Testcase for PR2585.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55151 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/vec_shuffle-21.ll b/test/CodeGen/X86/vec_shuffle-21.ll
new file mode 100644 (file)
index 0000000..5409acf
--- /dev/null
+++ b/test/CodeGen/X86/vec_shuffle-21.ll
@@ -0,0 +1,21 @@
+; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 -o %t -f
+; RUN: grep pshuflw %t | count 1
+; RUN: grep pextrw %t | count 2
+; RUN: grep pinsrw %t | count 2
+; PR2585
+
+; FIXME: This testcase produces icky code. It can be made much better!
+
+external constant <4 x i32>             ; <<4 x i32>*>:0 [#uses=1]
+external constant <4 x i16>             ; <<4 x i16>*>:1 [#uses=1]
+
+define internal void @""() {
+        load <4 x i32>* @0, align 16            ; <<4 x i32>>:1 [#uses=1]
+        bitcast <4 x i32> %1 to <8 x i16>               ; <<8 x i16>>:2[#uses=1]
+        shufflevector <8 x i16> %2, <8 x i16> undef, <8 x i32> < i32 0, i32 2, i32 4, i32 6, i32 undef, i32 undef, i32 undef, i32 undef >               ; <<8x i16>>:3 [#uses=1]
+        bitcast <8 x i16> %3 to <2 x i64>               ; <<2 x i64>>:4 [#uses=1]
+        extractelement <2 x i64> %4, i32 0              ; <i64>:5 [#uses=1]
+        bitcast i64 %5 to <4 x i16>             ; <<4 x i16>>:6 [#uses=1]
+        store <4 x i16> %6, <4 x i16>* @1, align 8
+        ret void
+}