From 81b2fd5819af2d06011d5a2b031e41527d478ba4 Mon Sep 17 00:00:00 2001 From: Hal Finkel Date: Fri, 12 Apr 2013 18:17:38 +0000 Subject: [PATCH] Add a comment about the PPC Interpretation64Bit bit git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179391 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/PowerPC/PPCInstrFormats.td | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/Target/PowerPC/PPCInstrFormats.td b/lib/Target/PowerPC/PPCInstrFormats.td index 37e26726f76..36f193be993 100644 --- a/lib/Target/PowerPC/PPCInstrFormats.td +++ b/lib/Target/PowerPC/PPCInstrFormats.td @@ -38,6 +38,11 @@ class I 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; }