6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-01 00:11:00 +00:00
Code Issues Projects Releases Wiki Activity

[CodeGenPrepare] Report all changes made during instruction sinking

Browse Source 
r234638 chained another transform below which was tripping over the
deleted instruction. Use after free found by asan in many regression
tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234654 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2015-04-10 22:25:36 +00:00
parent 1a6fd4d9f9
commit 306699f8ca
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/CodeGen/CodeGenPrepare.cpp
View File

@ -693,11 +693,11 @@ static bool SinkCast(CastInst *CI) {
InsertedCast =
CastInst::Create(CI->getOpcode(), CI->getOperand(0), CI->getType(), "",
InsertPt);
MadeChange = true;
}
// Replace a use of the cast with a use of the new cast.
TheUse = InsertedCast;
MadeChange = true;
++NumCastUses;
}
@ -834,17 +834,19 @@ static bool SinkCmpExpression(CmpInst *CI) {
CmpInst::Create(CI->getOpcode(),
CI->getPredicate(), CI->getOperand(0),
CI->getOperand(1), "", InsertPt);
MadeChange = true;
}
// Replace a use of the cmp with a use of the new cmp.
TheUse = InsertedCmp;
MadeChange = true;
++NumCmpUses;
}
// If we removed all uses, nuke the cmp.
if (CI->use_empty())
if (CI->use_empty()) {
CI->eraseFromParent();
MadeChange = true;
}
return MadeChange;
}