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| author | Manman Ren <mren@apple.com> | 2012-08-02 19:37:32 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2012-08-02 19:37:32 +0000 |
| commit | 127eea87d666ccc9fe7025f41148c33af0f8c84b (patch) | |
| tree | 97b08e6625f5465adbdee33975e86a496bc85af8 /include/llvm | |
| parent | 1de266be13c956f4af9566b000b67ef75454d0a8 (diff) | |
| download | external_llvm-127eea87d666ccc9fe7025f41148c33af0f8c84b.zip external_llvm-127eea87d666ccc9fe7025f41148c33af0f8c84b.tar.gz external_llvm-127eea87d666ccc9fe7025f41148c33af0f8c84b.tar.bz2 | |
X86 Peephole: fold loads to the source register operand if possible.
Add more comments and use early returns to reduce nesting in isLoadFoldable.
Also disable folding for V_SET0 to avoid introducing a const pool entry and
a const pool load.
rdar://10554090 and rdar://11873276
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161207 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm')
| -rw-r--r-- | include/llvm/Target/TargetInstrInfo.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h index cfb9dd7..850eccc 100644 --- a/include/llvm/Target/TargetInstrInfo.h +++ b/include/llvm/Target/TargetInstrInfo.h @@ -696,7 +696,11 @@ public: /// optimizeLoadInstr - Try to remove the load by folding it to a register /// operand at the use. We fold the load instructions if and only if the - /// def and use are in the same BB. + /// def and use are in the same BB. We only look at one load and see + /// whether it can be folded into MI. FoldAsLoadDefReg is the virtual register + /// defined by the load we are trying to fold. DefMI returns the machine + /// instruction that defines FoldAsLoadDefReg, and the function returns + /// the machine instruction generated due to folding. virtual MachineInstr* optimizeLoadInstr(MachineInstr *MI, const MachineRegisterInfo *MRI, unsigned &FoldAsLoadDefReg, |