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math: fix fmaf not to depend on FE_TOWARDZERO

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Szabolcs Nagy 2021-07-05 22:37:22 +00:00 committed by Rich Felker
parent 937822abb6
commit 4f3d346bff
1 changed files with 10 additions and 11 deletions
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21
src/math/fmaf.c
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@ -77,17 +77,16 @@ float fmaf(float x, float y, float z)
* If result is inexact, and exactly halfway between two float values, * If result is inexact, and exactly halfway between two float values,
* we need to adjust the low-order bit in the direction of the error. * we need to adjust the low-order bit in the direction of the error.
*/ */
#ifdef FE_TOWARDZERO double err;
fesetround(FE_TOWARDZERO); int neg = u.i >> 63;
#endif if (neg == (z > xy))
volatile double vxy = xy; /* XXX work around gcc CSE bug */ err = xy - result + z;
double adjusted_result = vxy + z; else
fesetround(FE_TONEAREST); err = z - result + xy;
if (result == adjusted_result) { if (neg == (err < 0))
u.f = adjusted_result;
u.i++; u.i++;
adjusted_result = u.f; else
} u.i--;
z = adjusted_result; z = u.f;
return z; return z;
} }