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Mark IFN_ADD/MUL_OVERFLOW as commutative

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gcc/
	* internal-fn.c (commutative_binary_fn_p): Handle IFN_ADD_OVERFLOW
	and IFN_MUL_OVERFLOW.

gcc/testsuite/
	* gcc.dg/add-mul-overflow-1.c: New test.
This commit is contained in:
Richard Sandiford 2021-11-30 09:52:27 +00:00
parent 12e3801278
commit b1d15146b6
2 changed files with 30 additions and 0 deletions
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2
gcc/internal-fn.c
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@ -3834,6 +3834,8 @@ commutative_binary_fn_p (internal_fn fn)
case IFN_COMPLEX_MUL:
case IFN_UBSAN_CHECK_ADD:
case IFN_UBSAN_CHECK_MUL:
case IFN_ADD_OVERFLOW:
case IFN_MUL_OVERFLOW:
return true;
default:

28
gcc/testsuite/gcc.dg/add-mul-overflow-1.c Normal file
View File

@ -0,0 +1,28 @@
/* { dg-options "-O -fdump-tree-optimized" } */
int res[4];
void
f1 (int x, int y)
{
res[2] = __builtin_add_overflow (x, y, res + 0);
res[3] = __builtin_add_overflow (y, x, res + 1);
}
void
f2 (int x, int y)
{
res[2] = __builtin_sub_overflow (x, y, res + 0);
res[3] = __builtin_sub_overflow (y, x, res + 1);
}
void
f3 (int x, int y)
{
res[2] = __builtin_mul_overflow (x, y, res + 0);
res[3] = __builtin_mul_overflow (y, x, res + 1);
}
/* { dg-final { scan-tree-dump-times {\.ADD_OVERFLOW} 1 "optimized" } } */
/* { dg-final { scan-tree-dump-times {\.SUB_OVERFLOW} 2 "optimized" } } */
/* { dg-final { scan-tree-dump-times {\.MUL_OVERFLOW} 1 "optimized" } } */