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[SystemZ] Tweak register array comment 

llvm-svn: 182007
This commit is contained in:
Richard Sandiford 2013-05-16 13:39:02 +00:00
parent 21cbaee6a9
commit 7fdd268b68
1 changed files with 5 additions and 2 deletions
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7
llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.h
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@ -36,8 +36,11 @@ namespace SystemZMC {
const int64_t CFAOffsetFromInitialSP = CallFrameSize;
// Maps of asm register numbers to LLVM register numbers, with 0 indicating
// an invalid register. We don't use the register classes directly because
// they specify the allocation order.
// an invalid register. In principle we could use 32-bit and 64-bit register
// classes directly, provided that we relegated the GPR allocation order
// in SystemZRegisterInfo.td to an AltOrder and left the default order
// as %r0-%r15. It seems better to provide the same interface for
// all classes though.
extern const unsigned GR32Regs[16];
extern const unsigned GR64Regs[16];
extern const unsigned GR128Regs[16];