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LICM pass now understands invariant load metadata. Nothing generates this yet so it will currently never get used in real tests

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144107 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper 2011-11-08 19:30:00 +00:00
parent 67a917d495
commit 2d76a78462
2 changed files with 41 additions and 0 deletions
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2
lib/Transforms/Scalar/LICM.cpp
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@ -369,6 +369,8 @@ bool LICM::canSinkOrHoistInst(Instruction &I) {
// in the same alias set as something that ends up being modified.
if (AA->pointsToConstantMemory(LI->getOperand(0)))
return true;
if (LI->getMetadata(LI->getContext().getMDKindID("invariant.load")))
return true;
// Don't hoist loads which have may-aliased stores in loop.
uint64_t Size = 0;

39
test/Transforms/LICM/hoist-invariant-load.ll Normal file
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@ -0,0 +1,39 @@
; RUN: opt < %s -licm -stats -S |& grep "1 licm"
@"\01L_OBJC_METH_VAR_NAME_" = internal global [4 x i8] c"foo\00", section "__TEXT,__objc_methname,cstring_literals", align 1
@"\01L_OBJC_SELECTOR_REFERENCES_" = internal global i8* getelementptr inbounds ([4 x i8]* @"\01L_OBJC_METH_VAR_NAME_", i32 0, i32 0), section "__DATA, __objc_selrefs, literal_pointers, no_dead_strip"
@"\01L_OBJC_IMAGE_INFO" = internal constant [2 x i32] [i32 0, i32 16], section "__DATA, __objc_imageinfo, regular, no_dead_strip"
@llvm.used = appending global [3 x i8*] [i8* getelementptr inbounds ([4 x i8]* @"\01L_OBJC_METH_VAR_NAME_", i32 0, i32 0), i8* bitcast (i8** @"\01L_OBJC_SELECTOR_REFERENCES_" to i8*), i8* bitcast ([2 x i32]* @"\01L_OBJC_IMAGE_INFO" to i8*)], section "llvm.metadata"
define void @test(i8* %x) uwtable ssp {
entry:
%x.addr = alloca i8*, align 8
%i = alloca i32, align 4
store i8* %x, i8** %x.addr, align 8
store i32 0, i32* %i, align 4
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%0 = load i32* %i, align 4
%cmp = icmp ult i32 %0, 10000
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%1 = load i8** %x.addr, align 8
%2 = load i8** @"\01L_OBJC_SELECTOR_REFERENCES_", !invariant.load !0
%call = call i8* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to i8* (i8*, i8*)*)(i8* %1, i8* %2)
br label %for.inc
for.inc: ; preds = %for.body
%3 = load i32* %i, align 4
%inc = add i32 %3, 1
store i32 %inc, i32* %i, align 4
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
declare i8* @objc_msgSend(i8*, i8*, ...) nonlazybind
!0 = metadata !{}