1 files changed, 67 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/pr19420.ll b/test/Transforms/InstCombine/pr19420.ll
new file mode 100644
index 0000000..23fa0a4
--- /dev/null
+++ b/test/Transforms/InstCombine/pr19420.ll
@@ -0,0 +1,67 @@
+; RUN: opt -S -instcombine < %s | FileCheck %s
+
+; CHECK-LABEL: @test_FoldShiftByConstant_CreateSHL
+; CHECK: mul <4 x i32> %in, <i32 0, i32 -32, i32 0, i32 -32>
+; CHECK-NEXT: ret
+define <4 x i32> @test_FoldShiftByConstant_CreateSHL(<4 x i32> %in) {
+  %mul.i = mul <4 x i32> %in, <i32 0, i32 -1, i32 0, i32 -1>
+  %vshl_n = shl <4 x i32> %mul.i, <i32 5, i32 5, i32 5, i32 5>
+  ret <4 x i32> %vshl_n
+}
+
+; CHECK-LABEL: @test_FoldShiftByConstant_CreateSHL2
+; CHECK: mul <8 x i16> %in, <i16 0, i16 -32, i16 0, i16 -32, i16 0, i16 -32, i16 0, i16 -32>
+; CHECK-NEXT: ret
+define <8 x i16> @test_FoldShiftByConstant_CreateSHL2(<8 x i16> %in) {
+  %mul.i = mul <8 x i16> %in, <i16 0, i16 -1, i16 0, i16 -1, i16 0, i16 -1, i16 0, i16 -1>
+  %vshl_n = shl <8 x i16> %mul.i, <i16 5, i16 5, i16 5, i16 5, i16 5, i16 5, i16 5, i16 5>
+  ret <8 x i16> %vshl_n
+}
+
+; CHECK-LABEL: @test_FoldShiftByConstant_CreateAnd
+; CHECK: mul <16 x i8> %in0, <i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33, i8 33>
+; CHECK-NEXT: and <16 x i8> %vsra_n2, <i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32, i8 -32>
+; CHECK-NEXT: ret
+define <16 x i8> @test_FoldShiftByConstant_CreateAnd(<16 x i8> %in0) {
+  %vsra_n = ashr <16 x i8> %in0, <i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5>
+  %tmp = add <16 x i8> %in0, %vsra_n
+  %vshl_n = shl <16 x i8> %tmp, <i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5>
+  ret <16 x i8> %vshl_n
+}
+
+
+define i32 @bar(i32 %x, i32 %y) {
+  %a = lshr i32 %x, 4
+  %b = add i32 %a, %y
+  %c = shl i32 %b, 4
+  ret i32 %c
+}
+
+define <2 x i32> @bar_v2i32(<2 x i32> %x, <2 x i32> %y) {
+  %a = lshr <2 x i32> %x, <i32 5, i32 5>
+  %b = add <2 x i32> %a, %y
+  %c = shl <2 x i32> %b, <i32 5, i32 5>
+  ret <2 x i32> %c
+}
+
+
+
+
+define i32 @foo(i32 %x, i32 %y) {
+  %a = lshr i32 %x, 4
+  %b = and i32 %a, 8
+  %c = add i32 %b, %y
+  %d = shl i32 %c, 4
+  ret i32 %d
+}
+
+define <2 x i32> @foo_v2i32(<2 x i32> %x, <2 x i32> %y) {
+  %a = lshr <2 x i32> %x, <i32 4, i32 4>
+  %b = and <2 x i32> %a, <i32 8, i32 8>
+  %c = add <2 x i32> %b, %y
+  %d = shl <2 x i32> %c, <i32 4, i32 4>
+  ret <2 x i32> %d
+}
+
+
+