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[FAST486]

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Properly implement FRNDINT.


svn path=/trunk/; revision=67835
This commit is contained in:
Aleksandar Andrejevic 2015-05-20 17:23:55 +00:00
parent c3e0cd41ca
commit f0ffa72fc9
1 changed files with 5 additions and 13 deletions
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18
reactos/lib/fast486/fpu.c
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@ -2088,9 +2088,7 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
/* FRNDINT */ /* FRNDINT */
case 0x3C: case 0x3C:
{ {
INT Bits; LONGLONG Result = 0LL;
ULONGLONG Result = 0ULL;
ULONGLONG Remainder;
if (FPU_GET_TAG(0) == FPU_TAG_EMPTY) if (FPU_GET_TAG(0) == FPU_TAG_EMPTY)
{ {
@ -2111,18 +2109,12 @@ FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9)
} }
} }
Bits = min(max(0, (INT)FPU_ST(0).Exponent - FPU_REAL10_BIAS + 1), 64); /* Do nothing if it's too big to not be an integer */
if (Bits == 64) break; if (FPU_ST(0).Exponent >= FPU_REAL10_BIAS + 63) break;
if (Bits)
{
Result = FPU_ST(0).Mantissa >> (64 - Bits);
Remainder = FPU_ST(0).Mantissa & ((1 << (64 - Bits)) - 1);
}
else Remainder = FPU_ST(0).Mantissa;
/* Perform the rounding */ /* Perform the rounding */
Fast486FpuRound(State, &Result, FPU_ST(0).Sign, Remainder, 63 - Bits); Fast486FpuToInteger(State, &FPU_ST(0), &Result);
Fast486FpuFromInteger(State, Result, &FPU_ST(0));
State->FpuStatus.Pe = TRUE; State->FpuStatus.Pe = TRUE;
if (!State->FpuControl.Pm) Fast486FpuException(State); if (!State->FpuControl.Pm) Fast486FpuException(State);