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add support for PHI nodes to ObjectSizeOffsetVisitor

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llvm-svn: 171298
This commit is contained in:
Nuno Lopes 2012-12-31 13:52:36 +00:00
parent f20f04c9b6
commit aa950f7315
2 changed files with 68 additions and 3 deletions
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17
lib/Analysis/MemoryBuiltins.cpp
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@ -535,9 +535,20 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitLoadInst(LoadInst&) {
return unknown();
}
SizeOffsetType ObjectSizeOffsetVisitor::visitPHINode(PHINode&) {
// too complex to analyze statically.
return unknown();
SizeOffsetType ObjectSizeOffsetVisitor::visitPHINode(PHINode &PHI) {
if (PHI.getNumIncomingValues() == 0)
return unknown();
SizeOffsetType Ret = compute(PHI.getIncomingValue(0));
if (!bothKnown(Ret))
return unknown();
// verify that all PHI incoming pointers have the same size and offset
for (unsigned i = 1, e = PHI.getNumIncomingValues(); i != e; ++i) {
if (compute(PHI.getIncomingValue(i)) != Ret)
return unknown();
}
return Ret;
}
SizeOffsetType ObjectSizeOffsetVisitor::visitSelectInst(SelectInst &I) {

54
test/Transforms/InstCombine/objsize.ll
View File

@ -256,3 +256,57 @@ xpto:
return:
ret i32 7
}
declare noalias i8* @valloc(i32) nounwind
; CHECK: @test14
; CHECK: ret i32 6
define i32 @test14(i32 %a) nounwind {
switch i32 %a, label %sw.default [
i32 1, label %sw.bb
i32 2, label %sw.bb1
]
sw.bb:
%call = tail call noalias i8* @malloc(i32 6) nounwind
br label %sw.epilog
sw.bb1:
%call2 = tail call noalias i8* @calloc(i32 3, i32 2) nounwind
br label %sw.epilog
sw.default:
%call3 = tail call noalias i8* @valloc(i32 6) nounwind
br label %sw.epilog
sw.epilog:
%b.0 = phi i8* [ %call3, %sw.default ], [ %call2, %sw.bb1 ], [ %call, %sw.bb ]
%1 = tail call i32 @llvm.objectsize.i32(i8* %b.0, i1 false)
ret i32 %1
}
; CHECK: @test15
; CHECK: llvm.objectsize
define i32 @test15(i32 %a) nounwind {
switch i32 %a, label %sw.default [
i32 1, label %sw.bb
i32 2, label %sw.bb1
]
sw.bb:
%call = tail call noalias i8* @malloc(i32 3) nounwind
br label %sw.epilog
sw.bb1:
%call2 = tail call noalias i8* @calloc(i32 2, i32 1) nounwind
br label %sw.epilog
sw.default:
%call3 = tail call noalias i8* @valloc(i32 3) nounwind
br label %sw.epilog
sw.epilog:
%b.0 = phi i8* [ %call3, %sw.default ], [ %call2, %sw.bb1 ], [ %call, %sw.bb ]
%1 = tail call i32 @llvm.objectsize.i32(i8* %b.0, i1 false)
ret i32 %1
}