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Be more careful modifying the use_list while also iterating through it. 

llvm-svn: 46417
This commit is contained in:
Nick Lewycky 2008-01-27 18:35:00 +00:00
parent 053c9871cd
commit efb16f7057
2 changed files with 4 additions and 1 deletions
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3
llvm/lib/Transforms/Scalar/LoopUnroll.cpp
View File

@ -365,8 +365,9 @@ bool LoopUnroll::unrollLoop(Loop *L, unsigned Count, unsigned Threshold) {
// be updated specially after unrolling all the way.
if (*BB != LatchBlock)
for (Value::use_iterator UI = (*BB)->use_begin(), UE = (*BB)->use_end();
UI != UE; ++UI) {
UI != UE;) {
Instruction *UseInst = cast<Instruction>(*UI);
++UI;
if (isa<PHINode>(UseInst) && !L->contains(UseInst->getParent())) {
PHINode *phi = cast<PHINode>(UseInst);
Value *Incoming = phi->getIncomingValueForBlock(*BB);

2
llvm/test/Transforms/LoopUnroll/2007-11-05-Crash.ll
View File

@ -1,5 +1,7 @@
; RUN: llvm-as < %s | opt -disable-output -loop-unroll
; PR1770
; PR1947
%struct.cl_engine = type { i32, i16, i32, i8**, i8**, i8*, i8*, i8*, i8*, i8*, i8*, i8* }
%struct.cl_limits = type { i32, i32, i32, i32, i16, i64 }
%struct.cli_ac_alt = type { i8, i8*, i16, i16, %struct.cli_ac_alt* }