Use movsd to shuffle in the lowest two elements of a v4f32 / v4i32 vector when

movlps cannot be used (e.g. when load from m64 has multiple uses).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28089 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86InstrSSE.td b/lib/Target/X86/X86InstrSSE.td
index 1474881295ee36616c888d039ac92b729614eb54..6b799945b9d9fc93dad6bd02313533fd57f54ff4 100644 (file)
--- a/lib/Target/X86/X86InstrSSE.td
+++ b/lib/Target/X86/X86InstrSSE.td
@@ -2481,6 +2481,14 @@ def : Pat<(v2i64 (vector_shuffle VR128:$src1, VR128:$src2,
                   MOVL_shuffle_mask)),
           (v2i64 (MOVLPDrr VR128:$src1, VR128:$src2))>, Requires<[HasSSE2]>;
 
+// vector_shuffle v1, v2 <4, 5, 2, 3> using MOVLPDrr (movsd)
+def : Pat<(v4f32 (vector_shuffle VR128:$src1, VR128:$src2,
+                  MOVLP_shuffle_mask)),
+          (v4f32 (MOVLPDrr VR128:$src1, VR128:$src2))>, Requires<[HasSSE2]>;
+def : Pat<(v4i32 (vector_shuffle VR128:$src1, VR128:$src2,
+                  MOVLP_shuffle_mask)),
+          (v4i32 (MOVLPDrr VR128:$src1, VR128:$src2))>, Requires<[HasSSE2]>;
+
 // Set lowest element and zero upper elements.
 def : Pat<(bc_v2i64 (vector_shuffle immAllZerosV,
                      (v2f64 (scalar_to_vector (loadf64 addr:$src))),

diff --git a/test/CodeGen/X86/vec_shuffle-5.ll b/test/CodeGen/X86/vec_shuffle-5.ll
new file mode 100644 (file)
index 0000000..ac9c667
--- /dev/null
+++ b/test/CodeGen/X86/vec_shuffle-5.ll
@@ -0,0 +1,11 @@
+; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 | grep movsd | wc -l | grep 1
+
+void %test() {
+       %tmp1 = load <4 x float>* null
+       %tmp2 = shufflevector <4 x float> %tmp1, <4 x float> < float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00 >, <4 x uint> < uint 0, uint 1, uint 6, uint 7 >
+       %tmp3 = shufflevector <4 x float> %tmp1, <4 x float> zeroinitializer, <4 x uint> < uint 2, uint 3, uint 6, uint 7 >
+       %tmp4 = add <4 x float> %tmp2, %tmp3
+       store <4 x float> %tmp4, <4 x float>* null
+       ret void
+}
+