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Lift the integer splat computation into a helper function.
No functionality changed. Refactoring leading up to the fix for PR14478 which requires some significant changes to the memset and memcpy rewriting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170299 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2639,6 +2639,33 @@ private:
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return NewSI->getPointerOperand() == &NewAI && !SI.isVolatile();
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}
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/// \brief Compute an integer value from splatting an i8 across the given
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/// number of bytes.
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///
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/// Note that this routine assumes an i8 is a byte. If that isn't true, don't
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/// call this routine.
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/// FIXME: Heed the abvice above.
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///
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/// \param V The i8 value to splat.
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/// \param Size The number of bytes in the output (assuming i8 is one byte)
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Value *getIntegerSplat(IRBuilder<> &IRB, Value *V, unsigned Size) {
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assert(Size > 0 && "Expected a positive number of bytes.");
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IntegerType *VTy = cast<IntegerType>(V->getType());
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assert(VTy->getBitWidth() == 8 && "Expected an i8 value for the byte");
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if (Size == 1)
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return V;
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Type *SplatIntTy = Type::getIntNTy(VTy->getContext(), Size*8);
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V = IRB.CreateMul(IRB.CreateZExt(V, SplatIntTy, getName(".zext")),
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ConstantExpr::getUDiv(
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Constant::getAllOnesValue(SplatIntTy),
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ConstantExpr::getZExt(
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Constant::getAllOnesValue(V->getType()),
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SplatIntTy)),
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getName(".isplat"));
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return V;
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}
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bool visitMemSetInst(MemSetInst &II) {
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DEBUG(dbgs() << " original: " << II << "\n");
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IRBuilder<> IRB(&II);
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@ -2686,17 +2713,7 @@ private:
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// splatting the byte to a sufficiently wide integer, bitcasting to the
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// desired scalar type, and splatting it across any desired vector type.
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uint64_t Size = EndOffset - BeginOffset;
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Value *V = II.getValue();
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IntegerType *VTy = cast<IntegerType>(V->getType());
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Type *SplatIntTy = Type::getIntNTy(VTy->getContext(), Size*8);
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if (Size*8 > VTy->getBitWidth())
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V = IRB.CreateMul(IRB.CreateZExt(V, SplatIntTy, getName(".zext")),
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ConstantExpr::getUDiv(
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Constant::getAllOnesValue(SplatIntTy),
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ConstantExpr::getZExt(
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Constant::getAllOnesValue(V->getType()),
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SplatIntTy)),
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getName(".isplat"));
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Value *V = getIntegerSplat(IRB, II.getValue(), Size);
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// If this is an element-wide memset of a vectorizable alloca, insert it.
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if (VecTy && (BeginOffset > NewAllocaBeginOffset ||
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