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Teach computeKnownBits to use new align attribute/metadata

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Reviewed By: reames

Differential Revision: http://reviews.llvm.org/D13470

llvm-svn: 249557
This commit is contained in:
Artur Pilipenko 2015-10-07 16:01:18 +00:00
parent 18e0c425d4
commit 8b3cc14fdc
2 changed files with 38 additions and 3 deletions
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15
lib/Analysis/ValueTracking.cpp
View File

@ -1415,7 +1415,7 @@ static void computeKnownBitsFromOperator(Operator *I, APInt &KnownZero,
}
}
static unsigned getAlignment(Value *V, const DataLayout &DL) {
static unsigned getAlignment(const Value *V, const DataLayout &DL) {
unsigned Align = 0;
if (auto *GO = dyn_cast<GlobalObject>(V)) {
Align = GO->getAlignment();
@ -1433,7 +1433,7 @@ static unsigned getAlignment(Value *V, const DataLayout &DL) {
}
}
}
} else if (Argument *A = dyn_cast<Argument>(V)) {
} else if (const Argument *A = dyn_cast<Argument>(V)) {
Align = A->getType()->isPointerTy() ? A->getParamAlignment() : 0;
if (!Align && A->hasStructRetAttr()) {
@ -1442,7 +1442,16 @@ static unsigned getAlignment(Value *V, const DataLayout &DL) {
if (EltTy->isSized())
Align = DL.getABITypeAlignment(EltTy);
}
}
} else if (const AllocaInst *AI = dyn_cast<AllocaInst>(V))
Align = AI->getAlignment();
else if (auto CS = ImmutableCallSite(V))
Align = CS.getAttributes().getParamAlignment(AttributeSet::ReturnIndex);
else if (const LoadInst *LI = dyn_cast<LoadInst>(V))
if (MDNode *MD = LI->getMetadata(LLVMContext::MD_align)) {
ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
Align = CI->getLimitedValue();
}
return Align;
}

26
test/Transforms/InstCombine/assume-redundant.ll
View File

@ -47,6 +47,32 @@ for.end: ; preds = %for.body
ret void
}
declare align 8 i8* @get()
; Check that redundant align assume is removed
; CHECK-LABEL: @test
; CHECK-NOT: call void @llvm.assume
define void @test1() {
%p = call align 8 i8* @get()
%ptrint = ptrtoint i8* %p to i64
%maskedptr = and i64 %ptrint, 7
%maskcond = icmp eq i64 %maskedptr, 0
call void @llvm.assume(i1 %maskcond)
ret void
}
; Check that redundant align assume is removed
; CHECK-LABEL: @test
; CHECK-NOT: call void @llvm.assume
define void @test3() {
%p = alloca i8, align 8
%ptrint = ptrtoint i8* %p to i64
%maskedptr = and i64 %ptrint, 7
%maskcond = icmp eq i64 %maskedptr, 0
call void @llvm.assume(i1 %maskcond)
ret void
}
; Function Attrs: nounwind
declare void @llvm.assume(i1) #1