https://gcc.gnu.org/g:600cab162c561c3061317c998972b0ed1b681d5b
commit r15-5441-g600cab162c561c3061317c998972b0ed1b681d5b
Author: Jakub Jelinek <ja...@redhat.com>
Date: Tue Nov 19 10:25:57 2024 +0100
bitintlower: Handle PAREN_EXPR [PR117459]
The following patch handles PAREN_EXPR in bitint lowering, and handles it
as an optimization barrier, so that temporary arithmetics from PAREN_EXPR
isn't mixed with temporary arithmetics from outside of the PAREN_EXPR.
2024-11-19 Jakub Jelinek <ja...@redhat.com>
PR middle-end/117459
* gimple-lower-bitint.cc (bitint_large_huge::handle_stmt,
bitint_large_huge::lower_stmt): Handle PAREN_EXPR.
* gcc.dg/torture/bitint-74.c: New test.
Diff:
---
gcc/gimple-lower-bitint.cc | 5 ++++-
gcc/testsuite/gcc.dg/torture/bitint-74.c | 27 +++++++++++++++++++++++++++
2 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/gcc/gimple-lower-bitint.cc b/gcc/gimple-lower-bitint.cc
index 6fc425375b12..ea56c4c5bf8b 100644
--- a/gcc/gimple-lower-bitint.cc
+++ b/gcc/gimple-lower-bitint.cc
@@ -2143,6 +2143,7 @@ bitint_large_huge::handle_stmt (gimple *stmt, tree idx)
idx),
gimple_assign_rhs2 (stmt), idx);
case SSA_NAME:
+ case PAREN_EXPR:
case INTEGER_CST:
return handle_operand (gimple_assign_rhs1 (stmt), idx);
CASE_CONVERT:
@@ -5609,7 +5610,9 @@ bitint_large_huge::lower_stmt (gimple *stmt)
|| gimple_store_p (stmt)
|| gimple_assign_load_p (stmt)
|| eq_p
- || mergeable_cast_p)
+ || mergeable_cast_p
+ || (is_gimple_assign (stmt)
+ && gimple_assign_rhs_code (stmt) == PAREN_EXPR))
{
lhs = lower_mergeable_stmt (stmt, cmp_code, cmp_op1, cmp_op2);
if (!eq_p)
diff --git a/gcc/testsuite/gcc.dg/torture/bitint-74.c
b/gcc/testsuite/gcc.dg/torture/bitint-74.c
new file mode 100644
index 000000000000..f9abe2367656
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/bitint-74.c
@@ -0,0 +1,27 @@
+/* PR middle-end/117459 */
+/* { dg-do run { target bitint } } */
+/* { dg-options "-std=c23" } */
+/* { dg-skip-if "" { ! run_expensive_tests } { "*" } { "-O0" "-O2" } } */
+/* { dg-skip-if "" { ! run_expensive_tests } { "-flto" } { "" } } */
+
+#if __BITINT_MAXWIDTH__ >= 255
+_BitInt(255) b, c, d;
+
+_BitInt(255)
+foo ()
+{
+ return __builtin_assoc_barrier (b + c) + d;
+}
+#endif
+
+int
+main ()
+{
+#if __BITINT_MAXWIDTH__ >= 255
+ b =
3162082328713384445049140446737468449630746270013462291267283007210433157591wb;
+ c =
12998515555477887328635550261966833804427562203752161174274777867442907371807wb;
+ d =
5016523343681809792116154509287659112784399275423992541459788346980443294044wb;
+ if (foo () !=
21177121227873081565800845217991961366842707749189616007001849221633783823442wb)
+ __builtin_abort ();
+#endif
+}
