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Relax an assert a bit to avoid a crash on unreachable code.

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Patch by Duncan Exon Smith with a small tweak by me.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222984 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-12-01 02:55:24 +00:00
parent 186abcb853
commit 6c8ce66b03
2 changed files with 21 additions and 1 deletions
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2
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -1361,7 +1361,7 @@ getNonLocalPointerDepFromBB(const PHITransAddr &Pointer,
if (I->getBB() != BB) if (I->getBB() != BB)
continue; continue;
assert(I->getResult().isNonLocal() && assert((I->getResult().isNonLocal() || !DT->isReachableFromEntry(BB)) &&
"Should only be here with transparent block"); "Should only be here with transparent block");
I->setResult(MemDepResult::getUnknown()); I->setResult(MemDepResult::getUnknown());
Result.push_back(NonLocalDepResult(I->getBB(), I->getResult(), Result.push_back(NonLocalDepResult(I->getBB(), I->getResult(),

20
test/Transforms/GVN/load-from-unreachable-predecessor.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: opt -gvn -S < %s | FileCheck %s
; Check that an unreachable predecessor to a PHI node doesn't cause a crash.
; PR21625.
define i32 @f(i32** %f) {
; CHECK: bb0:
; Load should be removed, since it's ignored.
; CHECK-NEXT: br label
bb0:
%bar = load i32** %f
br label %bb2
bb1:
%zed = load i32** %f
br i1 false, label %bb1, label %bb2
bb2:
%foo = phi i32* [ null, %bb0 ], [ %zed, %bb1 ]
%storemerge = load i32* %foo
ret i32 %storemerge
}