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[UnifyLoopExits] Fix non-deterministic iteration order 

This was causing random minor codegen differences in shaders compiled
with the AMDGPU backend.

Differential Revision: https://reviews.llvm.org/D87548
This commit is contained in:
Jay Foad 2020-09-11 22:00:36 +01:00
parent 4946802c5f
commit 9a4476072e
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/Transforms/Utils/UnifyLoopExits.cpp
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@ -16,6 +16,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/MapVector.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/IR/Dominators.h"
#include "llvm/InitializePasses.h"
@ -80,7 +81,7 @@ static void restoreSSA(const DominatorTree &DT, const Loop *L,
const SetVector<BasicBlock *> &Incoming,
BasicBlock *LoopExitBlock) {
using InstVector = SmallVector<Instruction *, 8>;
using IIMap = DenseMap<Instruction *, InstVector>;
using IIMap = MapVector<Instruction *, InstVector>;
IIMap ExternalUsers;
for (auto BB : L->blocks()) {
for (auto &I : *BB) {