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Add sub-register sets.

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llvm-svn: 36277
This commit is contained in:
Evan Cheng 2007-04-20 21:11:22 +00:00
parent 8ab8d0784e
commit 9ade37c2f1
1 changed files with 3 additions and 0 deletions
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3
include/llvm/Target/MRegisterInfo.h
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@ -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 {