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FPU: Re-enabled SoftFloat on 808x and implement the missing FBLD instruction, closes #4300.

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This commit is contained in:
OBattler
2024-03-25 19:59:26 +01:00
parent 31dee950ab
commit 0b0cb84bf7
4 changed files with 278 additions and 67 deletions
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83
src/cpu/x87_ops_loadstore.h
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@@ -144,6 +144,89 @@ opFILDiq_a32(uint32_t fetchdat)
}
#endif
static int
FBLD_a16(uint32_t fetchdat)
{
uint16_t load_reg_hi = 0xffff;
uint64_t load_reg_lo = BX_CONST64(0xC000000000000000);
int64_t load_val = 0ULL;
uint64_t power;
int sign;
FP_ENTER();
fetch_ea_16(fetchdat);
SEG_CHECK_READ(cpu_state.ea_seg);
load_reg_lo = readmemq(easeg, cpu_state.eaaddr);
load_reg_hi = readmemw(easeg, cpu_state.eaaddr + 8);
if (cpu_state.abrt)
return 1;
clear_C1();
sign = (load_reg_hi & 0x8000) != 0;
load_val = 0ULL;
power = 1;
for (int i = 0; i < 16; i++) {
load_val += ((uint64_t) (load_reg_lo & 0xf)) * power;
load_reg_lo >>= 4;
power *= 10;
}
for (int i = 0; i < 2; i++) {
load_val += ((uint64_t) (load_reg_hi & 0xf)) * power;
load_reg_hi >>= 4;
power *= 10;
}
if (sign)
load_val = -load_val;
x87_push((double) load_val);
cpu_state.MM[cpu_state.TOP & 7].q = load_val;
FP_TAG_DEFAULT;
CLOCK_CYCLES_FPU((fpu_type >= FPU_487SX) ? (x87_timings.fild_64) : (x87_timings.fild_64 * cpu_multi));
CONCURRENCY_CYCLES((fpu_type >= FPU_487SX) ? (x87_concurrency.fild_64) : (x87_concurrency.fild_64 * cpu_multi));
return 0;
}
#ifndef FPU_8087
static int
FBLD_a32(uint32_t fetchdat)
{
uint16_t load_reg_hi = 0xffff;
uint64_t load_reg_lo = BX_CONST64(0xC000000000000000);
int64_t load_val = 0ULL;
uint64_t power;
int sign;
FP_ENTER();
fetch_ea_32(fetchdat);
SEG_CHECK_READ(cpu_state.ea_seg);
load_reg_lo = readmemq(easeg, cpu_state.eaaddr);
load_reg_hi = readmemw(easeg, cpu_state.eaaddr + 8);
if (cpu_state.abrt)
return 1;
clear_C1();
sign = (load_reg_hi & 0x8000) != 0;
load_val = 0ULL;
power = 1;
for (int i = 0; i < 16; i++) {
load_val += ((uint64_t) (load_reg_lo & 0xf)) * power;
load_reg_lo >>= 4;
power *= 10;
}
for (int i = 0; i < 2; i++) {
load_val += ((uint64_t) (load_reg_hi & 0xf)) * power;
load_reg_hi >>= 4;
power *= 10;
}
if (sign)
load_val = -load_val;
x87_push((double) load_val);
cpu_state.MM[cpu_state.TOP & 7].q = load_val;
FP_TAG_DEFAULT;
CLOCK_CYCLES_FPU((fpu_type >= FPU_487SX) ? (x87_timings.fild_64) : (x87_timings.fild_64 * cpu_multi));
CONCURRENCY_CYCLES((fpu_type >= FPU_487SX) ? (x87_concurrency.fild_64) : (x87_concurrency.fild_64 * cpu_multi));
return 0;
}
#endif
static int
FBSTP_a16(uint32_t fetchdat)
{