
+typedef unsigned long long __attribute__((__vector_size__ (16))) U;
+typedef unsigned long long __attribute__((__vector_size__ (32))) V;
+
+V
+foo (U u)
+{
+ U x = __builtin_shuffle (u, (U) { 0xBE2ED0AB630B33FE });
+ return __builtin_shufflevector (u, x, 2, 1, 0, 3);
+}
diff --git a/gcc/tree-ssa-forwprop.cc b/gcc/tree-ssa-forwprop.cc
index 48cab5844e0..7da3f80af10 100644
--- a/gcc/tree-ssa-forwprop.cc
+++ b/gcc/tree-ssa-forwprop.cc
@@ -2381,23 +2381,26 @@ simplify_bitfield_ref (gimple_stmt_iterator *gsi)
/* One element. */
if (known_eq (size, elem_size))
- idx = TREE_INT_CST_LOW (VECTOR_CST_ELT (m, idx));
+ idx = TREE_INT_CST_LOW (VECTOR_CST_ELT (m, idx)) % (2 * nelts);
else
{
unsigned HOST_WIDE_INT nelts_op;
if (!constant_multiple_p (size, elem_size, &nelts_op)
|| !pow2p_hwi (nelts_op))
return false;
- unsigned start = TREE_INT_CST_LOW (vector_cst_elt (m, idx));
- unsigned end = TREE_INT_CST_LOW (vector_cst_elt (m, idx + nelts_op - 1));
+ /* Clamp vec_perm_expr index. */
+ unsigned start = TREE_INT_CST_LOW (vector_cst_elt (m, idx)) % (2 * nelts);
+ unsigned end = TREE_INT_CST_LOW (vector_cst_elt (m, idx + nelts_op - 1))
+ % (2 * nelts);
/* Be in the same vector. */
if ((start < nelts) != (end < nelts))
return false;
for (unsigned HOST_WIDE_INT i = 1; i != nelts_op; i++)
{
/* Continuous area. */
- if (TREE_INT_CST_LOW (vector_cst_elt (m, idx + i)) - 1
- != TREE_INT_CST_LOW (vector_cst_elt (m, idx + i - 1)))
+ if (TREE_INT_CST_LOW (vector_cst_elt (m, idx + i)) % (2 * nelts) - 1
+ != TREE_INT_CST_LOW (vector_cst_elt (m, idx + i - 1))
+ % (2 * nelts))
return false;
}
/* Alignment not worse than before. */
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