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Fixed x87 rounding up bit (C1) for float32 and float64 data types

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Stanislav Shwartsman 2009-04-11 18:56:23 +00:00
parent 024d36fa12
commit 09a2973262
1 changed files with 10 additions and 8 deletions
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18
bochs/fpu/softfloat-round-pack.cc
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@ -221,10 +221,11 @@ float32 roundAndPackFloat32(int zSign, Bit16s zExp, Bit32u zSig, float_status_t
}
}
if (roundBits) float_raise(status, float_flag_inexact);
zSig = ((zSig + roundIncrement) & ~roundMask) >> 7;
zSig &= ~(((roundBits ^ 0x40) == 0) & roundNearestEven);
if (zSig == 0) zExp = 0;
return packFloat32(zSign, zExp, zSig);
Bit32u zSigRound = ((zSig + roundIncrement) & ~roundMask) >> 7;
zSigRound &= ~(((roundBits ^ 0x40) == 0) & roundNearestEven);
if ((zSigRound << 7) > zSig) set_float_rounding_up(status);
if (zSigRound == 0) zExp = 0;
return packFloat32(zSign, zExp, zSigRound);
}
/*----------------------------------------------------------------------------
@ -321,10 +322,11 @@ float64 roundAndPackFloat64(int zSign, Bit16s zExp, Bit64u zSig, float_status_t
}
}
if (roundBits) float_raise(status, float_flag_inexact);
zSig = (zSig + roundIncrement)>>10;
zSig &= ~(((roundBits ^ 0x200) == 0) & roundNearestEven);
if (zSig == 0) zExp = 0;
return packFloat64(zSign, zExp, zSig);
Bit64u zSigRound = (zSig + roundIncrement)>>10;
zSigRound &= ~(((roundBits ^ 0x200) == 0) & roundNearestEven);
if ((zSigRound << 10) > zSig) set_float_rounding_up(status);
if (zSigRound == 0) zExp = 0;
return packFloat64(zSign, zExp, zSigRound);
}
/*----------------------------------------------------------------------------