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* [gcc r11-9962] rtlanal: Fix up replace_rtx [PR105333]
@ 2022-05-06 23:44 Jakub Jelinek
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From: Jakub Jelinek @ 2022-05-06 23:44 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:70d8bd6edae08bfc520dfb4b455b4592e3e2afe9
commit r11-9962-g70d8bd6edae08bfc520dfb4b455b4592e3e2afe9
Author: Jakub Jelinek <jakub@redhat.com>
Date: Fri Apr 22 13:38:11 2022 +0200
rtlanal: Fix up replace_rtx [PR105333]
The following testcase FAILs, because replace_rtx replaces a REG with
CONST_WIDE_INT inside of a SUBREG, which is an invalid transformation
because a SUBREG relies on SUBREG_REG having non-VOIDmode but
CONST_WIDE_INT has VOIDmode.
replace_rtx already has code to deal with it, but it was doing
it only for CONST_INTs. The following patch does it also for
VOIDmode CONST_DOUBLE or CONST_WIDE_INT.
2022-04-22 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/105333
* rtlanal.c (replace_rtx): Use simplify_subreg or
simplify_unary_operation if CONST_SCALAR_INT_P rather than just
CONST_INT_P.
* gcc.dg/pr105333.c: New test.
(cherry picked from commit 7092b7aea122a91824d048aeb23834cf1d19b1a1)
Diff:
---
gcc/rtlanal.c | 4 ++--
gcc/testsuite/gcc.dg/pr105333.c | 21 +++++++++++++++++++++
2 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index 67a49e65fd8..88b37584f74 100644
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -3405,7 +3405,7 @@ replace_rtx (rtx x, rtx from, rtx to, bool all_regs)
{
rtx new_rtx = replace_rtx (SUBREG_REG (x), from, to, all_regs);
- if (CONST_INT_P (new_rtx))
+ if (CONST_SCALAR_INT_P (new_rtx))
{
x = simplify_subreg (GET_MODE (x), new_rtx,
GET_MODE (SUBREG_REG (x)),
@@ -3421,7 +3421,7 @@ replace_rtx (rtx x, rtx from, rtx to, bool all_regs)
{
rtx new_rtx = replace_rtx (XEXP (x, 0), from, to, all_regs);
- if (CONST_INT_P (new_rtx))
+ if (CONST_SCALAR_INT_P (new_rtx))
{
x = simplify_unary_operation (ZERO_EXTEND, GET_MODE (x),
new_rtx, GET_MODE (XEXP (x, 0)));
diff --git a/gcc/testsuite/gcc.dg/pr105333.c b/gcc/testsuite/gcc.dg/pr105333.c
new file mode 100644
index 00000000000..bd8bd4cd56c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr105333.c
@@ -0,0 +1,21 @@
+/* PR rtl-optimization/105333 */
+/* { dg-do compile { target int128 } } */
+/* { dg-options "-Og -fno-tree-coalesce-vars -fno-tree-fre" } */
+
+int g;
+short s;
+
+static inline unsigned short
+bar (short a, __int128 b)
+{
+ b ^= (unsigned long) -a;
+ __builtin_strncpy ((void *) &s, (void *) &a, 1);
+ b *= 14;
+ return b;
+}
+
+void
+foo (void)
+{
+ g *= (__int128) bar (1, 1);
+}
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