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[LIR] Fix mis-compilation with unwinding.

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To fix PR27859, bail out if there is an instruction may throw.

Differential Revision: http://reviews.llvm.org/D20638

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274673 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Haicheng Wu 2016-07-06 21:05:40 +00:00
parent d6ed0ff57a
commit 41ba9f90b7
2 changed files with 41 additions and 0 deletions
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8
lib/Transforms/Scalar/LoopIdiomRecognize.cpp
View File

@ -216,6 +216,14 @@ bool LoopIdiomRecognize::runOnCountableLoop() {
<< CurLoop->getHeader()->getName() << "\n"); << CurLoop->getHeader()->getName() << "\n");
bool MadeChange = false; bool MadeChange = false;
// The following transforms hoist stores/memsets into the loop pre-header.
// Give up if the loop has instructions may throw.
LoopSafetyInfo SafetyInfo;
computeLoopSafetyInfo(&SafetyInfo, CurLoop);
if (SafetyInfo.MayThrow)
return MadeChange;
// Scan all the blocks in the loop that are not in subloops. // Scan all the blocks in the loop that are not in subloops.
for (auto *BB : CurLoop->getBlocks()) { for (auto *BB : CurLoop->getBlocks()) {
// Ignore blocks in subloops. // Ignore blocks in subloops.

33
test/Transforms/LoopIdiom/unwind.ll Normal file
View File

@ -0,0 +1,33 @@
; RUN: opt -loop-idiom < %s -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare void @ff()
define void @test(i8* noalias nocapture %base, i64 %size) #1 {
entry:
%cmp3 = icmp eq i64 %size, 0
br i1 %cmp3, label %for.end, label %for.body.preheader
for.body.preheader: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body.preheader, %for.body
; CHECK-LABEL: @test(
; CHECK-NOT: llvm.memset
%indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
tail call void @ff()
%arrayidx = getelementptr inbounds i8, i8* %base, i64 %indvars.iv
store i8 0, i8* %arrayidx, align 1
%indvars.iv.next = add i64 %indvars.iv, 1
%exitcond = icmp ne i64 %indvars.iv.next, %size
br i1 %exitcond, label %for.body, label %for.end.loopexit
for.end.loopexit: ; preds = %for.body
br label %for.end
for.end: ; preds = %for.end.loopexit, %entry
ret void
}
attributes #1 = { uwtable }