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Fix a load folding issue that Evan noticed: there is no need to export values

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used by comparisons in the main block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31279 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-10-29 18:23:37 +00:00
parent a97c67c866
commit 5a145f0094
1 changed files with 17 additions and 7 deletions
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24
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -841,12 +841,11 @@ void SelectionDAGLowering::FindMergedConditions(Value *Cond,
// caseblock.
if (BOp && isa<SetCondInst>(BOp) &&
// The operands of the setcc have to be in this block. We don't know
// how to export them from some other block.
isExportableFromCurrentBlock(BOp->getOperand(0), BB) &&
isExportableFromCurrentBlock(BOp->getOperand(1), BB)) {
ExportFromCurrentBlock(BOp->getOperand(0));
ExportFromCurrentBlock(BOp->getOperand(1));
// how to export them from some other block. If this is the first block
// of the sequence, no exporting is needed.
(CurBB == CurMBB ||
(isExportableFromCurrentBlock(BOp->getOperand(0), BB) &&
isExportableFromCurrentBlock(BOp->getOperand(1), BB)))) {
ISD::CondCode SignCond, UnsCond, FPCond, Condition;
switch (BOp->getOpcode()) {
default: assert(0 && "Unknown setcc opcode!");
@ -903,7 +902,6 @@ void SelectionDAGLowering::FindMergedConditions(Value *Cond,
SelectionDAGISel::CaseBlock CB(ISD::SETEQ, Cond, ConstantBool::getTrue(),
TBB, FBB, CurBB);
SwitchCases.push_back(CB);
ExportFromCurrentBlock(Cond);
return;
}
@ -993,6 +991,18 @@ void SelectionDAGLowering::visitBr(BranchInst &I) {
(BOp->getOpcode() == Instruction::And ||
BOp->getOpcode() == Instruction::Or)) {
FindMergedConditions(BOp, Succ0MBB, Succ1MBB, CurMBB, BOp->getOpcode());
// If the compares in later blocks need to use values not currently
// exported from this block, export them now. This block should always be
// the first entry.
assert(SwitchCases[0].ThisBB == CurMBB && "Unexpected lowering!");
for (unsigned i = 1, e = SwitchCases.size(); i != e; ++i) {
ExportFromCurrentBlock(SwitchCases[i].CmpLHS);
ExportFromCurrentBlock(SwitchCases[i].CmpRHS);
}
// Emit the branch for this block.
visitSwitchCase(SwitchCases[0]);
SwitchCases.erase(SwitchCases.begin());
return;