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target/i386: Simplify POPF 

Compute the eflags write mask separately, leaving one call
to the helper.  Use tcg_constant_i32.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-02-25 13:24:35 -10:00
parent 3b10fd8f09
commit 3e7da311d7
1 changed files with 11 additions and 44 deletions
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55
target/i386/tcg/translate.c
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@ -5226,52 +5226,19 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
case 0x9d: /* popf */
gen_svm_check_intercept(s, SVM_EXIT_POPF);
if (check_vm86_iopl(s)) {
ot = gen_pop_T0(s);
int mask = TF_MASK | AC_MASK | ID_MASK | NT_MASK;
if (CPL(s) == 0) {
if (dflag != MO_16) {
gen_helper_write_eflags(cpu_env, s->T0,
tcg_const_i32((TF_MASK | AC_MASK |
ID_MASK | NT_MASK |
IF_MASK |
IOPL_MASK)));
} else {
gen_helper_write_eflags(cpu_env, s->T0,
tcg_const_i32((TF_MASK | AC_MASK |
ID_MASK | NT_MASK |
IF_MASK | IOPL_MASK)
& 0xffff));
}
} else {
if (CPL(s) <= IOPL(s)) {
if (dflag != MO_16) {
gen_helper_write_eflags(cpu_env, s->T0,
tcg_const_i32((TF_MASK |
AC_MASK |
ID_MASK |
NT_MASK |
IF_MASK)));
} else {
gen_helper_write_eflags(cpu_env, s->T0,
tcg_const_i32((TF_MASK |
AC_MASK |
ID_MASK |
NT_MASK |
IF_MASK)
& 0xffff));
}
} else {
if (dflag != MO_16) {
gen_helper_write_eflags(cpu_env, s->T0,
tcg_const_i32((TF_MASK | AC_MASK |
ID_MASK | NT_MASK)));
} else {
gen_helper_write_eflags(cpu_env, s->T0,
tcg_const_i32((TF_MASK | AC_MASK |
ID_MASK | NT_MASK)
& 0xffff));
}
}
mask |= IF_MASK | IOPL_MASK;
} else if (CPL(s) <= IOPL(s)) {
mask |= IF_MASK;
}
if (dflag == MO_16) {
mask &= 0xffff;
}
ot = gen_pop_T0(s);
gen_helper_write_eflags(cpu_env, s->T0, tcg_constant_i32(mask));
gen_pop_update(s, ot);
set_cc_op(s, CC_OP_EFLAGS);
/* abort translation because TF/AC flag may change */