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authorAlex Bradbury <asb@lowrisc.org>2017-12-07 09:51:55 +0000
committerAlex Bradbury <asb@lowrisc.org>2017-12-07 09:51:55 +0000
commit2bd791038b53582293a9a6e9704af1c790f2f0b7 (patch)
treed737d97cc50b4069d5d4fff00abcc59806fa688e /utils
parent1d4832bccf885b1a592834018545343a56efec4a (diff)
[TableGen] Give the option of tolerating duplicate register names
A number of architectures re-use the same register names (e.g. for both 32-bit FPRs and 64-bit FPRs). They are currently unable to use the tablegen'erated MatchRegisterName and MatchRegisterAltName, as tablegen (when built with asserts enabled) will fail. When the AllowDuplicateRegisterNames in AsmParser is set, duplicated register names will be tolerated. A backend can then coerce registers to the desired register class by (for instance) implementing validateTargetOperandClass. At least the in-tree Sparc backend could benefit from this, as does RISC-V (single and double precision floating point registers). Differential Revision: https://reviews.llvm.org/D39845 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320018 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'utils')
-rw-r--r--utils/TableGen/AsmMatcherEmitter.cpp8
1 files changed, 6 insertions, 2 deletions
diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp
index 72fb53053fd..ee322ad9f33 100644
--- a/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/utils/TableGen/AsmMatcherEmitter.cpp
@@ -2438,7 +2438,9 @@ static void emitMatchRegisterName(CodeGenTarget &Target, Record *AsmParser,
OS << "static unsigned MatchRegisterName(StringRef Name) {\n";
- StringMatcher("Name", Matches, OS).Emit();
+ bool IgnoreDuplicates =
+ AsmParser->getValueAsBit("AllowDuplicateRegisterNames");
+ StringMatcher("Name", Matches, OS).Emit(0, IgnoreDuplicates);
OS << " return 0;\n";
OS << "}\n\n";
@@ -2469,7 +2471,9 @@ static void emitMatchRegisterAltName(CodeGenTarget &Target, Record *AsmParser,
OS << "static unsigned MatchRegisterAltName(StringRef Name) {\n";
- StringMatcher("Name", Matches, OS).Emit();
+ bool IgnoreDuplicates =
+ AsmParser->getValueAsBit("AllowDuplicateRegisterNames");
+ StringMatcher("Name", Matches, OS).Emit(0, IgnoreDuplicates);
OS << " return 0;\n";
OS << "}\n\n";