[llvm] [X86][FP16] Fix crash issue when AVX512VL is not set (PR #119309)

[Phoebe Wang via llvm-commits]

================
@@ -1641,26 +1641,188 @@ define <4 x half> @test_fmaximum_v4f16(<4 x half> %x, <4 x half> %y) {
 ;
 ; AVX512-LABEL: test_fmaximum_v4f16:
 ; AVX512:       # %bb.0:
-; AVX512-NEXT:    vcvtph2ps %xmm0, %ymm2
-; AVX512-NEXT:    vcvtph2ps %xmm1, %ymm3
-; AVX512-NEXT:    vcmpltps %ymm2, %ymm3, %ymm4
-; AVX512-NEXT:    vpmovdw %zmm4, %ymm4
-; AVX512-NEXT:    vpblendvb %xmm4, %xmm0, %xmm1, %xmm4
-; AVX512-NEXT:    vcmpunordps %ymm3, %ymm2, %ymm2
-; AVX512-NEXT:    vpmovdw %zmm2, %ymm2
-; AVX512-NEXT:    vpbroadcastw {{.*#+}} xmm3 = [NaN,NaN,NaN,NaN,NaN,NaN,NaN,NaN]
-; AVX512-NEXT:    vpblendvb %xmm2, %xmm3, %xmm4, %xmm2
-; AVX512-NEXT:    vpxor %xmm3, %xmm3, %xmm3
-; AVX512-NEXT:    vpcmpeqw %xmm3, %xmm0, %xmm4
-; AVX512-NEXT:    vpblendvb %xmm4, %xmm0, %xmm2, %xmm0
-; AVX512-NEXT:    vpcmpeqw %xmm3, %xmm1, %xmm3
-; AVX512-NEXT:    vpblendvb %xmm3, %xmm1, %xmm0, %xmm0
-; AVX512-NEXT:    vcvtph2ps %xmm2, %ymm1
-; AVX512-NEXT:    vpxor %xmm3, %xmm3, %xmm3
-; AVX512-NEXT:    vcmpeqps %ymm3, %ymm1, %ymm1
-; AVX512-NEXT:    vpmovdw %zmm1, %ymm1
-; AVX512-NEXT:    vpblendvb %xmm1, %xmm0, %xmm2, %xmm0
-; AVX512-NEXT:    vzeroupper
+; AVX512-NEXT:    pushq %rbp
----------------
phoebewang wrote:

Done.

https://github.com/llvm/llvm-project/pull/119309