in pcre/sljit/sljitNativeX86_common.c [722:864]
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op0(struct sljit_compiler *compiler, sljit_s32 op)
{
sljit_u8 *inst;
#if (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64)
sljit_s32 size;
#endif
CHECK_ERROR();
CHECK(check_sljit_emit_op0(compiler, op));
switch (GET_OPCODE(op)) {
case SLJIT_BREAKPOINT:
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1);
*inst = INT3;
break;
case SLJIT_NOP:
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1);
*inst = NOP;
break;
case SLJIT_LMUL_UW:
case SLJIT_LMUL_SW:
case SLJIT_DIVMOD_UW:
case SLJIT_DIVMOD_SW:
case SLJIT_DIV_UW:
case SLJIT_DIV_SW:
compiler->flags_saved = 0;
#if (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64)
#ifdef _WIN64
SLJIT_COMPILE_ASSERT(
reg_map[SLJIT_R0] == 0
&& reg_map[SLJIT_R1] == 2
&& reg_map[TMP_REG1] > 7,
invalid_register_assignment_for_div_mul);
#else
SLJIT_COMPILE_ASSERT(
reg_map[SLJIT_R0] == 0
&& reg_map[SLJIT_R1] < 7
&& reg_map[TMP_REG1] == 2,
invalid_register_assignment_for_div_mul);
#endif
compiler->mode32 = op & SLJIT_I32_OP;
#endif
SLJIT_COMPILE_ASSERT((SLJIT_DIVMOD_UW & 0x2) == 0 && SLJIT_DIV_UW - 0x2 == SLJIT_DIVMOD_UW, bad_div_opcode_assignments);
op = GET_OPCODE(op);
if ((op | 0x2) == SLJIT_DIV_UW) {
#if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32) || defined(_WIN64)
EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_R1, 0);
inst = emit_x86_instruction(compiler, 1, SLJIT_R1, 0, SLJIT_R1, 0);
#else
inst = emit_x86_instruction(compiler, 1, TMP_REG1, 0, TMP_REG1, 0);
#endif
FAIL_IF(!inst);
*inst = XOR_r_rm;
}
if ((op | 0x2) == SLJIT_DIV_SW) {
#if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32) || defined(_WIN64)
EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_R1, 0);
#endif
#if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32)
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1);
*inst = CDQ;
#else
if (compiler->mode32) {
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1);
*inst = CDQ;
} else {
inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
FAIL_IF(!inst);
INC_SIZE(2);
*inst++ = REX_W;
*inst = CDQ;
}
#endif
}
#if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32)
inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
FAIL_IF(!inst);
INC_SIZE(2);
*inst++ = GROUP_F7;
*inst = MOD_REG | ((op >= SLJIT_DIVMOD_UW) ? reg_map[TMP_REG1] : reg_map[SLJIT_R1]);
#else
#ifdef _WIN64
size = (!compiler->mode32 || op >= SLJIT_DIVMOD_UW) ? 3 : 2;
#else
size = (!compiler->mode32) ? 3 : 2;
#endif
inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
FAIL_IF(!inst);
INC_SIZE(size);
#ifdef _WIN64
if (!compiler->mode32)
*inst++ = REX_W | ((op >= SLJIT_DIVMOD_UW) ? REX_B : 0);
else if (op >= SLJIT_DIVMOD_UW)
*inst++ = REX_B;
*inst++ = GROUP_F7;
*inst = MOD_REG | ((op >= SLJIT_DIVMOD_UW) ? reg_lmap[TMP_REG1] : reg_lmap[SLJIT_R1]);
#else
if (!compiler->mode32)
*inst++ = REX_W;
*inst++ = GROUP_F7;
*inst = MOD_REG | reg_map[SLJIT_R1];
#endif
#endif
switch (op) {
case SLJIT_LMUL_UW:
*inst |= MUL;
break;
case SLJIT_LMUL_SW:
*inst |= IMUL;
break;
case SLJIT_DIVMOD_UW:
case SLJIT_DIV_UW:
*inst |= DIV;
break;
case SLJIT_DIVMOD_SW:
case SLJIT_DIV_SW:
*inst |= IDIV;
break;
}
#if (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64) && !defined(_WIN64)
if (op <= SLJIT_DIVMOD_SW)
EMIT_MOV(compiler, SLJIT_R1, 0, TMP_REG1, 0);
#else
if (op >= SLJIT_DIV_UW)
EMIT_MOV(compiler, SLJIT_R1, 0, TMP_REG1, 0);
#endif
break;
}
return SLJIT_SUCCESS;
}