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target-i386: Tidy mov[sz][bw]

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We can use the MO_SIGN bit to tidy the reg-reg switch statement
as well as pass it on to gen_op_ld_v, eliminating one call.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-11-02 08:28:40 -10:00
parent ee3138da2f
commit c8fbc47967
1 changed files with 12 additions and 11 deletions
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23
target-i386/translate.c
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@ -5618,11 +5618,16 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
case 0x1be: /* movsbS Gv, Eb */
case 0x1bf: /* movswS Gv, Eb */
{
int d_ot;
TCGMemOp d_ot;
TCGMemOp s_ot;
/* d_ot is the size of destination */
d_ot = dflag + MO_16;
/* ot is the size of source */
ot = (b & 1) + MO_8;
/* s_ot is the sign+size of source */
s_ot = b & 8 ? MO_SIGN | ot : ot;
modrm = cpu_ldub_code(env, s->pc++);
reg = ((modrm >> 3) & 7) | rex_r;
mod = (modrm >> 6) & 3;
@ -5630,29 +5635,25 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
if (mod == 3) {
gen_op_mov_TN_reg(ot, 0, rm);
switch(ot | (b & 8)) {
case MO_8:
switch (s_ot) {
case MO_UB:
tcg_gen_ext8u_tl(cpu_T[0], cpu_T[0]);
break;
case MO_8 | 8:
case MO_SB:
tcg_gen_ext8s_tl(cpu_T[0], cpu_T[0]);
break;
case MO_16:
case MO_UW:
tcg_gen_ext16u_tl(cpu_T[0], cpu_T[0]);
break;
default:
case MO_16 | 8:
case MO_SW:
tcg_gen_ext16s_tl(cpu_T[0], cpu_T[0]);
break;
}
gen_op_mov_reg_T0(d_ot, reg);
} else {
gen_lea_modrm(env, s, modrm, &reg_addr, &offset_addr);
if (b & 8) {
gen_op_ld_v(s, ot | MO_SIGN, cpu_T[0], cpu_A0);
} else {
gen_op_ld_v(s, ot, cpu_T[0], cpu_A0);
}
gen_op_ld_v(s, s_ot, cpu_T[0], cpu_A0);
gen_op_mov_reg_T0(d_ot, reg);
}
}