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- Added a hook processFunctionBeforeCalleeSaveScn(). This is called by PEI just

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before it determines which callee-save registers are to be spilled. This allows
the target to make changes such as forcing certain physical registers to be
spilled.
- Modified comments. It's important to note the order of registers in the array
returns by getCalleeSaveRegs() determines the order of callee save spill code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30635 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-09-28 00:07:19 +00:00
parent 31cefb9943
commit 02569d7355
1 changed files with 10 additions and 4 deletions
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14
include/llvm/Target/MRegisterInfo.h
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@ -283,7 +283,9 @@ public:
}
/// getCalleeSaveRegs - Return a null-terminated list of all of the
/// callee-save registers on this target.
/// callee-save registers on this target. The register should be in the
/// order of desired callee-save stack frame offset. The first register is
/// closed to the incoming stack pointer if stack grows down, and vice versa.
virtual const unsigned* getCalleeSaveRegs() const = 0;
/// getCalleeSaveRegClasses - Return a null-terminated list of the preferred
@ -371,12 +373,16 @@ public:
assert(0 && "Call Frame Pseudo Instructions do not exist on this target!");
}
/// processFunctionBeforeCalleeSaveScan - This method is called immediately
/// before PrologEpilogInserter scans the physical registers used to determine
/// what callee-save registers should be spilled. This method is optional.
virtual void processFunctionBeforeCalleeSaveScan(MachineFunction &MF) const {
}
/// processFunctionBeforeFrameFinalized - This method is called immediately
/// before the specified functions frame layout (MF.getFrameInfo()) is
/// finalized. Once the frame is finalized, MO_FrameIndex operands are
/// replaced with direct constants. This method is optional. The return value
/// is the number of instructions added to (negative if removed from) the
/// basic block
/// replaced with direct constants. This method is optional.
///
virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
}