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Correct comment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49913 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-04-18 19:25:26 +00:00
parent 883d260045
commit a8f720d695
1 changed files with 2 additions and 2 deletions
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4
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -466,8 +466,8 @@ SimpleRegisterCoalescing::UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg,
O.setSubReg(0);
} else {
// Sub-register indexes goes from small to large. e.g.
// RAX: 0 -> AL, 1 -> AH, 2 -> AX, 3 -> EAX
// EAX: 0 -> AL, 1 -> AH, 2 -> AX
// RAX: 1 -> AL, 2 -> AX, 3 -> EAX
// EAX: 1 -> AL, 2 -> AX
// So RAX's sub-register 2 is AX, RAX's sub-regsiter 3 is EAX, whose
// sub-register 2 is also AX.
if (SubIdx && OldSubIdx && SubIdx != OldSubIdx)