Teach TableGen to pre-calculate register enum values when creating the
CodeGenRegister entries. Use this information to more intelligently build
the literal register entires in the DAGISel matcher table. Specifically,
use a single-byte OPC_EmitRegister entry for registers with a value of
less than 256 and OPC_EmitRegister2 entry for registers with a larger value.
rdar://9066491
llvm-svn: 127456
diff --git a/llvm/utils/TableGen/DAGISelEmitter.cpp b/llvm/utils/TableGen/DAGISelEmitter.cpp
index dee8f77..d66ae96 100644
--- a/llvm/utils/TableGen/DAGISelEmitter.cpp
+++ b/llvm/utils/TableGen/DAGISelEmitter.cpp
@@ -148,12 +148,8 @@
Matcher *TheMatcher = new ScopeMatcher(&PatternMatchers[0],
PatternMatchers.size());
- CodeGenTarget Target(Records);
- const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
- bool useEmitRegister2 = Registers.size() > 255;
-
TheMatcher = OptimizeMatcher(TheMatcher, CGP);
//Matcher->dump();
- EmitMatcherTable(TheMatcher, CGP, useEmitRegister2, OS);
+ EmitMatcherTable(TheMatcher, CGP, OS);
delete TheMatcher;
}