[X86] Tests for unsigned saturation downconvert detection.

llvm-svn: 330088

1 files changed, 310 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/avx512-trunc.ll b/llvm/test/CodeGen/X86/avx512-trunc.ll
index 99af1003c8c..c633c5e718a 100644
--- a/llvm/test/CodeGen/X86/avx512-trunc.ll
+++ b/llvm/test/CodeGen/X86/avx512-trunc.ll
@@ -764,3 +764,313 @@ define <16 x i8> @usat_trunc_db_256(<8 x i32> %x) {
   ret <16 x i8> %tmp4
 }
 
+
+
+; Tests for the following unsigned saturation pattern:
+
+; %a = icmp sgt %x, C1
+; %b = select %a, %x, C2
+; %c = icmp slt %b, C2
+; %d = select %c, %b, C2
+; %res = trunc %d
+
+
+
+define void @smax_usat_trunc_wb_256_mem(<16 x i16> %i, <16 x i8>* %res) {
+; KNL-LABEL: smax_usat_trunc_wb_256_mem:
+; KNL:       ## %bb.0:
+; KNL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; KNL-NEXT:    vpmaxsw %ymm1, %ymm0, %ymm0
+; KNL-NEXT:    vpminsw {{.*}}(%rip), %ymm0, %ymm0
+; KNL-NEXT:    vpmovsxwd %ymm0, %zmm0
+; KNL-NEXT:    vpmovdb %zmm0, (%rdi)
+; KNL-NEXT:    vzeroupper
+; KNL-NEXT:    retq
+;
+; SKX-LABEL: smax_usat_trunc_wb_256_mem:
+; SKX:       ## %bb.0:
+; SKX-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; SKX-NEXT:    vpmaxsw %ymm1, %ymm0, %ymm0
+; SKX-NEXT:    vpminsw {{.*}}(%rip), %ymm0, %ymm0
+; SKX-NEXT:    vpmovwb %ymm0, (%rdi)
+; SKX-NEXT:    vzeroupper
+; SKX-NEXT:    retq
+  %x1 = icmp sgt <16 x i16> %i, <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+  %x2 = select <16 x i1> %x1, <16 x i16> %i, <16 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+  %x3 = icmp slt <16 x i16> %x2, <i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255>
+  %x5 = select <16 x i1> %x3, <16 x i16> %x2, <16 x i16> <i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255>
+  %x6 = trunc <16 x i16> %x5 to <16 x i8>
+  store <16 x i8> %x6, <16 x i8>* %res, align 1
+  ret void
+}
+
+define <16 x i8> @smax_usat_trunc_wb_256(<16 x i16> %i) {
+; KNL-LABEL: smax_usat_trunc_wb_256:
+; KNL:       ## %bb.0:
+; KNL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; KNL-NEXT:    vpmaxsw %ymm1, %ymm0, %ymm0
+; KNL-NEXT:    vpminsw {{.*}}(%rip), %ymm0, %ymm0
+; KNL-NEXT:    vpmovsxwd %ymm0, %zmm0
+; KNL-NEXT:    vpmovdb %zmm0, %xmm0
+; KNL-NEXT:    vzeroupper
+; KNL-NEXT:    retq
+;
+; SKX-LABEL: smax_usat_trunc_wb_256:
+; SKX:       ## %bb.0:
+; SKX-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; SKX-NEXT:    vpmaxsw %ymm1, %ymm0, %ymm0
+; SKX-NEXT:    vpminsw {{.*}}(%rip), %ymm0, %ymm0
+; SKX-NEXT:    vpmovwb %ymm0, %xmm0
+; SKX-NEXT:    vzeroupper
+; SKX-NEXT:    retq
+  %x1 = icmp sgt <16 x i16> %i, <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+  %x2 = select <16 x i1> %x1, <16 x i16> %i, <16 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+  %x3 = icmp slt <16 x i16> %x2, <i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255>
+  %x5 = select <16 x i1> %x3, <16 x i16> %x2, <16 x i16> <i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255>
+  %x6 = trunc <16 x i16> %x5 to <16 x i8>
+  ret <16 x i8> %x6
+  }
+
+define void @smax_usat_trunc_wb_128_mem(<8 x i16> %i, <8 x i8>* %res) {
+; KNL-LABEL: smax_usat_trunc_wb_128_mem:
+; KNL:       ## %bb.0:
+; KNL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; KNL-NEXT:    vpmaxsw %xmm1, %xmm0, %xmm0
+; KNL-NEXT:    vpminsw {{.*}}(%rip), %xmm0, %xmm0
+; KNL-NEXT:    vpackuswb %xmm0, %xmm0, %xmm0
+; KNL-NEXT:    vmovq %xmm0, (%rdi)
+; KNL-NEXT:    retq
+;
+; SKX-LABEL: smax_usat_trunc_wb_128_mem:
+; SKX:       ## %bb.0:
+; SKX-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; SKX-NEXT:    vpmaxsw %xmm1, %xmm0, %xmm0
+; SKX-NEXT:    vpminsw {{.*}}(%rip), %xmm0, %xmm0
+; SKX-NEXT:    vpmovwb %xmm0, (%rdi)
+; SKX-NEXT:    retq
+  %x1 = icmp sgt <8 x i16> %i, <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+  %x2 = select <8 x i1> %x1, <8 x i16> %i, <8 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+  %x3 = icmp slt <8 x i16> %x2, <i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255>
+  %x5 = select <8 x i1> %x3, <8 x i16> %x2, <8 x i16> <i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255>
+  %x6 = trunc <8 x i16> %x5 to <8 x i8>
+  store <8 x i8> %x6, <8 x i8>* %res, align 1
+  ret void
+}
+
+define void @smax_usat_trunc_db_512_mem(<16 x i32> %i, <16 x i8>* %res) {
+; ALL-LABEL: smax_usat_trunc_db_512_mem:
+; ALL:       ## %bb.0:
+; ALL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; ALL-NEXT:    vpmaxsd %zmm1, %zmm0, %zmm0
+; ALL-NEXT:    vpminsd {{.*}}(%rip){1to16}, %zmm0, %zmm0
+; ALL-NEXT:    vpmovdb %zmm0, (%rdi)
+; ALL-NEXT:    vzeroupper
+; ALL-NEXT:    retq
+  %x1 = icmp sgt <16 x i32> %i, <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  %x2 = select <16 x i1> %x1, <16 x i32> %i, <16 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  %x3 = icmp slt <16 x i32> %x2, <i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255>
+  %x5 = select <16 x i1> %x3, <16 x i32> %x2, <16 x i32> <i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255>
+  %x6 = trunc <16 x i32> %x5 to <16 x i8>
+  store <16 x i8> %x6, <16 x i8>* %res, align 1
+  ret void
+}
+
+define void @smax_usat_trunc_qb_512_mem(<8 x i64> %i, <8 x i8>* %res) {
+; ALL-LABEL: smax_usat_trunc_qb_512_mem:
+; ALL:       ## %bb.0:
+; ALL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; ALL-NEXT:    vpmaxsq %zmm1, %zmm0, %zmm0
+; ALL-NEXT:    vpminsq {{.*}}(%rip){1to8}, %zmm0, %zmm0
+; ALL-NEXT:    vpmovqb %zmm0, (%rdi)
+; ALL-NEXT:    vzeroupper
+; ALL-NEXT:    retq
+  %x1 = icmp sgt <8 x i64> %i, <i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0>
+  %x2 = select <8 x i1> %x1, <8 x i64> %i, <8 x i64> <i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0>
+  %x3 = icmp slt <8 x i64> %x2, <i64 255, i64 255, i64 255, i64 255, i64 255, i64 255, i64 255, i64 255>
+  %x5 = select <8 x i1> %x3, <8 x i64> %x2, <8 x i64> <i64 255, i64 255, i64 255, i64 255, i64 255, i64 255, i64 255, i64 255>
+  %x6 = trunc <8 x i64> %x5 to <8 x i8>
+  store <8 x i8> %x6, <8 x i8>* %res, align 1
+  ret void
+}
+
+define void @smax_usat_trunc_qd_512_mem(<8 x i64> %i, <8 x i32>* %res) {
+; ALL-LABEL: smax_usat_trunc_qd_512_mem:
+; ALL:       ## %bb.0:
+; ALL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; ALL-NEXT:    vpmaxsq %zmm1, %zmm0, %zmm0
+; ALL-NEXT:    vpminsq {{.*}}(%rip){1to8}, %zmm0, %zmm0
+; ALL-NEXT:    vpmovqd %zmm0, (%rdi)
+; ALL-NEXT:    vzeroupper
+; ALL-NEXT:    retq
+  %x1 = icmp sgt <8 x i64> %i, <i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0>
+  %x2 = select <8 x i1> %x1, <8 x i64> %i, <8 x i64> <i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0>
+  %x3 = icmp slt <8 x i64> %x2, <i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295>
+  %x5 = select <8 x i1> %x3, <8 x i64> %x2, <8 x i64> <i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295, i64 4294967295>
+  %x6 = trunc <8 x i64> %x5 to <8 x i32>
+  store <8 x i32> %x6, <8 x i32>* %res, align 1
+  ret void
+}
+
+define void @smax_usat_trunc_qw_512_mem(<8 x i64> %i, <8 x i16>* %res) {
+; ALL-LABEL: smax_usat_trunc_qw_512_mem:
+; ALL:       ## %bb.0:
+; ALL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; ALL-NEXT:    vpmaxsq %zmm1, %zmm0, %zmm0
+; ALL-NEXT:    vpminsq {{.*}}(%rip){1to8}, %zmm0, %zmm0
+; ALL-NEXT:    vpmovqw %zmm0, (%rdi)
+; ALL-NEXT:    vzeroupper
+; ALL-NEXT:    retq
+  %x1 = icmp sgt <8 x i64> %i, <i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0>
+  %x2 = select <8 x i1> %x1, <8 x i64> %i, <8 x i64> <i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0>
+  %x3 = icmp slt <8 x i64> %x2, <i64 65535, i64 65535, i64 65535, i64 65535, i64 65535, i64 65535, i64 65535, i64 65535>
+  %x5 = select <8 x i1> %x3, <8 x i64> %x2, <8 x i64> <i64 65535, i64 65535, i64 65535, i64 65535, i64 65535, i64 65535, i64 65535, i64 65535>
+  %x6 = trunc <8 x i64> %x5 to <8 x i16>
+  store <8 x i16> %x6, <8 x i16>* %res, align 1
+  ret void
+}
+
+define <32 x i8> @smax_usat_trunc_db_1024(<32 x i32> %i) {
+; KNL-LABEL: smax_usat_trunc_db_1024:
+; KNL:       ## %bb.0:
+; KNL-NEXT:    vpxor %xmm2, %xmm2, %xmm2
+; KNL-NEXT:    vpmaxsd %zmm2, %zmm0, %zmm0
+; KNL-NEXT:    vpmaxsd %zmm2, %zmm1, %zmm1
+; KNL-NEXT:    vpbroadcastd {{.*#+}} zmm2 = [255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255]
+; KNL-NEXT:    vpminsd %zmm2, %zmm1, %zmm1
+; KNL-NEXT:    vpminsd %zmm2, %zmm0, %zmm0
+; KNL-NEXT:    vpmovdb %zmm0, %xmm0
+; KNL-NEXT:    vpmovdb %zmm1, %xmm1
+; KNL-NEXT:    vinserti128 $1, %xmm1, %ymm0, %ymm0
+; KNL-NEXT:    retq
+;
+; SKX-LABEL: smax_usat_trunc_db_1024:
+; SKX:       ## %bb.0:
+; SKX-NEXT:    vpxor %xmm2, %xmm2, %xmm2
+; SKX-NEXT:    vpmaxsd %zmm2, %zmm0, %zmm0
+; SKX-NEXT:    vpmaxsd %zmm2, %zmm1, %zmm1
+; SKX-NEXT:    vpbroadcastd {{.*#+}} zmm2 = [255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255]
+; SKX-NEXT:    vpminsd %zmm2, %zmm1, %zmm1
+; SKX-NEXT:    vpminsd %zmm2, %zmm0, %zmm0
+; SKX-NEXT:    vpmovdw %zmm0, %ymm0
+; SKX-NEXT:    vpmovdw %zmm1, %ymm1
+; SKX-NEXT:    vinserti64x4 $1, %ymm1, %zmm0, %zmm0
+; SKX-NEXT:    vpmovwb %zmm0, %ymm0
+; SKX-NEXT:    retq
+  %x1 = icmp sgt <32 x i32> %i, <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  %x2 = select <32 x i1> %x1, <32 x i32> %i, <32 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  %x3 = icmp slt <32 x i32> %x2, <i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255>
+  %x5 = select <32 x i1> %x3, <32 x i32> %x2, <32 x i32> <i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255>
+  %x6 = trunc <32 x i32> %x5 to <32 x i8>
+  ret <32 x i8> %x6
+}
+
+define void @smax_usat_trunc_db_1024_mem(<32 x i32> %i, <32 x i8>* %p) {
+; KNL-LABEL: smax_usat_trunc_db_1024_mem:
+; KNL:       ## %bb.0:
+; KNL-NEXT:    vpxor %xmm2, %xmm2, %xmm2
+; KNL-NEXT:    vpmaxsd %zmm2, %zmm0, %zmm0
+; KNL-NEXT:    vpmaxsd %zmm2, %zmm1, %zmm1
+; KNL-NEXT:    vpbroadcastd {{.*#+}} zmm2 = [255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255]
+; KNL-NEXT:    vpminsd %zmm2, %zmm1, %zmm1
+; KNL-NEXT:    vpminsd %zmm2, %zmm0, %zmm0
+; KNL-NEXT:    vpmovdb %zmm0, %xmm0
+; KNL-NEXT:    vpmovdb %zmm1, %xmm1
+; KNL-NEXT:    vinserti128 $1, %xmm1, %ymm0, %ymm0
+; KNL-NEXT:    vmovdqu %ymm0, (%rdi)
+; KNL-NEXT:    vzeroupper
+; KNL-NEXT:    retq
+;
+; SKX-LABEL: smax_usat_trunc_db_1024_mem:
+; SKX:       ## %bb.0:
+; SKX-NEXT:    vpxor %xmm2, %xmm2, %xmm2
+; SKX-NEXT:    vpmaxsd %zmm2, %zmm0, %zmm0
+; SKX-NEXT:    vpmaxsd %zmm2, %zmm1, %zmm1
+; SKX-NEXT:    vpbroadcastd {{.*#+}} zmm2 = [255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255]
+; SKX-NEXT:    vpminsd %zmm2, %zmm1, %zmm1
+; SKX-NEXT:    vpminsd %zmm2, %zmm0, %zmm0
+; SKX-NEXT:    vpmovdw %zmm0, %ymm0
+; SKX-NEXT:    vpmovdw %zmm1, %ymm1
+; SKX-NEXT:    vinserti64x4 $1, %ymm1, %zmm0, %zmm0
+; SKX-NEXT:    vpmovwb %zmm0, (%rdi)
+; SKX-NEXT:    vzeroupper
+; SKX-NEXT:    retq
+  %x1 = icmp sgt <32 x i32> %i, <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  %x2 = select <32 x i1> %x1, <32 x i32> %i, <32 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  %x3 = icmp slt <32 x i32> %x2, <i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255>
+  %x5 = select <32 x i1> %x3, <32 x i32> %x2, <32 x i32> <i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255>
+  %x6 = trunc <32 x i32> %x5 to <32 x i8>
+  store <32 x i8>%x6, <32 x i8>* %p, align 1
+  ret void
+}
+
+define <16 x i16> @smax_usat_trunc_dw_512(<16 x i32> %i) {
+; ALL-LABEL: smax_usat_trunc_dw_512:
+; ALL:       ## %bb.0:
+; ALL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; ALL-NEXT:    vpmaxsd %zmm1, %zmm0, %zmm0
+; ALL-NEXT:    vpminsd {{.*}}(%rip){1to16}, %zmm0, %zmm0
+; ALL-NEXT:    vpmovdw %zmm0, %ymm0
+; ALL-NEXT:    retq
+  %x1 = icmp sgt <16 x i32> %i, <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  %x2 = select <16 x i1> %x1, <16 x i32> %i, <16 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  %x3 = icmp slt <16 x i32> %x2, <i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535>
+  %x5 = select <16 x i1> %x3, <16 x i32> %x2, <16 x i32> <i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535>
+  %x6 = trunc <16 x i32> %x5 to <16 x i16>
+  ret <16 x i16> %x6
+}
+
+define void @negative_test1_smax_usat_trunc_wb_256_mem(<16 x i16> %i, <16 x i8>* %res) {
+; KNL-LABEL: negative_test1_smax_usat_trunc_wb_256_mem:
+; KNL:       ## %bb.0:
+; KNL-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; KNL-NEXT:    vpmaxsw %ymm1, %ymm0, %ymm0
+; KNL-NEXT:    vpcmpeqd %ymm1, %ymm1, %ymm1
+; KNL-NEXT:    vpminsw %ymm1, %ymm0, %ymm0
+; KNL-NEXT:    vpmovsxwd %ymm0, %zmm0
+; KNL-NEXT:    vpmovdb %zmm0, (%rdi)
+; KNL-NEXT:    vzeroupper
+; KNL-NEXT:    retq
+;
+; SKX-LABEL: negative_test1_smax_usat_trunc_wb_256_mem:
+; SKX:       ## %bb.0:
+; SKX-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; SKX-NEXT:    vpmaxsw %ymm1, %ymm0, %ymm0
+; SKX-NEXT:    vpcmpeqd %ymm1, %ymm1, %ymm1
+; SKX-NEXT:    vpminsw %ymm1, %ymm0, %ymm0
+; SKX-NEXT:    vpmovwb %ymm0, (%rdi)
+; SKX-NEXT:    vzeroupper
+; SKX-NEXT:    retq
+  %x1 = icmp sgt <16 x i16> %i, <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+  %x2 = select <16 x i1> %x1, <16 x i16> %i, <16 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+  %x3 = icmp slt <16 x i16> %x2, <i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1>
+  %x5 = select <16 x i1> %x3, <16 x i16> %x2, <16 x i16> <i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1>
+  %x6 = trunc <16 x i16> %x5 to <16 x i8>
+  store <16 x i8> %x6, <16 x i8>* %res, align 1
+  ret void
+}
+
+define void @negative_test2_smax_usat_trunc_wb_256_mem(<16 x i16> %i, <16 x i8>* %res) {
+; KNL-LABEL: negative_test2_smax_usat_trunc_wb_256_mem:
+; KNL:       ## %bb.0:
+; KNL-NEXT:    vpmaxsw {{.*}}(%rip), %ymm0, %ymm0
+; KNL-NEXT:    vpminsw {{.*}}(%rip), %ymm0, %ymm0
+; KNL-NEXT:    vpmovsxwd %ymm0, %zmm0
+; KNL-NEXT:    vpmovdb %zmm0, (%rdi)
+; KNL-NEXT:    vzeroupper
+; KNL-NEXT:    retq
+;
+; SKX-LABEL: negative_test2_smax_usat_trunc_wb_256_mem:
+; SKX:       ## %bb.0:
+; SKX-NEXT:    vpmaxsw {{.*}}(%rip), %ymm0, %ymm0
+; SKX-NEXT:    vpminsw {{.*}}(%rip), %ymm0, %ymm0
+; SKX-NEXT:    vpmovwb %ymm0, (%rdi)
+; SKX-NEXT:    vzeroupper
+; SKX-NEXT:    retq
+  %x1 = icmp sgt <16 x i16> %i, <i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10>
+  %x2 = select <16 x i1> %x1, <16 x i16> %i, <16 x i16> <i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10, i16 -10>
+  %x3 = icmp slt <16 x i16> %x2, <i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5>
+  %x5 = select <16 x i1> %x3, <16 x i16> %x2, <16 x i16> <i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5, i16 -5>
+  %x6 = trunc <16 x i16> %x5 to <16 x i8>
+  store <16 x i8> %x6, <16 x i8>* %res, align 1
+  ret void
+}