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Added IRBuilder::SetInsertPoint(Use) to find a valid insertion point 

that dominates the given Use.

llvm-svn: 134111
This commit is contained in:
Andrew Trick 2011-06-29 23:01:52 +00:00
parent f0f9f45087
commit e98e9a1540
1 changed files with 19 additions and 0 deletions
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19
llvm/include/llvm/Support/IRBuilder.h
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@ -90,6 +90,19 @@ public:
InsertPt = IP;
}
/// SetInsertPoint(Use) - Find the nearest point that dominates this use, and
/// specify that created instructions should be inserted at this point.
void SetInsertPoint(Use &U) {
Instruction *UseInst = cast<Instruction>(U.getUser());
if (PHINode *Phi = dyn_cast<PHINode>(UseInst)) {
BasicBlock *PredBB = Phi->getIncomingBlock(U);
assert(U != PredBB->getTerminator() && "critical edge not split");
SetInsertPoint(PredBB, PredBB->getTerminator());
return;
}
SetInsertPoint(UseInst);
}
/// SetCurrentDebugLocation - Set location information used by debugging
/// information.
void SetCurrentDebugLocation(const DebugLoc &L) {
@ -342,6 +355,12 @@ public:
SetCurrentDebugLocation(IP->getDebugLoc());
}
explicit IRBuilder(Use &U)
: IRBuilderBase(U->getContext()), Folder() {
SetInsertPoint(U);
SetCurrentDebugLocation(cast<Instruction>(U.getUser())->getDebugLoc());
}
IRBuilder(BasicBlock *TheBB, BasicBlock::iterator IP, const T& F)
: IRBuilderBase(TheBB->getContext()), Folder(F) {
SetInsertPoint(TheBB, IP);