diff options
| author | Alkis Evlogimenos <alkis@evlogimenos.com> | 2003-11-04 23:07:00 +0000 |
|---|---|---|
| committer | Alkis Evlogimenos <alkis@evlogimenos.com> | 2003-11-04 23:07:00 +0000 |
| commit | 4dad76cea0a85f62e016636b5b59d0bc4a7411dc (patch) | |
| tree | e64febad652f858e5a8fce70946ae49f7b17f7f4 /include/llvm | |
| parent | e668dab5b339df01920b8bff890a70455b7dd27a (diff) | |
| download | external_llvm-4dad76cea0a85f62e016636b5b59d0bc4a7411dc.zip external_llvm-4dad76cea0a85f62e016636b5b59d0bc4a7411dc.tar.gz external_llvm-4dad76cea0a85f62e016636b5b59d0bc4a7411dc.tar.bz2 | |
Update documentation since it was misleading: make it clear that a
negative instruction count is returned if instructions are removed
from a basic block.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9705 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm')
| -rw-r--r-- | include/llvm/Target/MRegisterInfo.h | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/include/llvm/Target/MRegisterInfo.h b/include/llvm/Target/MRegisterInfo.h index c4bccee..469242c 100644 --- a/include/llvm/Target/MRegisterInfo.h +++ b/include/llvm/Target/MRegisterInfo.h @@ -186,8 +186,8 @@ public: //===--------------------------------------------------------------------===// // All basic block modifier functions below return the number of - // instructions added to/removed from the basic block passed as their - // first argument. + // instructions added to (negative if removed from) the basic block + // passed as their first argument. // // FIXME: This is only needed because we use a std::vector instead // of an ilist to keep MachineBasicBlock instructions. Inserting an @@ -199,10 +199,10 @@ public: // //===--------------------------------------------------------------------===// - // Interfaces used by the register allocator and stack frame manipulation - // passes to move data around between registers, immediates and memory. - // The return value is the number of instructions added/deleted to/from the - // basic block. + // Interfaces used by the register allocator and stack frame + // manipulation passes to move data around between registers, + // immediates and memory. The return value is the number of + // instructions added to (negative if removed from) the basic block. // virtual int storeRegToStackSlot(MachineBasicBlock &MBB, @@ -237,7 +237,7 @@ public: /// for eliminating these instructions, replacing them with concrete /// instructions. This method need only be implemented if using call frame /// setup/destroy pseudo instructions. The return value is the number of - /// instructions added/deleted to/from the basic block. + /// instructions added to (negative if removed from) the basic block. /// virtual int eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, @@ -252,7 +252,8 @@ public: /// 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/deleted to/from the basic block + /// is the number of instructions added to (negative if removed from) the + /// basic block /// virtual int processFunctionBeforeFrameFinalized(MachineFunction &MF) const { return 0; @@ -264,14 +265,15 @@ public: /// eliminated by this method. This method may modify or replace the /// specified instruction, as long as it keeps the iterator pointing the the /// finished product. The return value is the number of instructions - /// added/deleted to/from the basic block + /// added to (negative if removed from) the basic block. /// virtual int eliminateFrameIndex(MachineFunction &MF, MachineBasicBlock::iterator &II) const = 0; /// emitProlog/emitEpilog - These methods insert prolog and epilog code into /// the function. The return value is the number of instructions - /// added/deleted to/from the basic block (entry for prologue, + /// added to (negative if removed from) the basic block (entry for prologue). + /// virtual int emitPrologue(MachineFunction &MF) const = 0; virtual int emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const = 0; |