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Teach GetUnderlyingObject / BasicAA about addrspacecast

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llvm-svn: 213025
This commit is contained in:
Matt Arsenault 2014-07-15 00:56:40 +00:00
parent 91e41155de
commit 95ee145d10
4 changed files with 40 additions and 5 deletions
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3
lib/Analysis/BasicAliasAnalysis.cpp
View File

@ -309,7 +309,8 @@ DecomposeGEPExpression(const Value *V, int64_t &BaseOffs,
return V;
}
if (Op->getOpcode() == Instruction::BitCast) {
if (Op->getOpcode() == Instruction::BitCast ||
Op->getOpcode() == Instruction::AddrSpaceCast) {
V = Op->getOperand(0);
continue;
}

3
lib/Analysis/ValueTracking.cpp
View File

@ -1901,7 +1901,8 @@ llvm::GetUnderlyingObject(Value *V, const DataLayout *TD, unsigned MaxLookup) {
for (unsigned Count = 0; MaxLookup == 0 || Count < MaxLookup; ++Count) {
if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
V = GEP->getPointerOperand();
} else if (Operator::getOpcode(V) == Instruction::BitCast) {
} else if (Operator::getOpcode(V) == Instruction::BitCast ||
Operator::getOpcode(V) == Instruction::AddrSpaceCast) {
V = cast<Operator>(V)->getOperand(0);
} else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V)) {
if (GA->mayBeOverridden())

22
test/Transforms/DeadStoreElimination/PartialStore.ll
View File

@ -45,9 +45,9 @@ define void @test4(i8* %P) {
store i8 19, i8* %P ;; dead
%A = getelementptr i8* %P, i32 3
store i8 42, i8* %A ;; dead
%Q = bitcast i8* %P to double*
store double 0.0, double* %Q
ret void
@ -61,7 +61,7 @@ define void @test5(i32 %i) nounwind ssp {
%C = getelementptr i8* %B, i32 %i
store i8 10, i8* %C ;; Dead store to variable index.
store i32 20, i32* %A
call void @test5a(i32* %A)
ret void
; CHECK-LABEL: @test5(
@ -69,3 +69,19 @@ define void @test5(i32 %i) nounwind ssp {
; CHECK-NEXT: store i32 20
; CHECK-NEXT: call void @test5a
}
declare void @test5a_as1(i32*)
define void @test5_addrspacecast(i32 %i) nounwind ssp {
%A = alloca i32
%B = addrspacecast i32* %A to i8 addrspace(1)*
%C = getelementptr i8 addrspace(1)* %B, i32 %i
store i8 10, i8 addrspace(1)* %C ;; Dead store to variable index.
store i32 20, i32* %A
call void @test5a(i32* %A)
ret void
; CHECK-LABEL: @test5_addrspacecast(
; CHECK-NEXT: alloca
; CHECK-NEXT: store i32 20
; CHECK-NEXT: call void @test5a
}

17
test/Transforms/DeadStoreElimination/simple.ll
View File

@ -172,6 +172,23 @@ define i32* @test13() {
; CHECK-NEXT: call void
}
define i32 addrspace(1)* @test13_addrspacecast() {
%p = tail call i8* @malloc(i32 4)
%p.bc = bitcast i8* %p to i32*
%P = addrspacecast i32* %p.bc to i32 addrspace(1)*
%DEAD = load i32 addrspace(1)* %P
%DEAD2 = add i32 %DEAD, 1
store i32 %DEAD2, i32 addrspace(1)* %P
call void @test13f( )
store i32 0, i32 addrspace(1)* %P
ret i32 addrspace(1)* %P
; CHECK: @test13_addrspacecast()
; CHECK-NEXT: malloc
; CHECK-NEXT: bitcast
; CHECK-NEXT: addrspacecast
; CHECK-NEXT: call void
}
declare noalias i8* @malloc(i32)
declare noalias i8* @calloc(i32, i32)