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Check for the correct size in the invariant marker. 

llvm-svn: 151003
This commit is contained in:
Nick Lewycky 2012-02-20 23:32:26 +00:00
parent 63618f9ba6
commit 519561f418
2 changed files with 37 additions and 8 deletions
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11
llvm/lib/Transforms/IPO/GlobalOpt.cpp
View File

@ -2511,10 +2511,13 @@ bool Evaluator::EvaluateBlock(BasicBlock::iterator CurInst,
if (!II->use_empty())
return false;
ConstantInt *Size = cast<ConstantInt>(II->getArgOperand(0));
if (Size->isAllOnesValue()) {
Value *PtrArg = getVal(II->getArgOperand(1));
Value *Ptr = PtrArg->stripPointerCasts();
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Ptr))
Value *PtrArg = getVal(II->getArgOperand(1));
Value *Ptr = PtrArg->stripPointerCasts();
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Ptr)) {
Type *ElemTy = cast<PointerType>(GV->getType())->getElementType();
if (!Size->isAllOnesValue() &&
Size->getValue().getLimitedValue() >=
TD->getTypeStoreSize(ElemTy))
Invariants.insert(GV);
}
// Continue even if we do nothing.

34
llvm/test/Transforms/GlobalOpt/invariant.ll
View File

@ -1,9 +1,12 @@
; RUN: opt -globalopt -S -o - < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare {}* @llvm.invariant.start(i64 %size, i8* nocapture %ptr)
define void @test1(i8* %ptr) {
call {}* @llvm.invariant.start(i64 -1, i8* %ptr)
call {}* @llvm.invariant.start(i64 4, i8* %ptr)
ret void
}
@ -22,12 +25,35 @@ define void @ctor1() {
define void @ctor2() {
store i32 -1, i32* @object2
%A = bitcast i32* @object2 to i8*
%B = call {}* @llvm.invariant.start(i64 -1, i8* %A)
%B = call {}* @llvm.invariant.start(i64 4, i8* %A)
%C = bitcast {}* %B to i8*
ret void
}
@object3 = global i32 0
; CHECK: @object3 = global i32 -1
define void @ctor3() {
store i32 -1, i32* @object3
%A = bitcast i32* @object3 to i8*
call {}* @llvm.invariant.start(i64 3, i8* %A)
ret void
}
@object4 = global i32 0
; CHECK: @object4 = global i32 -1
define void @ctor4() {
store i32 -1, i32* @object4
%A = bitcast i32* @object4 to i8*
call {}* @llvm.invariant.start(i64 -1, i8* %A)
ret void
}
@llvm.global_ctors = appending constant
[2 x { i32, void ()* }]
[4 x { i32, void ()* }]
[ { i32, void ()* } { i32 65535, void ()* @ctor1 },
{ i32, void ()* } { i32 65535, void ()* @ctor2 } ]
{ i32, void ()* } { i32 65535, void ()* @ctor2 },
{ i32, void ()* } { i32 65535, void ()* @ctor3 },
{ i32, void ()* } { i32 65535, void ()* @ctor4 } ]