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Fix LSR's ExtractImmediate and ExtractSymbol to avoid calling
ScalarEvolution::getAddExpr, which can be pretty expensive, when nothing has changed, which is pretty common. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111042 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -505,12 +505,14 @@ static int64_t ExtractImmediate(const SCEV *&S, ScalarEvolution &SE) {
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} else if (const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(S)) {
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SmallVector<const SCEV *, 8> NewOps(Add->op_begin(), Add->op_end());
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int64_t Result = ExtractImmediate(NewOps.front(), SE);
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S = SE.getAddExpr(NewOps);
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if (Result != 0)
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S = SE.getAddExpr(NewOps);
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return Result;
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} else if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
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SmallVector<const SCEV *, 8> NewOps(AR->op_begin(), AR->op_end());
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int64_t Result = ExtractImmediate(NewOps.front(), SE);
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S = SE.getAddRecExpr(NewOps, AR->getLoop());
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if (Result != 0)
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S = SE.getAddRecExpr(NewOps, AR->getLoop());
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return Result;
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}
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return 0;
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@ -528,12 +530,14 @@ static GlobalValue *ExtractSymbol(const SCEV *&S, ScalarEvolution &SE) {
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} else if (const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(S)) {
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SmallVector<const SCEV *, 8> NewOps(Add->op_begin(), Add->op_end());
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GlobalValue *Result = ExtractSymbol(NewOps.back(), SE);
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S = SE.getAddExpr(NewOps);
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if (Result)
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S = SE.getAddExpr(NewOps);
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return Result;
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} else if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
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SmallVector<const SCEV *, 8> NewOps(AR->op_begin(), AR->op_end());
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GlobalValue *Result = ExtractSymbol(NewOps.front(), SE);
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S = SE.getAddRecExpr(NewOps, AR->getLoop());
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if (Result)
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S = SE.getAddRecExpr(NewOps, AR->getLoop());
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return Result;
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}
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return 0;
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