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Add a comment about the PPC Interpretation64Bit bit

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179391 91177308-0d34-0410-b5e6-96231b3b80d8
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Hal Finkel 2013-04-12 18:17:38 +00:00
parent 1877dc00e7
commit 81b2fd5819
1 changed files with 5 additions and 0 deletions
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lib/Target/PowerPC/PPCInstrFormats.td
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@ -38,6 +38,11 @@ class I<bits<6> opcode, dag OOL, dag IOL, string asmstr, InstrItinClass itin>
// Fields used for relation models.
string BaseName = "";
// For cases where multiple instruction definitions really represent the
// same underlying instruction but with one definition for 64-bit arguments
// and one for 32-bit arguments, this bit breaks the degeneracy between
// the two forms and allows TableGen to generate mapping tables.
bit Interpretation64Bit = 0;
}