https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103727
Bug ID: 103727
Summary: [aarch64] Too strict built-in decl check
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: linkw at gcc dot gnu.org
Target Milestone: ---
As PR102347 discussed and tested, aarch64 also does too strict built-in
function decl check. Here is one test case copied from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102347#c3
Testcase:
int64x2_t v1 = {100, 200};
int32x4_t v2 = {11, 22, 33, 44};
#pragma GCC target ("+simd")
int main()
{
uint64x2_t vres = (uint64x2_t) __builtin_aarch64_usubw2v4si (v1, v2);
printf("vres: %lld %lld\n", vres[0], vres[1]);
return 0;
}
-march=armv8-a+nosimd // PASS
-march=armv8-a+nosimd -flto // FAIL
Andrew had more insightful comments
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102347#c5)
"Right for aarch64, most people won't use +simd/+nosimd combo (though it might
show up inside the kernel) but they might use +sve/+nosve ...
So the aarch64 bug should be fixed"
