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Bug 997459 - Part 2: Coefficients for polevl_cos with fewer terms; potentially less precise, but more performant. r=sunfish

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Emanuel Hoogeveen 2014-04-21 10:44:11 -04:00
parent 30aefbde41
commit 490c7c43ff
1 changed files with 9 additions and 9 deletions
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18
js/src/jsmath.cpp
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@ -384,20 +384,20 @@ static double polevl_sin(double z, double zz)
static double polevl_cos(double zz)
{
// Constants taken from fdlibm k_cos.c
double ans = -1.13596475577881948265e-11;
// Constants generated using Mathematica's GeneralMiniMaxApproximation.
// This set uses one less coefficient than usual implementations to
// increase performance, raising the maximum approximation error to 2 bits.
double ans = 2.06467337476762997948e-9;
ans *= zz;
ans += 2.08757232129817482790e-09;
ans += -2.75555495413759160741e-7;
ans *= zz;
ans += -2.75573143513906633035e-07;
ans += 2.48015808595638122085e-5;
ans *= zz;
ans += 2.48015872894767294178e-05;
ans += -1.38888888779622760722e-3;
ans *= zz;
ans += -1.38888888888741095749e-03;
ans += 4.16666666665987187046e-2;
ans *= zz;
ans += 4.16666666666666019037e-02;
ans *= zz;
ans += -0.5;
ans += -4.99999999999999888978e-1;
ans *= zz;
ans += 1.0;
return ans;