http://llvm.org/bugs/show_bug.cgi?id=11290
Bug #: 11290
Summary: Alignment of loads over conservative in
CodeGenFunction::EmitCall.
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
The alignment of the load instruction created in line CGCall.cpp:1701 is always
set to 1 in line 1704.
01700 for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
01701 llvm::Value *EltPtr = Builder.CreateConstGEP2_32(SrcPtr, 0, i);
01702 llvm::LoadInst *LI = Builder.CreateLoad(EltPtr);
01703 // We don't know what we're loading from.
01704 LI->setAlignment(1);
The alignment is overconservative and can be made stricter since the alignment
of the underlying object and the sizes of its fields are known here.
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