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parseinstrs: Simplify encode opsize derivation

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This commit is contained in:
Alexis Engelke
2022-11-29 15:14:34 +01:00
parent 4abad24610
commit c54a749713
1 changed files with 23 additions and 32 deletions
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41
parseinstrs.py
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@@ -599,41 +599,32 @@ def encode_mnems(entries):
if "I64" in desc.flags or desc.mnemonic[:9] == "RESERVED_": if "I64" in desc.flags or desc.mnemonic[:9] == "RESERVED_":
continue continue
opsizes = {8} if "SZ8" in desc.flags else {16, 32, 64} opsizes, vecsizes = {0}, {0}
hasvex, vecsizes = False, {128} prepend_opsize, prepend_vecsize = False, False
# Where to put the operand size in the mnemonic
separate_opsize = "ENC_SEPSZ" in desc.flags
if opcode.vex: if "ENC_NOSZ" in desc.flags or not desc.dynsizes():
hasvex, vecsizes = True, {128, 256} pass
elif OpKind.SZ_OP in desc.dynsizes():
if opcode.rexw:
raise Exception(f"unexpected REXW specifier {desc}")
opsizes = {8} if "SZ8" in desc.flags else {16, 32, 64}
if opcode.prefix in ("66", "F2", "F3") and "U66" not in desc.flags: if opcode.prefix in ("66", "F2", "F3") and "U66" not in desc.flags:
opsizes -= {16} opsizes -= {16}
if opcode.vexl == "IG":
vecsizes = {0}
elif opcode.vexl:
vecsizes -= {128 if opcode.vexl == "1" else 256}
if opcode.rexw == "IG":
opsizes = {0}
elif opcode.rexw:
opsizes -= {32 if opcode.rexw == "1" else 64}
if "I66" in desc.flags: if "I66" in desc.flags:
opsizes -= {16} opsizes -= {16}
if "D64" in desc.flags: if "D64" in desc.flags:
opsizes -= {32} opsizes -= {32}
if "SZ8" not in desc.flags and "INSTR_WIDTH" not in desc.flags and all(op.size != OpKind.SZ_OP for op in desc.operands): prepend_opsize = not separate_opsize
opsizes = {0}
if "VSIB" not in desc.flags and all(op.size != OpKind.SZ_VEC for op in desc.operands):
vecsizes = {0} # for VEX-encoded general-purpose instructions.
if "ENC_NOSZ" in desc.flags:
opsizes, vecsizes = {0}, {0}
# Where to put the operand size in the mnemonic
separate_opsize = "ENC_SEPSZ" in desc.flags
prepend_opsize = max(opsizes) > 0 and not separate_opsize
prepend_vecsize = hasvex and max(vecsizes) > 0 and not separate_opsize
if "F64" in desc.flags: if "F64" in desc.flags:
opsizes = {64} opsizes = {64}
prepend_opsize = False prepend_opsize = False
elif opcode.vex and opcode.vexl != "IG": # vectors; don't care for SSE
vecsizes = {128, 256}
if opcode.vexl:
vecsizes -= {128 if opcode.vexl == "1" else 256}
prepend_vecsize = not separate_opsize
modrm_type = opcode.modreg[1] if opcode.modreg else "rm" modrm_type = opcode.modreg[1] if opcode.modreg else "rm"
optypes_base = desc.optype_str() optypes_base = desc.optype_str()