https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88794
Bug ID: 88794
Summary: fixupimm intrinsics are unusable [9.0 regression]
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: kretz at kde dot org
Target Milestone: ---
Target: x86_64-*-*, i?86-*-*
Test case:
```
#include <x86intrin.h>
__m128 f(__m128 x, __m128 &y) {
y = _mm_fixupimm_ps(x, _mm_set1_epi32(0x00000000), 0x00);
return x;
}
__m128 g(__m128 x, __m128 &y) {
y = _mm_mask_fixupimm_ps(y, -1, x, _mm_set1_epi32(0x00000000), 0x00);
return x;
}
__m128 h(__m128 x, __m128 &y, __mmask16 k) {
y = _mm_mask_fixupimm_ps(y, k, x, _mm_set1_epi32(0x00000000), 0x00);
return x;
}
```
The function f (cf. https://godbolt.org/z/f6u-GI) only compiles with GCC 9;
none of GCC 8, clang, or ICC accept f. If one adds `y, ` as first argument to f
it compiles on non-GCC9 (cf. https://godbolt.org/z/rqPT15).
Besides the incompatibility, fixupimm is unusable on GCC9, because the
functions f and g produce garbage in y.
This was introduced in r265827.
