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add a comment, make save/restore logic more obvious.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60076 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-11-26 02:11:11 +00:00
parent 5eecb7f164
commit 653b2581df
1 changed files with 7 additions and 7 deletions
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14
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -864,22 +864,22 @@ bool AddressingModeMatcher::MatchAddr(Value *Addr, unsigned Depth) {
// Worse case, the target should support [reg] addressing modes. :)
if (!AddrMode.HasBaseReg) {
AddrMode.HasBaseReg = true;
AddrMode.BaseReg = Addr;
// Still check for legality in case the target supports [imm] but not [i+r].
if (TLI.isLegalAddressingMode(AddrMode, AccessTy)) {
AddrMode.BaseReg = Addr;
if (TLI.isLegalAddressingMode(AddrMode, AccessTy))
return true;
}
AddrMode.HasBaseReg = false;
AddrMode.BaseReg = 0;
}
// If the base register is already taken, see if we can do [r+r].
if (AddrMode.Scale == 0) {
AddrMode.Scale = 1;
if (TLI.isLegalAddressingMode(AddrMode, AccessTy)) {
AddrMode.ScaledReg = Addr;
AddrMode.ScaledReg = Addr;
if (TLI.isLegalAddressingMode(AddrMode, AccessTy))
return true;
}
AddrMode.Scale = 0;
AddrMode.ScaledReg = 0;
}
// Couldn't match.
return false;
@ -954,7 +954,7 @@ cl::opt<bool> ENABLECRAZYHACK("enable-smarter-addr-folding", cl::Hidden);
///
/// Note that this (like most of CodeGenPrepare) is just a rough heuristic. If
/// X was live across 'load Z' for other reasons, we actually *would* want to
/// fold the addressing mode in the Z case.
/// fold the addressing mode in the Z case. This would make Y die earlier.
bool AddressingModeMatcher::
IsProfitableToFoldIntoAddressingMode(Instruction *I) {
if (IgnoreProfitability || !ENABLECRAZYHACK) return true;