From b51ecd4dd93b8eccf2cba3d541cff0f7cdbf7e1c Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 18 Jul 2006 17:38:46 +0000 Subject: [PATCH] Steal bits from the asm string index to use for operand information. On both x86 and ppc, this gets us 4 more bits to play with, since the string indices both only use 12 bits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29180 91177308-0d34-0410-b5e6-96231b3b80d8 --- utils/TableGen/AsmWriterEmitter.cpp | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/utils/TableGen/AsmWriterEmitter.cpp b/utils/TableGen/AsmWriterEmitter.cpp index ea4f159f9cd..f84ebbfad4e 100644 --- a/utils/TableGen/AsmWriterEmitter.cpp +++ b/utils/TableGen/AsmWriterEmitter.cpp @@ -457,8 +457,7 @@ void AsmWriterEmitter::run(std::ostream &O) { // To reduce code size, we compactify common instructions into a few bits // in the opcode-indexed table. - // 16 bits to play with. - unsigned BitsLeft = 16; + unsigned BitsLeft = 32-AsmStrBits; std::vector > TableDrivenOperandPrinters; @@ -501,7 +500,7 @@ void AsmWriterEmitter::run(std::ostream &O) { O<<" static const unsigned OpInfo[] = {\n"; for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) { - O << " " << OpcodeInfo[i] << ",\t// " + O << " " << OpcodeInfo[i] << "U,\t// " << NumberedInstructions[i]->TheDef->getName() << "\n"; } // Add a dummy entry so the array init doesn't end with a comma. @@ -548,7 +547,7 @@ void AsmWriterEmitter::run(std::ostream &O) { << " O << AsmStrs+(Bits & " << (1 << AsmStrBits)-1 << ");\n\n"; // Output the table driven operand information. - BitsLeft = 16; + BitsLeft = 32-AsmStrBits; for (unsigned i = 0, e = TableDrivenOperandPrinters.size(); i != e; ++i) { std::vector &Commands = TableDrivenOperandPrinters[i]; @@ -595,12 +594,15 @@ void AsmWriterEmitter::run(std::ostream &O) { // elements in the vector. std::reverse(Instructions.begin(), Instructions.end()); - // Find the opcode # of inline asm - O << " switch (MI->getOpcode()) {\n"; - while (!Instructions.empty()) - EmitInstructions(Instructions, O); + if (!Instructions.empty()) { + // Find the opcode # of inline asm. + O << " switch (MI->getOpcode()) {\n"; + while (!Instructions.empty()) + EmitInstructions(Instructions, O); - O << " }\n" - " return true;\n" + O << " }\n"; + } + + O << " return true;\n" "}\n"; }