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implement SSAUpdater::RewriteUseAfterInsertions, a helpful form of RewriteUse.

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llvm-svn: 112409
This commit is contained in:
Chris Lattner 2010-08-29 04:54:06 +00:00
parent 24927beaff
commit fac07b1dca
2 changed files with 22 additions and 0 deletions
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6
include/llvm/Transforms/Utils/SSAUpdater.h
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@ -94,6 +94,12 @@ public:
/// for the use's block will be considered to be below it.
void RewriteUse(Use &U);
/// RewriteUseAfterInsertions - Rewrite a use, just like RewriteUse. However,
/// this version of the method can rewrite uses in the same block as a
/// definition, because it assumes that all uses of a value are below any
/// inserted values.
void RewriteUseAfterInsertions(Use &U);
private:
Value *GetValueAtEndOfBlockInternal(BasicBlock *BB);

16
lib/Transforms/Utils/SSAUpdater.cpp
View File

@ -205,6 +205,22 @@ void SSAUpdater::RewriteUse(Use &U) {
U.set(V);
}
/// RewriteUseAfterInsertions - Rewrite a use, just like RewriteUse. However,
/// this version of the method can rewrite uses in the same block as a
/// definition, because it assumes that all uses of a value are below any
/// inserted values.
void SSAUpdater::RewriteUseAfterInsertions(Use &U) {
Instruction *User = cast<Instruction>(U.getUser());
Value *V;
if (PHINode *UserPN = dyn_cast<PHINode>(User))
V = GetValueAtEndOfBlock(UserPN->getIncomingBlock(U));
else
V = GetValueAtEndOfBlock(User->getParent());
U.set(V);
}
/// PHIiter - Iterator for PHI operands. This is used for the PHI_iterator
/// in the SSAUpdaterImpl template.
namespace {