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fixed fuz handling in floating point add/sub

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This commit is contained in:
Stanislav Shwartsman 2011-05-04 05:52:40 +00:00
parent 7d9704e080
commit d18553cfa4
1 changed files with 14 additions and 2 deletions
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16
bochs/fpu/softfloat.cc
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@ -410,7 +410,13 @@ static float32 addFloat32Sigs(float32 a, float32 b, int zSign, float_status_t &s
return a;
}
if (aExp == 0) {
if (aSig | bSig) float_raise(status, float_flag_denormal);
if (aSig | bSig) {
float_raise(status, float_flag_denormal);
if (get_flush_underflow_to_zero(status)) {
float_raise(status, float_flag_inexact);
return packFloat32(zSign, 0, 0);
}
}
return packFloat32(zSign, 0, (aSig + bSig)>>6);
}
zSig = 0x40000000 + aSig + bSig;
@ -1135,7 +1141,13 @@ static float64 addFloat64Sigs(float64 a, float64 b, int zSign, float_status_t &s
return a;
}
if (aExp == 0) {
if (aSig | bSig) float_raise(status, float_flag_denormal);
if (aSig | bSig) {
float_raise(status, float_flag_denormal);
if (get_flush_underflow_to_zero(status)) {
float_raise(status, float_flag_inexact);
return packFloat64(zSign, 0, 0);
}
}
return packFloat64(zSign, 0, (aSig + bSig)>>9);
}
zSig = BX_CONST64(0x4000000000000000) + aSig + bSig;