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target-i386: Use MO_BE for movbe

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Fold the bswap into the memory operation.

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 09:22:04 -10:00
parent 4eeb3939b5
commit 3655a19fdd
1 changed files with 5 additions and 35 deletions
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40
target-i386/translate.c
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@ -3869,44 +3869,14 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
ot = MO_64;
}
/* Load the data incoming to the bswap. Note that the TCG
implementation of bswap requires the input be zero
extended. In the case of the loads, we simply know that
gen_op_ld_v via gen_ldst_modrm does that already. */
if ((b & 1) == 0) {
gen_ldst_modrm(env, s, modrm, ot, OR_TMP0, 0);
} else {
switch (ot) {
case MO_16:
tcg_gen_ext16u_tl(cpu_T[0], cpu_regs[reg]);
break;
default:
tcg_gen_ext32u_tl(cpu_T[0], cpu_regs[reg]);
break;
case MO_64:
tcg_gen_mov_tl(cpu_T[0], cpu_regs[reg]);
break;
}
}
switch (ot) {
case MO_16:
tcg_gen_bswap16_tl(cpu_T[0], cpu_T[0]);
break;
default:
tcg_gen_bswap32_tl(cpu_T[0], cpu_T[0]);
break;
#ifdef TARGET_X86_64
case MO_64:
tcg_gen_bswap64_tl(cpu_T[0], cpu_T[0]);
break;
#endif
}
gen_lea_modrm(env, s, modrm);
if ((b & 1) == 0) {
tcg_gen_qemu_ld_tl(cpu_T[0], cpu_A0,
s->mem_index, ot | MO_BE);
gen_op_mov_reg_T0(ot, reg);
} else {
gen_ldst_modrm(env, s, modrm, ot, OR_TMP0, 1);
tcg_gen_qemu_st_tl(cpu_regs[reg], cpu_A0,
s->mem_index, ot | MO_BE);
}
break;