Changes in directory llvm/utils/TableGen:
AsmWriterEmitter.cpp updated: 1.33 -> 1.34
---
Log message:
Emit switches with 1/2 cases as unconditional code or an if/then/else for
tidyness.
---
Diffs of the changes: (+24 -10)
AsmWriterEmitter.cpp | 34 ++++++++++++++++++++++++----------
1 files changed, 24 insertions(+), 10 deletions(-)
Index: llvm/utils/TableGen/AsmWriterEmitter.cpp
diff -u llvm/utils/TableGen/AsmWriterEmitter.cpp:1.33
llvm/utils/TableGen/AsmWriterEmitter.cpp:1.34
--- llvm/utils/TableGen/AsmWriterEmitter.cpp:1.33 Tue Jul 18 12:38:46 2006
+++ llvm/utils/TableGen/AsmWriterEmitter.cpp Tue Jul 18 12:43:54 2006
@@ -560,18 +560,32 @@
BitsLeft -= NumBits;
O << "\n // Fragment " << i << " encoded into " << NumBits
- << " bits for " << Commands.size() << " unique commands.\n"
- << " switch ((Bits >> " << (BitsLeft+AsmStrBits) << ") & "
- << ((1 << NumBits)-1) << ") {\n"
- << " default: // unreachable.\n";
+ << " bits for " << Commands.size() << " unique commands.\n";
- // Print out all the cases.
- for (unsigned i = 0, e = Commands.size(); i != e; ++i) {
- O << " case " << i << ":\n";
- O << Commands[i];
- O << " break;\n";
+ if (Commands.size() == 1) {
+ // Only one possibility, just emit it.
+ O << Commands[0];
+ } else if (Commands.size() == 2) {
+ // Emit two possibilitys with if/else.
+ O << " if ((Bits >> " << (BitsLeft+AsmStrBits) << ") & "
+ << ((1 << NumBits)-1) << ") {\n"
+ << Commands[1]
+ << " } else {\n"
+ << Commands[0]
+ << " }\n\n";
+ } else {
+ O << " switch ((Bits >> " << (BitsLeft+AsmStrBits) << ") & "
+ << ((1 << NumBits)-1) << ") {\n"
+ << " default: // unreachable.\n";
+
+ // Print out all the cases.
+ for (unsigned i = 0, e = Commands.size(); i != e; ++i) {
+ O << " case " << i << ":\n";
+ O << Commands[i];
+ O << " break;\n";
+ }
+ O << " }\n\n";
}
- O << " }\n\n";
}
// Okay, go through and strip out the operand information that we just
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