[llvm] r229298 - [x86] Make computing the zeroable elements slightly more powerful, at

[Chandler Carruth]

Author: chandlerc
Date: Sun Feb 15 03:33:36 2015
New Revision: 229298

URL: http://llvm.org/viewvc/llvm-project?rev=229298&view=rev
Log:
[x86] Make computing the zeroable elements slightly more powerful, at
least in theory.

I don't actually have a test case that benefits from this, but
theoretically, it could come up, and I don't want to try to think about
whether this is the culprit or something else is, so I'd rather just
make this code powerful. =/ Makes me sad that I can't really test it
though.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=229298&r1=229297&r2=229298&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Sun Feb 15 03:33:36 2015
@@ -7735,6 +7735,11 @@ static SmallBitVector computeZeroableShu
                                                      SDValue V1, SDValue V2) {
   SmallBitVector Zeroable(Mask.size(), false);
 
+  while (V1.getOpcode() == ISD::BITCAST)
+    V1 = V1->getOperand(0);
+  while (V2.getOpcode() == ISD::BITCAST)
+    V2 = V2->getOperand(0);
+
   bool V1IsZero = ISD::isBuildVectorAllZeros(V1.getNode());
   bool V2IsZero = ISD::isBuildVectorAllZeros(V2.getNode());
 
@@ -7746,10 +7751,10 @@ static SmallBitVector computeZeroableShu
       continue;
     }
 
-    // If this is an index into a build_vector node, dig out the input value and
-    // use it.
+    // If this is an index into a build_vector node (which has the same number
+    // of elements), dig out the input value and use it.
     SDValue V = M < Size ? V1 : V2;
-    if (V.getOpcode() != ISD::BUILD_VECTOR)
+    if (V.getOpcode() != ISD::BUILD_VECTOR || Size != (int)V.getNumOperands())
       continue;
 
     SDValue Input = V.getOperand(M % Size);