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IRBuilder: Add RAII objects to reset insertion points or fast math flags.

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Inspired by the object from the SLPVectorizer. This found a minor bug in the
debug loc restoration in the vectorizer where the location of a following
instruction was attached instead of the location from the original instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191673 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2013-09-30 15:39:48 +00:00
parent 5a17a462cd
commit adb412daa4
4 changed files with 86 additions and 22 deletions
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22
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -65,26 +65,6 @@ static const unsigned MinVecRegSize = 128;
static const unsigned RecursionMaxDepth = 12;
/// RAII pattern to save the insertion point of the IR builder.
class BuilderLocGuard {
public:
BuilderLocGuard(IRBuilder<> &B) : Builder(B), Loc(B.GetInsertPoint()),
DbgLoc(B.getCurrentDebugLocation()) {}
~BuilderLocGuard() {
Builder.SetCurrentDebugLocation(DbgLoc);
if (Loc)
Builder.SetInsertPoint(Loc);
}
private:
// Prevent copying.
BuilderLocGuard(const BuilderLocGuard &);
BuilderLocGuard &operator=(const BuilderLocGuard &);
IRBuilder<> &Builder;
AssertingVH<Instruction> Loc;
DebugLoc DbgLoc;
};
/// A helper class for numbering instructions in multiple blocks.
/// Numbers start at zero for each basic block.
struct BlockNumbering {
@ -1177,7 +1157,7 @@ Value *BoUpSLP::vectorizeTree(ArrayRef<Value *> VL) {
}
Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
BuilderLocGuard Guard(Builder);
IRBuilder<>::InsertPointGuard Guard(Builder);
if (E->VectorizedValue) {
DEBUG(dbgs() << "SLP: Diamond merged for " << *E->Scalars[0] << ".\n");