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Implement new floating-point instructions (fre, frin, friz, frip, frim)

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as defined in the PowerPC 2.04 specification.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3281 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
j_mayer 2007-09-30 01:11:48 +00:00
parent 477023a603
commit d7e4b87e53
4 changed files with 106 additions and 0 deletions
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56
target-ppc/op_helper.c
View file

@ -700,6 +700,36 @@ void do_fctidz (void)
#endif
static inline void do_fri (int rounding_mode)
{
int curmode;
curmode = env->fp_status.float_rounding_mode;
set_float_rounding_mode(rounding_mode, &env->fp_status);
FT0 = float64_round_to_int(FT0, &env->fp_status);
set_float_rounding_mode(curmode, &env->fp_status);
}
void do_frin (void)
{
do_fri(float_round_nearest_even);
}
void do_friz (void)
{
do_fri(float_round_to_zero);
}
void do_frip (void)
{
do_fri(float_round_up);
}
void do_frim (void)
{
do_fri(float_round_down);
}
#if USE_PRECISE_EMULATION
void do_fmadd (void)
{
@ -789,6 +819,32 @@ void do_fsqrt (void)
FT0 = float64_sqrt(FT0, &env->fp_status);
}
void do_fre (void)
{
union {
double d;
uint64_t i;
} p;
if (likely(isnormal(FT0))) {
FT0 = float64_div(1.0, FT0, &env->fp_status);
} else {
p.d = FT0;
if (p.i == 0x8000000000000000ULL) {
p.i = 0xFFF0000000000000ULL;
} else if (p.i == 0x0000000000000000ULL) {
p.i = 0x7FF0000000000000ULL;
} else if (isnan(FT0)) {
p.i = 0x7FF8000000000000ULL;
} else if (FT0 < 0.0) {
p.i = 0x8000000000000000ULL;
} else {
p.i = 0x0000000000000000ULL;
}
FT0 = p.d;
}
}
void do_fres (void)
{
union {