diff options
| -rw-r--r-- | include/llvm/Target/MRegisterInfo.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/llvm/Target/MRegisterInfo.h b/include/llvm/Target/MRegisterInfo.h index 509485ab97..585f4bc37b 100644 --- a/include/llvm/Target/MRegisterInfo.h +++ b/include/llvm/Target/MRegisterInfo.h @@ -38,10 +38,13 @@ class Type; /// to a Zero terminated array of registers that this register aliases. This is /// needed for architectures like X86 which have AL alias AX alias EAX. /// Registers that this does not apply to simply should set this to null. +/// The SubRegs field is a zero terminated array of registers that are +/// sub-registers of the specific register, e.g. AL, AH are sub-registers of AX. /// struct TargetRegisterDesc { const char *Name; // Assembly language name for the register const unsigned *AliasSet; // Register Alias Set, described above + const unsigned *SubRegs; // Sub-register set, described above }; class TargetRegisterClass { |