Clang changes for alloc_align attribute
GCC has the alloc_align attribute, which is similar to assume_aligned, except the attribute's parameter is the index of the integer parameter that needs aligning to.
Differential Revision: https://reviews.llvm.org/D29599
llvm-svn: 299117
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 55191b2..e11bc94 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -4348,6 +4348,10 @@
llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(Alignment);
EmitAlignmentAssumption(Ret.getScalarVal(), AlignmentCI->getZExtValue(),
OffsetValue);
+ } else if (const auto *AA = TargetDecl->getAttr<AllocAlignAttr>()) {
+ llvm::Value *ParamVal =
+ CallArgs[AA->getParamIndex() - 1].RV.getScalarVal();
+ EmitAlignmentAssumption(Ret.getScalarVal(), ParamVal);
}
}
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 4a7cc02..ee85e30 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -2465,6 +2465,12 @@
PeepholeProtection protectFromPeepholes(RValue rvalue);
void unprotectFromPeepholes(PeepholeProtection protection);
+ void EmitAlignmentAssumption(llvm::Value *PtrValue, llvm::Value *Alignment,
+ llvm::Value *OffsetValue = nullptr) {
+ Builder.CreateAlignmentAssumption(CGM.getDataLayout(), PtrValue, Alignment,
+ OffsetValue);
+ }
+
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