[X86] Teach how to combine a vselect into a movss/movsd
Add target specific rules for combining vselect dag nodes into movss/movsd
when possible.
If the vector type of the vselect dag node in input is either MVT::v4i13 or
MVT::v4f32, then try to fold according to rules:
1) fold (vselect (build_vector (0, -1, -1, -1)), A, B) -> (movss A, B)
2) fold (vselect (build_vector (-1, 0, 0, 0)), A, B) -> (movss B, A)
If the vector type of the vselect dag node in input is either MVT::v2i64 or
MVT::v2f64 (and we have SSE2), then try to fold according to rules:
3) fold (vselect (build_vector (0, -1)), A, B) -> (movsd A, B)
4) fold (vselect (build_vector (-1, 0)), A, B) -> (movsd B, A)
llvm-svn: 199683
diff --git a/llvm/test/CodeGen/X86/vselect.ll b/llvm/test/CodeGen/X86/vselect.ll
index 36c7983..0cf03fc 100644
--- a/llvm/test/CodeGen/X86/vselect.ll
+++ b/llvm/test/CodeGen/X86/vselect.ll
@@ -174,3 +174,91 @@
; CHECK-NOT: xorps
; CHECK: ret
+define <4 x float> @test18(<4 x float> %a, <4 x float> %b) {
+ %1 = select <4 x i1> <i1 false, i1 true, i1 true, i1 true>, <4 x float> %a, <4 x float> %b
+ ret <4 x float> %1
+}
+; CHECK-LABEL: test18
+; CHECK-NOT: psllw
+; CHECK-NOT: psraw
+; CHECK-NOT: xorps
+; CHECK: movss
+; CHECK: ret
+
+define <4 x i32> @test19(<4 x i32> %a, <4 x i32> %b) {
+ %1 = select <4 x i1> <i1 false, i1 true, i1 true, i1 true>, <4 x i32> %a, <4 x i32> %b
+ ret <4 x i32> %1
+}
+; CHECK-LABEL: test19
+; CHECK-NOT: psllw
+; CHECK-NOT: psraw
+; CHECK-NOT: xorps
+; CHECK: movss
+; CHECK: ret
+
+define <2 x double> @test20(<2 x double> %a, <2 x double> %b) {
+ %1 = select <2 x i1> <i1 false, i1 true>, <2 x double> %a, <2 x double> %b
+ ret <2 x double> %1
+}
+; CHECK-LABEL: test20
+; CHECK-NOT: psllw
+; CHECK-NOT: psraw
+; CHECK-NOT: xorps
+; CHECK: movsd
+; CHECK: ret
+
+define <2 x i64> @test21(<2 x i64> %a, <2 x i64> %b) {
+ %1 = select <2 x i1> <i1 false, i1 true>, <2 x i64> %a, <2 x i64> %b
+ ret <2 x i64> %1
+}
+; CHECK-LABEL: test21
+; CHECK-NOT: psllw
+; CHECK-NOT: psraw
+; CHECK-NOT: xorps
+; CHECK: movsd
+; CHECK: ret
+
+define <4 x float> @test22(<4 x float> %a, <4 x float> %b) {
+ %1 = select <4 x i1> <i1 true, i1 false, i1 false, i1 false>, <4 x float> %a, <4 x float> %b
+ ret <4 x float> %1
+}
+; CHECK-LABEL: test22
+; CHECK-NOT: psllw
+; CHECK-NOT: psraw
+; CHECK-NOT: xorps
+; CHECK: movss
+; CHECK: ret
+
+define <4 x i32> @test23(<4 x i32> %a, <4 x i32> %b) {
+ %1 = select <4 x i1> <i1 true, i1 false, i1 false, i1 false>, <4 x i32> %a, <4 x i32> %b
+ ret <4 x i32> %1
+}
+; CHECK-LABEL: test23
+; CHECK-NOT: psllw
+; CHECK-NOT: psraw
+; CHECK-NOT: xorps
+; CHECK: movss
+; CHECK: ret
+
+define <2 x double> @test24(<2 x double> %a, <2 x double> %b) {
+ %1 = select <2 x i1> <i1 true, i1 false>, <2 x double> %a, <2 x double> %b
+ ret <2 x double> %1
+}
+; CHECK-LABEL: test24
+; CHECK-NOT: psllw
+; CHECK-NOT: psraw
+; CHECK-NOT: xorps
+; CHECK: movsd
+; CHECK: ret
+
+define <2 x i64> @test25(<2 x i64> %a, <2 x i64> %b) {
+ %1 = select <2 x i1> <i1 true, i1 false>, <2 x i64> %a, <2 x i64> %b
+ ret <2 x i64> %1
+}
+; CHECK-LABEL: test25
+; CHECK-NOT: psllw
+; CHECK-NOT: psraw
+; CHECK-NOT: xorps
+; CHECK: movsd
+; CHECK: ret
+