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Look through addrspacecast when checking isDereferenceablePointer

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212971 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-07-14 18:54:12 +00:00
parent bd5603c16e
commit 97555d1e20
2 changed files with 41 additions and 0 deletions
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3
lib/IR/Value.cpp
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@ -543,6 +543,9 @@ static bool isDereferenceablePointer(const Value *V, const DataLayout *DL,
return true;
}
if (const AddrSpaceCastInst *ASC = dyn_cast<AddrSpaceCastInst>(V))
return isDereferenceablePointer(ASC->getOperand(0), DL, Visited);
// If we don't know, assume the worst.
return false;
}

38
test/Transforms/LICM/hoist-bitcast-load.ll
View File

@ -78,6 +78,44 @@ for.end: ; preds = %for.inc, %entry
ret void
}
; Make sure the basic alloca pointer hoisting works through an addrspacecast
; CHECK-LABEL: @test2_addrspacecast
; CHECK: load i32 addrspace(1)* %c, align 4
; CHECK: for.body:
; Function Attrs: nounwind uwtable
define void @test2_addrspacecast(i32 addrspace(1)* nocapture %a, i32 addrspace(1)* nocapture readonly %b, i32 %n) #0 {
entry:
%cmp6 = icmp sgt i32 %n, 0
%ca = alloca i64
%c = addrspacecast i64* %ca to i32 addrspace(1)*
br i1 %cmp6, label %for.body, label %for.end
for.body: ; preds = %entry, %for.inc
%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32 addrspace(1)* %a, i64 %indvars.iv
%0 = load i32 addrspace(1)* %arrayidx, align 4
%cmp1 = icmp sgt i32 %0, 0
br i1 %cmp1, label %if.then, label %for.inc
if.then: ; preds = %for.body
%1 = load i32 addrspace(1)* %c, align 4
%arrayidx3 = getelementptr inbounds i32 addrspace(1)* %b, i64 %indvars.iv
%2 = load i32 addrspace(1)* %arrayidx3, align 4
%mul = mul nsw i32 %2, %1
store i32 %mul, i32 addrspace(1)* %arrayidx, align 4
br label %for.inc
for.inc: ; preds = %for.body, %if.then
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.inc, %entry
ret void
}
; Make sure the basic alloca pointer hoisting works through a bitcast to a
; pointer to a smaller type (where the bitcast also needs to be hoisted):
; CHECK-LABEL: @test3