Instcombile optimization: extractelement(cast) -> cast(extractelement)
llvm-svn: 128683
diff --git a/llvm/test/Transforms/InstCombine/ExtractCast.ll b/llvm/test/Transforms/InstCombine/ExtractCast.ll
new file mode 100644
index 0000000..5ebbefd
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/ExtractCast.ll
@@ -0,0 +1,27 @@
+; RUN: opt < %s -instcombine -S -o - | FileCheck %s
+
+; CHECK: @a
+define i32 @a(<4 x i64> %I) {
+entry:
+; CHECK-NOT: trunc <4 x i64>
+ %J = trunc <4 x i64> %I to <4 x i32>
+ %K = extractelement <4 x i32> %J, i32 3
+; CHECK: extractelement <4 x i64>
+; CHECK: trunc i64
+; CHECK: ret
+ ret i32 %K
+}
+
+
+; CHECK: @b
+define i32 @b(<4 x float> %I) {
+entry:
+; CHECK-NOT: fptosi <4 x float>
+ %J = fptosi <4 x float> %I to <4 x i32>
+ %K = extractelement <4 x i32> %J, i32 3
+; CHECK: extractelement <4 x float>
+; CHECK: fptosi float
+; CHECK: ret
+ ret i32 %K
+}
+