X86: Fix FastISel SSESelect register class

X86FastISel has been using the wrong register class for VBLENDVPS which
produces a VR128 and needs an extra copy to the target register. The
problem was already hit by the existing test cases when using
> llvm-lit -Dllc="llc -verify-machineinstr"

llvm-svn: 246461

1 files changed, 9 insertions, 3 deletions

diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index f6da84aa4db..a843a27d1b3 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -1921,6 +1921,9 @@ bool X86FastISel::X86FastEmitSSESelect(MVT RetVT, const Instruction *I) {
   unsigned ResultReg;
   
   if (Subtarget->hasAVX()) {
+    const TargetRegisterClass *FR32 = &X86::FR32RegClass;
+    const TargetRegisterClass *VR128 = &X86::VR128RegClass;
+
     // If we have AVX, create 1 blendv instead of 3 logic instructions.
     // Blendv was introduced with SSE 4.1, but the 2 register form implicitly
     // uses XMM0 as the selection register. That may need just as many
@@ -1931,10 +1934,13 @@ bool X86FastISel::X86FastEmitSSESelect(MVT RetVT, const Instruction *I) {
     unsigned BlendOpcode =
       (RetVT.SimpleTy == MVT::f32) ? X86::VBLENDVPSrr : X86::VBLENDVPDrr;
     
-    unsigned CmpReg = fastEmitInst_rri(CmpOpcode, RC, CmpLHSReg, CmpLHSIsKill,
+    unsigned CmpReg = fastEmitInst_rri(CmpOpcode, FR32, CmpLHSReg, CmpLHSIsKill,
                                        CmpRHSReg, CmpRHSIsKill, CC);
-    ResultReg = fastEmitInst_rrr(BlendOpcode, RC, RHSReg, RHSIsKill,
-                                 LHSReg, LHSIsKill, CmpReg, true);
+    unsigned VBlendReg = fastEmitInst_rrr(BlendOpcode, VR128, RHSReg, RHSIsKill,
+                                          LHSReg, LHSIsKill, CmpReg, true);
+    ResultReg = createResultReg(RC);
+    BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
+            TII.get(TargetOpcode::COPY), ResultReg).addReg(VBlendReg);
   } else {
     unsigned CmpReg = fastEmitInst_rri(Opc[0], RC, CmpLHSReg, CmpLHSIsKill,
                                        CmpRHSReg, CmpRHSIsKill, CC);