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Teach MatchScaledValue to handle Scales by 1 with MatchAddr (which
can recursively match things) and scales by 0 by ignoring them. This triggers once in 403.gcc, saving 1 (!!!!) instruction in the whole huge app. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60013 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -557,7 +557,7 @@ public:
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return Result;
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}
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private:
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bool MatchScaledValue(Value *ScaleReg, int64_t Scale);
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bool MatchScaledValue(Value *ScaleReg, int64_t Scale, unsigned Depth);
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bool MatchAddr(Value *V, unsigned Depth);
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bool MatchOperationAddr(User *Operation, unsigned Opcode, unsigned Depth);
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};
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@ -566,7 +566,17 @@ private:
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/// MatchScaledValue - Try adding ScaleReg*Scale to the current addressing mode.
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/// Return true and update AddrMode if this addr mode is legal for the target,
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/// false if not.
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bool AddressingModeMatcher::MatchScaledValue(Value *ScaleReg, int64_t Scale) {
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bool AddressingModeMatcher::MatchScaledValue(Value *ScaleReg, int64_t Scale,
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unsigned Depth) {
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// If Scale is 1, then this is the same as adding ScaleReg to the addressing
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// mode. Just process that directly.
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if (Scale == 1)
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return MatchAddr(ScaleReg, Depth);
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// If the scale is 0, it takes nothing to add this.
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if (Scale == 0)
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return true;
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// If we already have a scale of this value, we can add to it, otherwise, we
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// need an available scale field.
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if (AddrMode.Scale != 0 && AddrMode.ScaledReg != ScaleReg)
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@ -663,7 +673,7 @@ bool AddressingModeMatcher::MatchOperationAddr(User *AddrInst, unsigned Opcode,
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if (Opcode == Instruction::Shl)
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Scale = 1 << Scale;
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return MatchScaledValue(AddrInst->getOperand(0), Scale);
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return MatchScaledValue(AddrInst->getOperand(0), Scale, Depth);
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}
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case Instruction::GetElementPtr: {
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// Scan the GEP. We check it if it contains constant offsets and at most
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@ -728,8 +738,8 @@ bool AddressingModeMatcher::MatchOperationAddr(User *AddrInst, unsigned Opcode,
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// See if the scale and offset amount is valid for this target.
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AddrMode.BaseOffs += ConstantOffset;
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// FIXME: If VariableScale = 1, just call MatchAddr recursively?
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if (!MatchScaledValue(AddrInst->getOperand(VariableOperand),VariableScale)){
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if (!MatchScaledValue(AddrInst->getOperand(VariableOperand), VariableScale,
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Depth)) {
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AddrMode = BackupAddrMode;
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return false;
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}
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