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Have isel visit blocks in reverse postorder rather than an undefined order. This

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allows for the information propagated across basic blocks to be merged at phis.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126375 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2011-02-24 10:00:04 +00:00
parent afbf48363a
commit 2dbe2850d0
1 changed files with 5 additions and 2 deletions
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7
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -49,6 +49,7 @@
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/Statistic.h"
#include <algorithm>
using namespace llvm;
@ -832,8 +833,10 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
FastIS = TLI.createFastISel(*FuncInfo);
// Iterate over all basic blocks in the function.
for (Function::const_iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
const BasicBlock *LLVMBB = &*I;
ReversePostOrderTraversal<const Function*> RPOT(&Fn);
for (ReversePostOrderTraversal<const Function*>::rpo_iterator
I = RPOT.begin(), E = RPOT.end(); I != E; ++I) {
const BasicBlock *LLVMBB = *I;
#ifndef NDEBUG
CheckLineNumbers(LLVMBB);
#endif