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Implement depth_first and inverse_depth_first range factory functions.

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Also updated as many loops as I could find using df_begin/idf_begin -
strangely I found no uses of idf_begin. Is that just used out of tree?

Also a few places couldn't use df_begin because either they used the
member functions of the depth first iterators or had specific ordering
constraints (I added a comment in the latter case).

Based on a patch by Jim Grosbach. (Jim - you just had iterator_range<T>
where you needed iterator_range<idf_iterator<T>>)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206016 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2014-04-11 01:50:01 +00:00
parent ae64ab542a
commit 77cf856e56
10 changed files with 45 additions and 45 deletions
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7
lib/Transforms/Utils/SimplifyInstructions.cpp
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@ -55,9 +55,10 @@ namespace {
bool Changed = false;
do {
for (df_iterator<BasicBlock*> DI = df_begin(&F.getEntryBlock()),
DE = df_end(&F.getEntryBlock()); DI != DE; ++DI)
for (BasicBlock::iterator BI = DI->begin(), BE = DI->end(); BI != BE;) {
for (BasicBlock *BB : depth_first(&F.getEntryBlock()))
// Here be subtlety: the iterator must be incremented before the loop
// body (not sure why), so a range-for loop won't work here.
for (BasicBlock::iterator BI = BB->begin(), BE = BB->end(); BI != BE;) {
Instruction *I = BI++;
// The first time through the loop ToSimplify is empty and we try to
// simplify all instructions. On later iterations ToSimplify is not