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x86-asm: Reorganize instr_type

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Disjoint instruction types don't need to be a bit field, so
introduce an enumeration (3 bits).  Also the 0x0f prefix can
be expressed by a bit, doesn't need a byte in the opcode field.
That enables to encode further prefixes still in 16 bit.
To not have to touch all insns do some macro fiddling filtering
out a 0x0f byte in the second position.
This commit is contained in:
Michael Matz
2016-05-15 18:46:05 +02:00
parent 4af6e087dd
commit bde802df29
3 changed files with 65 additions and 46 deletions
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i386-asm.h
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@ -221,7 +221,7 @@ ALT(DEF_ASM_OP1(ret, 0xc2, 0, 0, OPT_IM16))
DEF_ASM_OP0(lret, 0xcb)
ALT(DEF_ASM_OP1(lret, 0xca, 0, 0, OPT_IM16))
ALT(DEF_ASM_OP1(jo, 0x70, 0, OPC_SHORTJMP | OPC_JMP | OPC_TEST, OPT_ADDR))
ALT(DEF_ASM_OP1(jo, 0x70, 0, OPC_SHORTJMP | OPC_JMP_TEST, OPT_ADDR))
DEF_ASM_OP1(loopne, 0xe0, 0, OPC_SHORTJMP, OPT_ADDR)
DEF_ASM_OP1(loopnz, 0xe0, 0, OPC_SHORTJMP, OPT_ADDR)
DEF_ASM_OP1(loope, 0xe1, 0, OPC_SHORTJMP, OPT_ADDR)