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Suppress a compiler warning generated by Clang.

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Clang doesn't like it if you bitshift negative numbers, as the behaviour
of it is undefined. Solve this by first shifting, followed by negating.
This was fixed similarly in FreeBSD.
This commit is contained in:
Ed Schouten 2016-02-27 17:27:55 +01:00
parent 78c0afb2a7
commit 62c7361aab
1 changed files with 2 additions and 2 deletions
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4
src/s_exp2.c
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@ -375,14 +375,14 @@ exp2(double x)
/* Compute r = exp2(y) = exp2t[i0] * p(z - eps[i]). */ /* Compute r = exp2(y) = exp2t[i0] * p(z - eps[i]). */
t = tbl[i0]; /* exp2t[i0] */ t = tbl[i0]; /* exp2t[i0] */
z -= tbl[i0 + 1]; /* eps[i0] */ z -= tbl[i0 + 1]; /* eps[i0] */
if (k >= -1021 << 20) if (k >= -(1021 << 20))
INSERT_WORDS(twopk, 0x3ff00000 + k, 0); INSERT_WORDS(twopk, 0x3ff00000 + k, 0);
else else
INSERT_WORDS(twopkp1000, 0x3ff00000 + k + (1000 << 20), 0); INSERT_WORDS(twopkp1000, 0x3ff00000 + k + (1000 << 20), 0);
r = t + t * z * (P1 + z * (P2 + z * (P3 + z * (P4 + z * P5)))); r = t + t * z * (P1 + z * (P2 + z * (P3 + z * (P4 + z * P5))));
/* Scale by 2**(k>>20). */ /* Scale by 2**(k>>20). */
if(k >= -1021 << 20) { if(k >= -(1021 << 20)) {
if (k == 1024 << 20) if (k == 1024 << 20)
return (r * 2.0 * 0x1p1023); return (r * 2.0 * 0x1p1023);
return (r * twopk); return (r * twopk);