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sharc.cpp: added fmul abs multi opcode (used by Gunblade NY) [Angelo Salese]

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This commit is contained in:
angelosa 2018-03-07 23:24:13 +01:00
parent 7d0cc6fcc9
commit f3af1ed20c
3 changed files with 49 additions and 2 deletions
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40
src/devices/cpu/sharc/compute.hxx
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@ -1272,7 +1272,45 @@ void adsp21062_device::compute_fmul_avg(int fm, int fxm, int fym, int fa, int fx
r_mul.f = FREG(fxm) * FREG(fym);
r_alu.f = (FREG(fxa) * FREG(fya))/((float) 2.0);
/* TODO: are flags right for this? */
// TODO: are flags right for this?
if (m_core->mode1 & MODE1_TRUNCATE)
{
alu_i = (int32_t)(r_alu.f);
}
else
{
alu_i = (int32_t)(r_alu.f < 0 ? (r_alu.f - 0.5f) : (r_alu.f + 0.5f));
}
CLEAR_MULTIPLIER_FLAGS();
SET_FLAG_MN(r_mul.r);
/* TODO: MV flag */
/* TODO: MU flag */
/* TODO: MI flag */
CLEAR_ALU_FLAGS();
SET_FLAG_AN(alu_i);
// AZ
SET_FLAG_AZ(alu_i);
// AU
m_core->stky |= (IS_FLOAT_DENORMAL(r_alu.r)) ? AUS : 0;
// AI
m_core->astat |= (IS_FLOAT_NAN(REG(fxa))) ? AI : 0;
/* TODO: AV flag */
FREG(fm) = r_mul.f;
REG(fa) = alu_i;
m_core->astat |= AF;
}
void adsp21062_device::compute_fmul_abs(int fm, int fxm, int fym, int fa, int fxa, int fya)
{
int32_t alu_i;
SHARC_REG r_mul, r_alu;
r_mul.f = FREG(fxm) * FREG(fym);
r_alu.f = (float) fabs(FREG(fxa));
// TODO: are flags right for this?
if (m_core->mode1 & MODE1_TRUNCATE)
{
alu_i = (int32_t)(r_alu.f);

1
src/devices/cpu/sharc/sharc.h
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@ -589,6 +589,7 @@ private:
inline void compute_fmul_float_scaled(int fm, int fxm, int fym, int fa, int fxa, int fya);
inline void compute_fmul_fix_scaled(int fm, int fxm, int fym, int fa, int fxa, int fya);
inline void compute_fmul_avg(int fm, int fxm, int fym, int fa, int fxa, int fya);
inline void compute_fmul_abs(int fm, int fxm, int fym, int fa, int fxa, int fya);
inline void compute_fmul_fmax(int fm, int fxm, int fym, int fa, int fxa, int fya);
inline void compute_fmul_fmin(int fm, int fxm, int fym, int fa, int fxa, int fya);
inline void compute_fmul_dual_fadd_fsub(int fm, int fxm, int fym, int fa, int fs, int fxa, int fya);

10
src/devices/cpu/sharc/sharcops.hxx
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@ -739,12 +739,20 @@ void adsp21062_device::COMPUTE(uint32_t opcode)
break;
}
case 0x1c: /* TODO! fmul_avg */
// TODO: verify this (last bronx)
case 0x1c:
{
compute_fmul_avg(fm, fxm, fym, fa, fxa, fya);
break;
}
// TODO: verify this (Gunblade NY Score Attack Remix mode)
case 0x1d:
{
compute_fmul_abs(fm, fxm, fym, fa, fxa, fya);
break;
}
case 0x1e: /* Fm = Fxm * Fym, Fa = MAX(Fxa, Fya) */
{
compute_fmul_fmax(fm, fxm, fym, fa, fxa, fya);