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add a comment, make save/restore logic more obvious.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60076 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -864,22 +864,22 @@ bool AddressingModeMatcher::MatchAddr(Value *Addr, unsigned Depth) {
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// Worse case, the target should support [reg] addressing modes. :)
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if (!AddrMode.HasBaseReg) {
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AddrMode.HasBaseReg = true;
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AddrMode.BaseReg = Addr;
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// Still check for legality in case the target supports [imm] but not [i+r].
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if (TLI.isLegalAddressingMode(AddrMode, AccessTy)) {
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AddrMode.BaseReg = Addr;
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if (TLI.isLegalAddressingMode(AddrMode, AccessTy))
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return true;
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}
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AddrMode.HasBaseReg = false;
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AddrMode.BaseReg = 0;
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}
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// If the base register is already taken, see if we can do [r+r].
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if (AddrMode.Scale == 0) {
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AddrMode.Scale = 1;
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if (TLI.isLegalAddressingMode(AddrMode, AccessTy)) {
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AddrMode.ScaledReg = Addr;
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AddrMode.ScaledReg = Addr;
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if (TLI.isLegalAddressingMode(AddrMode, AccessTy))
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return true;
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}
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AddrMode.Scale = 0;
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AddrMode.ScaledReg = 0;
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}
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// Couldn't match.
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return false;
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@ -954,7 +954,7 @@ cl::opt<bool> ENABLECRAZYHACK("enable-smarter-addr-folding", cl::Hidden);
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///
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/// Note that this (like most of CodeGenPrepare) is just a rough heuristic. If
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/// X was live across 'load Z' for other reasons, we actually *would* want to
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/// fold the addressing mode in the Z case.
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/// fold the addressing mode in the Z case. This would make Y die earlier.
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bool AddressingModeMatcher::
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IsProfitableToFoldIntoAddressingMode(Instruction *I) {
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if (IgnoreProfitability || !ENABLECRAZYHACK) return true;
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