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[asan] small optimization: do not emit "x+0" instructions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155701 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -363,11 +363,12 @@ void AddressSanitizer::instrumentAddress(Instruction *OrigIns,
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size_t Granularity = 1 << MappingScale;
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if (TypeSize < 8 * Granularity) {
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// Addr & (Granularity - 1)
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Value *Lower3Bits = IRB2.CreateAnd(
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Value *LastAccessedByte = IRB2.CreateAnd(
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AddrLong, ConstantInt::get(IntptrTy, Granularity - 1));
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// (Addr & (Granularity - 1)) + size - 1
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Value *LastAccessedByte = IRB2.CreateAdd(
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Lower3Bits, ConstantInt::get(IntptrTy, TypeSize / 8 - 1));
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if (TypeSize / 8 > 1)
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LastAccessedByte = IRB2.CreateAdd(
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LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1));
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// (uint8_t) ((Addr & (Granularity-1)) + size - 1)
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LastAccessedByte = IRB2.CreateIntCast(
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LastAccessedByte, IRB.getInt8Ty(), false);
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