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| author | Dan Gohman <gohman@apple.com> | 2009-07-15 01:25:43 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-07-15 01:25:43 +0000 |
| commit | c80f52443574008d2051dbbcfdf3ddbe29d49b0d (patch) | |
| tree | 7cf92dc3dd53533075ad262c08ec0d23e0dd7e1d /lib/Analysis | |
| parent | 0b05e54b3599d7bdaa289a41e90a1b2e311748c6 (diff) | |
| download | external_llvm-c80f52443574008d2051dbbcfdf3ddbe29d49b0d.zip external_llvm-c80f52443574008d2051dbbcfdf3ddbe29d49b0d.tar.gz external_llvm-c80f52443574008d2051dbbcfdf3ddbe29d49b0d.tar.bz2 | |
Make makeLoopInvariant report whether it made any changes or not,
and use this to simplify more code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75722 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis')
| -rw-r--r-- | lib/Analysis/LoopInfo.cpp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/Analysis/LoopInfo.cpp b/lib/Analysis/LoopInfo.cpp index fb8027c..63de1aa 100644 --- a/lib/Analysis/LoopInfo.cpp +++ b/lib/Analysis/LoopInfo.cpp @@ -58,9 +58,10 @@ bool Loop::isLoopInvariant(Instruction *I) const { /// If InsertPt is specified, it is the point to hoist instructions to. /// If null, the terminator of the loop preheader is used. /// -bool Loop::makeLoopInvariant(Value *V, Instruction *InsertPt) const { +bool Loop::makeLoopInvariant(Value *V, bool &Changed, + Instruction *InsertPt) const { if (Instruction *I = dyn_cast<Instruction>(V)) - return makeLoopInvariant(I); + return makeLoopInvariant(I, Changed, InsertPt); return true; // All non-instructions are loop-invariant. } @@ -73,7 +74,8 @@ bool Loop::makeLoopInvariant(Value *V, Instruction *InsertPt) const { /// If InsertPt is specified, it is the point to hoist instructions to. /// If null, the terminator of the loop preheader is used. /// -bool Loop::makeLoopInvariant(Instruction *I, Instruction *InsertPt) const { +bool Loop::makeLoopInvariant(Instruction *I, bool &Changed, + Instruction *InsertPt) const { // Test if the value is already loop-invariant. if (isLoopInvariant(I)) return true; @@ -96,10 +98,11 @@ bool Loop::makeLoopInvariant(Instruction *I, Instruction *InsertPt) const { } // Don't hoist instructions with loop-variant operands. for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) - if (!makeLoopInvariant(I->getOperand(i), InsertPt)) + if (!makeLoopInvariant(I->getOperand(i), Changed, InsertPt)) return false; // Hoist. I->moveBefore(InsertPt); + Changed = true; return true; } |