1 files changed, 164 insertions, 0 deletions
diff --git a/test/CodeGen/X86/combine-vec-shuffle-2.ll b/test/CodeGen/X86/combine-vec-shuffle-2.ll
new file mode 100644
index 0000000..7ab7f80
--- /dev/null
+++ b/test/CodeGen/X86/combine-vec-shuffle-2.ll
@@ -0,0 +1,164 @@
+; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 | FileCheck %s
+
+; Check that DAGCombiner correctly folds the following pairs of shuffles
+; using the following rules:
+;  1. shuffle(shuffle(x, y), undef) -> x
+;  2. shuffle(shuffle(x, y), undef) -> y
+;  3. shuffle(shuffle(x, y), undef) -> shuffle(x, undef)
+;  4. shuffle(shuffle(x, y), undef) -> shuffle(undef, y)
+;
+; Rules 3. and 4. are used only if the resulting shuffle mask is legal.
+
+define <4 x i32> @test1(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 0, i32 4, i32 3, i32 1>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 2, i32 4, i32 0, i32 3>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test1
+; Mask: [3,0,0,1]
+; CHECK: pshufd $67
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test2(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 0, i32 5, i32 2, i32 3>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 2, i32 4, i32 0, i32 3>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test2
+; Mask: [2,0,0,3]
+; CHECK: pshufd $-62
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test3(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 0, i32 6, i32 2, i32 3>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 2, i32 4, i32 0, i32 3>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test3
+; Mask: [2,0,0,3]
+; CHECK: pshufd $-62
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test4(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 0, i32 4, i32 7, i32 1>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 4, i32 4, i32 0, i32 3>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test4
+; Mask: [0,0,0,1]
+; CHECK: pshufd $64
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test5(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 5, i32 5, i32 2, i32 3>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 2, i32 4, i32 4, i32 3>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test5
+; Mask: [1,1]
+; CHECK: movhlps
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test6(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 0, i32 6, i32 2, i32 4>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 2, i32 4, i32 0, i32 4>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test6
+; Mask: [2,0,0,0]
+; CHECK: pshufd $2
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test7(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 0, i32 2, i32 0, i32 2>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test7
+; Mask: [0,2,0,2]
+; CHECK: pshufd $-120
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test8(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 1, i32 4, i32 3, i32 4>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test8
+; Mask: [1,0,3,0]
+; CHECK: pshufd $49
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test9(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 1, i32 3, i32 2, i32 5>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 0, i32 1, i32 4, i32 2>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test9
+; Mask: [1,3,0,2]
+; CHECK: pshufd $-115
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test10(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 1, i32 1, i32 5, i32 5>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 0, i32 4, i32 1, i32 4>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test10
+; Mask: [1,0,1,0]
+; CHECK: pshufd $17
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test11(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 1, i32 2, i32 5, i32 4>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 0, i32 4, i32 1, i32 0>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test11
+; Mask: [1,0,2,1]
+; CHECK: pshufd $97
+; CHECK-NEXT: ret
+
+
+define <4 x i32> @test12(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 0, i32 0, i32 2, i32 4>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 1, i32 4, i32 0, i32 4>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test12
+; Mask: [0,0,0,0]
+; CHECK: pshufd $0
+; CHECK-NEXT: ret
+
+
+; The following pair of shuffles is folded into vector %A.
+define <4 x i32> @test13(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 1, i32 4, i32 2, i32 6>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 4, i32 0, i32 2, i32 4>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test13
+; CHECK-NOT: pshufd
+; CHECK: ret
+
+
+; The following pair of shuffles is folded into vector %B.
+define <4 x i32> @test14(<4 x i32> %A, <4 x i32> %B) {
+  %1 = shufflevector <4 x i32> %A, <4 x i32> %B, <4 x i32> <i32 0, i32 6, i32 2, i32 4>
+  %2 = shufflevector <4 x i32> %1, <4 x i32> undef, <4 x i32> <i32 3, i32 4, i32 1, i32 4>
+  ret <4 x i32> %2
+}
+; CHECK-LABEL: test14
+; CHECK-NOT: pshufd
+; CHECK: ret
+