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Make makeLoopInvariant report whether it made any changes or not,

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and use this to simplify more code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75722 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-07-15 01:25:43 +00:00
parent 2e2ad51ffd
commit bdc017edac
5 changed files with 28 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Analysis/LoopInfo.cpp
+7 -4
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@@ -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;
}