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| author | Hal Finkel <hfinkel@anl.gov> | 2013-04-06 19:30:20 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-04-06 19:30:20 +0000 |
| commit | a36119beeceb125fe2097da2729dca886973b108 (patch) | |
| tree | 373b40f6d20540e54b3dae7e28b4457cb6e329d1 /include/llvm/Target | |
| parent | 1f25fe50236e5842b19198fbfe8a812be0b40cf5 (diff) | |
| download | llvm-a36119beeceb125fe2097da2729dca886973b108.tar.gz llvm-a36119beeceb125fe2097da2729dca886973b108.tar.bz2 llvm-a36119beeceb125fe2097da2729dca886973b108.tar.xz | |
Add a comment to TargetInstrInfo about FoldImmediate
This comment documents the current behavior of the ARM implementation of this
callback, and also the soon-to-be-committed PPC version.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178959 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/Target')
| -rw-r--r-- | include/llvm/Target/TargetInstrInfo.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h index 0ba75e5d7c..d49ce1ce7f 100644 --- a/include/llvm/Target/TargetInstrInfo.h +++ b/include/llvm/Target/TargetInstrInfo.h @@ -774,6 +774,10 @@ public: /// FoldImmediate - 'Reg' is known to be defined by a move immediate /// instruction, try to fold the immediate into the use instruction. + /// If MRI->hasOneNonDBGUse(Reg) is true, and this function returns true, + /// then the caller may assume that DefMI has been erased from its parent + /// block. The caller may assume that it will not be erased by this + /// function otherwise. virtual bool FoldImmediate(MachineInstr *UseMI, MachineInstr *DefMI, unsigned Reg, MachineRegisterInfo *MRI) const { return false; |