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x86-asm: Get rid of OPC_JMP and OPC_SHORTJMP

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Those two insn types are nicer to handle as operand types, because
the pressure for bits on instr_type is higher than for operands.
This commit is contained in:
Michael Matz
2016-05-16 05:58:30 +02:00
parent 4094f7c5fc
commit e2f489aaff
3 changed files with 28 additions and 28 deletions
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20
i386-asm.c
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@ -41,12 +41,8 @@
#define OPC_ARITH 0x30 /* arithmetic opcodes */
#define OPC_FARITH 0x40 /* FPU arithmetic opcodes */
#define OPC_TEST 0x50 /* test opcodes */
#define OPC_JMP_TEST 0x60 /* A test and jmp opcode */
#define OPC_JMP 0x70 /* A non-testing jmp opcode */
#define OPCT_IS(v,i) (((v) & OPCT_MASK) == (i))
#define OPC_SHORTJMP 0x80 /* short jmp operand */
#define OPC_0F 0x100 /* Is secondary map (0x0f prefix) */
#ifdef TCC_TARGET_X86_64
# define OPC_WLQ 0x1000 /* accepts w, l, q or no suffix */
@ -96,6 +92,8 @@ enum {
OPT_REGW, /* REG16 | REG32 | REG64 */
OPT_IMW, /* IM16 | IM32 */
OPT_MMXSSE, /* MMX | SSE */
OPT_DISP, /* Like OPT_ADDR, but emitted as displacement (for jumps) */
OPT_DISP8, /* Like OPT_ADDR, but only 8bit (short jumps) */
/* can be ored with any OPT_xxx */
OPT_EA = 0x80
};
@ -627,7 +625,7 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
if (!(opcode >= pa->sym && opcode < pa->sym + 7*NBWLX))
continue;
s = (opcode - pa->sym) % NBWLX;
} else if (it == OPC_TEST || it == OPC_JMP_TEST) {
} else if (it == OPC_TEST) {
if (!(opcode >= pa->sym && opcode < pa->sym + NB_TEST_OPCODES))
continue;
/* cmovxx is a test opcode but accepts multiple sizes.
@ -687,6 +685,10 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
case OPT_MMXSSE:
v = OP_MMX | OP_SSE;
break;
case OPT_DISP:
case OPT_DISP8:
v = OP_ADDR;
break;
default:
v = 1 << op2;
break;
@ -833,7 +835,7 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
}
if (pa->instr_type & OPC_B)
v += s >= 1;
if (pa->instr_type & OPC_SHORTJMP) {
if (nb_ops == 1 && pa->op_type[0] == OPT_DISP8) {
Sym *sym;
int jmp_disp;
@ -861,8 +863,7 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
tcc_error("invalid displacement");
}
}
if (OPCT_IS(pa->instr_type, OPC_TEST)
|| OPCT_IS(pa->instr_type, OPC_JMP_TEST))
if (OPCT_IS(pa->instr_type, OPC_TEST))
v += test_bits[opcode - pa->sym];
op1 = v >> 16;
if (op1)
@ -955,8 +956,7 @@ ST_FUNC void asm_opcode(TCCState *s1, int opcode)
} else if (v & OP_IM64) {
gen_expr64(&ops[i].e);
#endif
} else if (OPCT_IS (pa->instr_type, OPC_JMP)
|| OPCT_IS (pa->instr_type, OPC_JMP_TEST)) {
} else if (pa->op_type[i] == OPT_DISP || pa->op_type[i] == OPT_DISP8) {
gen_disp32(&ops[i].e);
} else {
gen_expr32(&ops[i].e);