[llvm] r299336 - [X86][MMX] Simplify tablegen patterns by always combining MOVDQ2Q from v2i64

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Sun Apr  2 11:20:34 2017
New Revision: 299336

URL: http://llvm.org/viewvc/llvm-project?rev=299336&view=rev
Log:
[X86][MMX] Simplify tablegen patterns by always combining MOVDQ2Q from v2i64

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
    llvm/trunk/test/CodeGen/X86/mmx-cvt.ll

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=299336&r1=299335&r2=299336&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Sun Apr  2 11:20:34 2017
@@ -28965,7 +28965,8 @@ static SDValue combineBitcast(SDNode *N,
       isNullConstant(N0.getOperand(1))) {
     SDValue N00 = N0->getOperand(0);
     if (N00.getValueType().is128BitVector())
-      return DAG.getNode(X86ISD::MOVDQ2Q, SDLoc(N00), VT, N00);
+      return DAG.getNode(X86ISD::MOVDQ2Q, SDLoc(N00), VT,
+                         DAG.getBitcast(MVT::v2i64, N00));
   }
 
   // Convert a bitcasted integer logic operation that has one bitcasted

Modified: llvm/trunk/test/CodeGen/X86/mmx-cvt.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/mmx-cvt.ll?rev=299336&r1=299335&r2=299336&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/mmx-cvt.ll (original)
+++ llvm/trunk/test/CodeGen/X86/mmx-cvt.ll Sun Apr  2 11:20:34 2017
@@ -195,8 +195,7 @@ define void @fptosi_v4f32_v4i32(<4 x flo
 ; X86-NEXT:    andl $-8, %esp
 ; X86-NEXT:    subl $8, %esp
 ; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    cvttps2dq %xmm0, %xmm0
-; X86-NEXT:    movdq2q %xmm0, %mm0
+; X86-NEXT:    cvttps2pi %xmm0, %mm0
 ; X86-NEXT:    paddd %mm0, %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %ecx
@@ -209,8 +208,7 @@ define void @fptosi_v4f32_v4i32(<4 x flo
 ;
 ; X64-LABEL: fptosi_v4f32_v4i32:
 ; X64:       # BB#0:
-; X64-NEXT:    cvttps2dq %xmm0, %xmm0
-; X64-NEXT:    movdq2q %xmm0, %mm0
+; X64-NEXT:    cvttps2pi %xmm0, %mm0
 ; X64-NEXT:    paddd %mm0, %mm0
 ; X64-NEXT:    movq %mm0, (%rdi)
 ; X64-NEXT:    retq