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Divide the primitive size in bits by eight so the initial load's alignment is in 

bytes as expected. Tested with the included unit test.

llvm-svn: 244155
This commit is contained in:
Richard Diamond 2015-08-05 22:10:57 +00:00
parent 36e7e52aa4
commit 559c1d72a9
2 changed files with 9 additions and 1 deletions
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2
llvm/lib/CodeGen/AtomicExpandPass.cpp
View File

@ -550,7 +550,7 @@ bool llvm::expandAtomicRMWToCmpXchg(AtomicRMWInst *AI,
Builder.SetInsertPoint(BB);
LoadInst *InitLoaded = Builder.CreateLoad(Addr);
// Atomics require at least natural alignment.
InitLoaded->setAlignment(AI->getType()->getPrimitiveSizeInBits());
InitLoaded->setAlignment(AI->getType()->getPrimitiveSizeInBits() / 8);
Builder.CreateBr(LoopBB);
// Start the main loop block now that we've taken care of the preliminaries.

8
llvm/test/Transforms/AtomicExpand/expand-atomic-rmw-initial-load.ll Normal file
View File

@ -0,0 +1,8 @@
; RUN: opt -S %s -atomic-expand -mtriple=i686-linux-gnu | FileCheck %s
define i8 @test_initial_load(i8* %ptr, i8 %value) {
%res = atomicrmw nand i8* %ptr, i8 %value seq_cst
ret i8 %res
}
; CHECK-LABEL: @test_initial_load
; CHECK-NEXT: %1 = load i8, i8* %ptr, align 1