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fpu bug fix for fgetmant op

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- inserted missing break
- use temp variable instead of manipulating dest register

fgetexp changed to directly convert int to floatx80
This commit is contained in:
tevorbl 2020-05-30 13:37:04 +01:00
parent 799900f45a
commit e5da3227d9
1 changed files with 13 additions and 10 deletions
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23
plat/linux68k/emu/musashi/m68kfpu.c
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@ -1259,27 +1259,30 @@ static void fpgen_rm_reg(uint16 w2)
REG_FP[dst].high ^= 0x8000; REG_FP[dst].high ^= 0x8000;
SET_CONDITION_CODES(REG_FP[dst]); SET_CONDITION_CODES(REG_FP[dst]);
USE_CYCLES(3); USE_CYCLES(3);
break; break;
} }
case 0x1e: // FGETEXP case 0x1e: // FGETEXP
{ {
sint16 temp; sint16 temp;
temp = source.high; // get the exponent temp = source.high; // get the exponent
temp -= 0x3fff; // take off the bias temp -= 0x3fff; // take off the bias
REG_FP[dst] = double_to_fx80((double)temp); REG_FP[dst] = int32_to_floatx80((int32)temp);
SET_CONDITION_CODES(REG_FP[dst]); SET_CONDITION_CODES(REG_FP[dst]);
USE_CYCLES(6); USE_CYCLES(6);
} break;
}
case 0x1f: // FGETMANT (TBB) case 0x1f: // FGETMANT (TBB)
{ {
REG_FP[dst] = source; floatx80 temp = source;
REG_FP[dst].high &= ~0x7fff; // clear the bias, keep sign temp.high &= ~0x7fff; // clear the bias, keep sign
REG_FP[dst].high |= 0x3fff; // set new bias, 1.0 <= result < 2.0 temp.high |= 0x3fff; // set new bias, 1.0 <= result < 2.0
REG_FP[dst] = temp;
SET_CONDITION_CODES(REG_FP[dst]); SET_CONDITION_CODES(REG_FP[dst]);
//USE_CYCLES(6); USE_CYCLES(6);
break;
} }
@ -1611,8 +1614,8 @@ void m68040_fpu_op0()
{ {
case 0x0: // FPU ALU FP, FP case 0x0: // FPU ALU FP, FP
case 0x2: // FPU ALU ea, FP case 0x2: // FPU ALU ea, FP
{ {
fpgen_rm_reg(w2); fpgen_rm_reg(w2);
break; break;
} }