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fixed FPATAN for case of |x|=|y|

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but i am pretty sure same problem might still exists for other arguments :(
need to resurrect FPU functions unit testing ...
This commit is contained in:
Stanislav Shwartsman 2023-11-19 22:00:46 +02:00
parent 0b2231b799
commit 36a1a3df86
1 changed files with 7 additions and 3 deletions
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8
bochs/cpu/fpu/fpatan.cc
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@ -90,7 +90,7 @@ static float128 poly_atan(float128 x1, float_status_t &status)
} }
// ================================================= // =================================================
// FPATAN Compute arctan(x/y) // FPATAN Compute arctan(y/x)
// ================================================= // =================================================
// //
@ -213,8 +213,12 @@ return_PI_or_ZERO:
float_raise(status, float_flag_inexact); float_raise(status, float_flag_inexact);
/* |a| = |b| ==> return PI/4 */ /* |a| = |b| ==> return PI/4 */
if (aSig == bSig && aExp == bExp) if (aSig == bSig && aExp == bExp) {
if (aSign)
return roundAndPackFloatx80(80, bSign, FLOATX80_3PI4_EXP, FLOAT_3PI4_HI, FLOAT_3PI4_LO, status);
else
return roundAndPackFloatx80(80, bSign, FLOATX80_PI4_EXP, FLOAT_PI_HI, FLOAT_PI_LO, status); return roundAndPackFloatx80(80, bSign, FLOATX80_PI4_EXP, FLOAT_PI_HI, FLOAT_PI_LO, status);
}
/* ******************************** */ /* ******************************** */
/* using float128 for approximation */ /* using float128 for approximation */