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X86 Peephole: fold loads to the source register operand if possible.

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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
This commit is contained in:
Manman Ren
2012-08-02 19:37:32 +00:00
parent 1de266be13
commit 127eea87d6
5 changed files with 67 additions and 38 deletions
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6
lib/Target/X86/X86InstrInfo.h
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@@ -389,7 +389,11 @@ 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,