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Add more indirection to the disassembler tables to reduce amount of space used to store the operand types and encodings. Store only the unique combinations in a separate table and store indices in the instruction table. Saves about 32K of static data.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161101 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper
2012-08-01 07:39:18 +00:00
parent adfe2637b8
commit 5a2c607153
7 changed files with 71 additions and 42 deletions
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16
lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
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@@ -1495,14 +1495,14 @@ static int readOperands(struct InternalInstruction* insn) {
needVVVV = hasVVVV && (insn->vvvv != 0);
for (index = 0; index < X86_MAX_OPERANDS; ++index) {
switch (insn->spec->operands[index].encoding) {
switch (x86OperandSets[insn->spec->operands][index].encoding) {
case ENCODING_NONE:
break;
case ENCODING_REG:
case ENCODING_RM:
if (readModRM(insn))
return -1;
if (fixupReg(insn, &insn->spec->operands[index]))
if (fixupReg(insn, &x86OperandSets[insn->spec->operands][index]))
return -1;
break;
case ENCODING_CB:
@@ -1524,14 +1524,14 @@ static int readOperands(struct InternalInstruction* insn) {
}
if (readImmediate(insn, 1))
return -1;
if (insn->spec->operands[index].type == TYPE_IMM3 &&
if (x86OperandSets[insn->spec->operands][index].type == TYPE_IMM3 &&
insn->immediates[insn->numImmediatesConsumed - 1] > 7)
return -1;
if (insn->spec->operands[index].type == TYPE_IMM5 &&
if (x86OperandSets[insn->spec->operands][index].type == TYPE_IMM5 &&
insn->immediates[insn->numImmediatesConsumed - 1] > 31)
return -1;
if (insn->spec->operands[index].type == TYPE_XMM128 ||
insn->spec->operands[index].type == TYPE_XMM256)
if (x86OperandSets[insn->spec->operands][index].type == TYPE_XMM128 ||
x86OperandSets[insn->spec->operands][index].type == TYPE_XMM256)
sawRegImm = 1;
break;
case ENCODING_IW:
@@ -1582,7 +1582,7 @@ static int readOperands(struct InternalInstruction* insn) {
needVVVV = 0; /* Mark that we have found a VVVV operand. */
if (!hasVVVV)
return -1;
if (fixupReg(insn, &insn->spec->operands[index]))
if (fixupReg(insn, &x86OperandSets[insn->spec->operands][index]))
return -1;
break;
case ENCODING_DUP:
@@ -1644,6 +1644,8 @@ int decodeInstruction(struct InternalInstruction* insn,
insn->instructionID == 0 ||
readOperands(insn))
return -1;
insn->operands = &x86OperandSets[insn->spec->operands][0];
insn->length = insn->readerCursor - insn->startLocation;