[llvm] r344924 - [X86] getTargetConstantBitsFromNode - handle extraction from larger constant pool entries

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Mon Oct 22 10:43:33 2018
New Revision: 344924

URL: http://llvm.org/viewvc/llvm-project?rev=344924&view=rev
Log:
[X86] getTargetConstantBitsFromNode - handle extraction from larger constant pool entries

First step towards removing X86ShuffleDecodeConstantPool usage from X86ISelLowering.cpp

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=344924&r1=344923&r2=344924&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Mon Oct 22 10:43:33 2018
@@ -5694,11 +5694,12 @@ static bool getTargetConstantBitsFromNod
   // Extract constant bits from constant pool vector.
   if (auto *Cst = getTargetConstantFromNode(Op)) {
     Type *CstTy = Cst->getType();
-    if (!CstTy->isVectorTy() || (SizeInBits != CstTy->getPrimitiveSizeInBits()))
+    unsigned CstSizeInBits = CstTy->getPrimitiveSizeInBits();
+    if (!CstTy->isVectorTy() || (CstSizeInBits % SizeInBits) != 0)
       return false;
 
     unsigned SrcEltSizeInBits = CstTy->getScalarSizeInBits();
-    unsigned NumSrcElts = CstTy->getVectorNumElements();
+    unsigned NumSrcElts = SizeInBits / SrcEltSizeInBits;
 
     APInt UndefSrcElts(NumSrcElts, 0);
     SmallVector<APInt, 64> SrcEltBits(NumSrcElts, APInt(SrcEltSizeInBits, 0));