--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=sse2 | FileCheck %s --check-prefix=ALL --check-prefix=SSE
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=avx | FileCheck %s --check-prefix=ALL --check-prefix=AVX
+
+; First, check the generic pattern for any 2 vector constants. Then, check special cases where
+; the constants are all off-by-one. Finally, check the extra special cases where the constants
+; include 0 or -1.
+; Each minimal select test is repeated with a more typical pattern that includes a compare to
+; generate the condition value.
+
+define <4 x i32> @sel_C1_or_C2_vec(<4 x i1> %cond) {
+; SSE-LABEL: sel_C1_or_C2_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pslld $31, %xmm0
+; SSE-NEXT: psrad $31, %xmm0
+; SSE-NEXT: movdqa %xmm0, %xmm1
+; SSE-NEXT: pandn {{.*}}(%rip), %xmm1
+; SSE-NEXT: pand {{.*}}(%rip), %xmm0
+; SSE-NEXT: por %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: sel_C1_or_C2_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpslld $31, %xmm0, %xmm0
+; AVX-NEXT: vmovaps {{.*#+}} xmm1 = [42,0,4294967294,4294967295]
+; AVX-NEXT: vblendvps %xmm0, {{.*}}(%rip), %xmm1, %xmm0
+; AVX-NEXT: retq
+ %add = select <4 x i1> %cond, <4 x i32> <i32 3000, i32 1, i32 -1, i32 0>, <4 x i32> <i32 42, i32 0, i32 -2, i32 -1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @cmp_sel_C1_or_C2_vec(<4 x i32> %x, <4 x i32> %y) {
+; SSE-LABEL: cmp_sel_C1_or_C2_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pcmpeqd %xmm1, %xmm0
+; SSE-NEXT: movdqa %xmm0, %xmm1
+; SSE-NEXT: pandn {{.*}}(%rip), %xmm1
+; SSE-NEXT: pand {{.*}}(%rip), %xmm0
+; SSE-NEXT: por %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: cmp_sel_C1_or_C2_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpcmpeqd %xmm1, %xmm0, %xmm0
+; AVX-NEXT: vmovaps {{.*#+}} xmm1 = [42,0,4294967294,4294967295]
+; AVX-NEXT: vblendvps %xmm0, {{.*}}(%rip), %xmm1, %xmm0
+; AVX-NEXT: retq
+ %cond = icmp eq <4 x i32> %x, %y
+ %add = select <4 x i1> %cond, <4 x i32> <i32 3000, i32 1, i32 -1, i32 0>, <4 x i32> <i32 42, i32 0, i32 -2, i32 -1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @sel_Cplus1_or_C_vec(<4 x i1> %cond) {
+; SSE-LABEL: sel_Cplus1_or_C_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pslld $31, %xmm0
+; SSE-NEXT: psrad $31, %xmm0
+; SSE-NEXT: movdqa %xmm0, %xmm1
+; SSE-NEXT: pandn {{.*}}(%rip), %xmm1
+; SSE-NEXT: pand {{.*}}(%rip), %xmm0
+; SSE-NEXT: por %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: sel_Cplus1_or_C_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpslld $31, %xmm0, %xmm0
+; AVX-NEXT: vmovaps {{.*#+}} xmm1 = [42,0,4294967294,4294967295]
+; AVX-NEXT: vblendvps %xmm0, {{.*}}(%rip), %xmm1, %xmm0
+; AVX-NEXT: retq
+ %add = select <4 x i1> %cond, <4 x i32> <i32 43, i32 1, i32 -1, i32 0>, <4 x i32> <i32 42, i32 0, i32 -2, i32 -1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @cmp_sel_Cplus1_or_C_vec(<4 x i32> %x, <4 x i32> %y) {
+; SSE-LABEL: cmp_sel_Cplus1_or_C_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pcmpeqd %xmm1, %xmm0
+; SSE-NEXT: movdqa %xmm0, %xmm1
+; SSE-NEXT: pandn {{.*}}(%rip), %xmm1
+; SSE-NEXT: pand {{.*}}(%rip), %xmm0
+; SSE-NEXT: por %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: cmp_sel_Cplus1_or_C_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpcmpeqd %xmm1, %xmm0, %xmm0
+; AVX-NEXT: vmovaps {{.*#+}} xmm1 = [42,0,4294967294,4294967295]
+; AVX-NEXT: vblendvps %xmm0, {{.*}}(%rip), %xmm1, %xmm0
+; AVX-NEXT: retq
+ %cond = icmp eq <4 x i32> %x, %y
+ %add = select <4 x i1> %cond, <4 x i32> <i32 43, i32 1, i32 -1, i32 0>, <4 x i32> <i32 42, i32 0, i32 -2, i32 -1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @sel_Cminus1_or_C_vec(<4 x i1> %cond) {
+; SSE-LABEL: sel_Cminus1_or_C_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pslld $31, %xmm0
+; SSE-NEXT: psrad $31, %xmm0
+; SSE-NEXT: movdqa %xmm0, %xmm1
+; SSE-NEXT: pandn {{.*}}(%rip), %xmm1
+; SSE-NEXT: pand {{.*}}(%rip), %xmm0
+; SSE-NEXT: por %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: sel_Cminus1_or_C_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpslld $31, %xmm0, %xmm0
+; AVX-NEXT: vmovaps {{.*#+}} xmm1 = [44,2,0,1]
+; AVX-NEXT: vblendvps %xmm0, {{.*}}(%rip), %xmm1, %xmm0
+; AVX-NEXT: retq
+ %add = select <4 x i1> %cond, <4 x i32> <i32 43, i32 1, i32 -1, i32 0>, <4 x i32> <i32 44, i32 2, i32 0, i32 1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @cmp_sel_Cminus1_or_C_vec(<4 x i32> %x, <4 x i32> %y) {
+; SSE-LABEL: cmp_sel_Cminus1_or_C_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pcmpeqd %xmm1, %xmm0
+; SSE-NEXT: movdqa %xmm0, %xmm1
+; SSE-NEXT: pandn {{.*}}(%rip), %xmm1
+; SSE-NEXT: pand {{.*}}(%rip), %xmm0
+; SSE-NEXT: por %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: cmp_sel_Cminus1_or_C_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpcmpeqd %xmm1, %xmm0, %xmm0
+; AVX-NEXT: vmovaps {{.*#+}} xmm1 = [44,2,0,1]
+; AVX-NEXT: vblendvps %xmm0, {{.*}}(%rip), %xmm1, %xmm0
+; AVX-NEXT: retq
+ %cond = icmp eq <4 x i32> %x, %y
+ %add = select <4 x i1> %cond, <4 x i32> <i32 43, i32 1, i32 -1, i32 0>, <4 x i32> <i32 44, i32 2, i32 0, i32 1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @sel_minus1_or_0_vec(<4 x i1> %cond) {
+; SSE-LABEL: sel_minus1_or_0_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pslld $31, %xmm0
+; SSE-NEXT: psrad $31, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: sel_minus1_or_0_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpslld $31, %xmm0, %xmm0
+; AVX-NEXT: vpsrad $31, %xmm0, %xmm0
+; AVX-NEXT: retq
+ %add = select <4 x i1> %cond, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> <i32 0, i32 0, i32 0, i32 0>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @cmp_sel_minus1_or_0_vec(<4 x i32> %x, <4 x i32> %y) {
+; SSE-LABEL: cmp_sel_minus1_or_0_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pcmpeqd %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: cmp_sel_minus1_or_0_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpcmpeqd %xmm1, %xmm0, %xmm0
+; AVX-NEXT: retq
+ %cond = icmp eq <4 x i32> %x, %y
+ %add = select <4 x i1> %cond, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> <i32 0, i32 0, i32 0, i32 0>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @sel_0_or_minus1_vec(<4 x i1> %cond) {
+; SSE-LABEL: sel_0_or_minus1_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pslld $31, %xmm0
+; SSE-NEXT: psrad $31, %xmm0
+; SSE-NEXT: pcmpeqd %xmm1, %xmm1
+; SSE-NEXT: pxor %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: sel_0_or_minus1_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpslld $31, %xmm0, %xmm0
+; AVX-NEXT: vxorps %xmm1, %xmm1, %xmm1
+; AVX-NEXT: vpcmpeqd %xmm2, %xmm2, %xmm2
+; AVX-NEXT: vblendvps %xmm0, %xmm1, %xmm2, %xmm0
+; AVX-NEXT: retq
+ %add = select <4 x i1> %cond, <4 x i32> <i32 0, i32 0, i32 0, i32 0>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @cmp_sel_0_or_minus1_vec(<4 x i32> %x, <4 x i32> %y) {
+; SSE-LABEL: cmp_sel_0_or_minus1_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pcmpeqd %xmm1, %xmm0
+; SSE-NEXT: pcmpeqd %xmm1, %xmm1
+; SSE-NEXT: pxor %xmm1, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: cmp_sel_0_or_minus1_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpcmpeqd %xmm1, %xmm0, %xmm0
+; AVX-NEXT: vpcmpeqd %xmm1, %xmm1, %xmm1
+; AVX-NEXT: vpxor %xmm1, %xmm0, %xmm0
+; AVX-NEXT: retq
+ %cond = icmp eq <4 x i32> %x, %y
+ %add = select <4 x i1> %cond, <4 x i32> <i32 0, i32 0, i32 0, i32 0>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @sel_1_or_0_vec(<4 x i1> %cond) {
+; SSE-LABEL: sel_1_or_0_vec:
+; SSE: # BB#0:
+; SSE-NEXT: andps {{.*}}(%rip), %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: sel_1_or_0_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vandps {{.*}}(%rip), %xmm0, %xmm0
+; AVX-NEXT: retq
+ %add = select <4 x i1> %cond, <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 0, i32 0, i32 0, i32 0>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @cmp_sel_1_or_0_vec(<4 x i32> %x, <4 x i32> %y) {
+; SSE-LABEL: cmp_sel_1_or_0_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pcmpeqd %xmm1, %xmm0
+; SSE-NEXT: psrld $31, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: cmp_sel_1_or_0_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpcmpeqd %xmm1, %xmm0, %xmm0
+; AVX-NEXT: vpsrld $31, %xmm0, %xmm0
+; AVX-NEXT: retq
+ %cond = icmp eq <4 x i32> %x, %y
+ %add = select <4 x i1> %cond, <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 0, i32 0, i32 0, i32 0>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @sel_0_or_1_vec(<4 x i1> %cond) {
+; SSE-LABEL: sel_0_or_1_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pslld $31, %xmm0
+; SSE-NEXT: psrad $31, %xmm0
+; SSE-NEXT: pandn {{.*}}(%rip), %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: sel_0_or_1_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpslld $31, %xmm0, %xmm0
+; AVX-NEXT: vxorps %xmm1, %xmm1, %xmm1
+; AVX-NEXT: vmovaps {{.*#+}} xmm2 = [1,1,1,1]
+; AVX-NEXT: vblendvps %xmm0, %xmm1, %xmm2, %xmm0
+; AVX-NEXT: retq
+ %add = select <4 x i1> %cond, <4 x i32> <i32 0, i32 0, i32 0, i32 0>, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
+ ret <4 x i32> %add
+}
+
+define <4 x i32> @cmp_sel_0_or_1_vec(<4 x i32> %x, <4 x i32> %y) {
+; SSE-LABEL: cmp_sel_0_or_1_vec:
+; SSE: # BB#0:
+; SSE-NEXT: pcmpeqd %xmm1, %xmm0
+; SSE-NEXT: pandn {{.*}}(%rip), %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: cmp_sel_0_or_1_vec:
+; AVX: # BB#0:
+; AVX-NEXT: vpcmpeqd %xmm1, %xmm0, %xmm0
+; AVX-NEXT: vpandn {{.*}}(%rip), %xmm0, %xmm0
+; AVX-NEXT: retq
+ %cond = icmp eq <4 x i32> %x, %y
+ %add = select <4 x i1> %cond, <4 x i32> <i32 0, i32 0, i32 0, i32 0>, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
+ ret <4 x i32> %add
+}
+