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Look through addrspacecast in GetPointerBaseWithConstantOffset

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212999 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-07-14 22:39:22 +00:00
parent 18c3a47118
commit 19d44f6ac1
2 changed files with 15 additions and 1 deletions
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3
lib/Analysis/ValueTracking.cpp
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@ -1731,7 +1731,8 @@ Value *llvm::GetPointerBaseWithConstantOffset(Value *Ptr, int64_t &Offset,
}
Ptr = GEP->getPointerOperand();
} else if (Operator::getOpcode(Ptr) == Instruction::BitCast) {
} else if (Operator::getOpcode(Ptr) == Instruction::BitCast ||
Operator::getOpcode(Ptr) == Instruction::AddrSpaceCast) {
Ptr = cast<Operator>(Ptr)->getOperand(0);
} else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(Ptr)) {
if (GA->mayBeOverridden())

13
test/Transforms/GVN/rle.ll
View File

@ -318,6 +318,19 @@ define i8 @coerce_offset0(i32 %V, i32* %P) {
; CHECK: ret i8
}
define i8 @coerce_offset0_addrspacecast(i32 %V, i32* %P) {
store i32 %V, i32* %P
%P2 = addrspacecast i32* %P to i8 addrspace(1)*
%P3 = getelementptr i8 addrspace(1)* %P2, i32 2
%A = load i8 addrspace(1)* %P3
ret i8 %A
; CHECK-LABEL: @coerce_offset0_addrspacecast(
; CHECK-NOT: load
; CHECK: ret i8
}
;; non-local i32/float -> i8 load forwarding.
define i8 @coerce_offset_nonlocal0(i32* %P, i1 %cond) {
%P2 = bitcast i32* %P to float*