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[LoopUnrollAnalyzer] Fix a crash in UnrolledInstAnalyzer::visitCastInst.

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This fixes PR27847.

llvm-svn: 270517
This commit is contained in:
Michael Zolotukhin 2016-05-24 00:51:01 +00:00
parent 5844629626
commit 32f621fe89
2 changed files with 26 additions and 2 deletions
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7
lib/Analysis/LoopUnrollAnalyzer.cpp
View File

@ -141,12 +141,17 @@ bool UnrolledInstAnalyzer::visitCastInst(CastInst &I) {
Constant *COp = dyn_cast<Constant>(I.getOperand(0));
if (!COp)
COp = SimplifiedValues.lookup(I.getOperand(0));
if (COp)
if (COp) {
if (COp->getType() == I.getType()) {
SimplifiedValues[&I] = cast<Constant>(COp);
return true;
}
if (Constant *C =
ConstantExpr::getCast(I.getOpcode(), COp, I.getType())) {
SimplifiedValues[&I] = C;
return true;
}
}
return Base::visitCastInst(I);
}

21
test/Transforms/LoopUnroll/full-unroll-crashers.ll
View File

@ -1,5 +1,5 @@
; Check that we don't crash on corner cases.
; RUN: opt < %s -S -loop-unroll -unroll-max-iteration-count-to-analyze=1000 -unroll-threshold=10 -unroll-percent-dynamic-cost-saved-threshold=20 -o /dev/null
; RUN: opt < %s -S -loop-unroll -unroll-max-iteration-count-to-analyze=1000 -unroll-threshold=1 -unroll-percent-dynamic-cost-saved-threshold=20 -o /dev/null
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
@known_constant = internal unnamed_addr constant [10 x i32] [i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1], align 16
@ -100,3 +100,22 @@ for.body:
for.exit:
ret <4 x i32> %r
}
define void @ptrtoint_cast() optsize {
entry:
br label %for.body
for.body:
br i1 true, label %for.inc, label %if.then
if.then:
%arraydecay = getelementptr inbounds [1 x i32], [1 x i32]* null, i64 0, i64 0
%x = ptrtoint i32* %arraydecay to i64
br label %for.inc
for.inc:
br i1 false, label %for.body, label %for.cond.cleanup
for.cond.cleanup:
ret void
}