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math: fix expf(-NAN) and exp2f(-NAN) to return -NAN instead of 0

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expf(-NAN) was treated as expf(-large) which unconditionally
returns +0, so special case +-NAN.
reported by Petr Hosek.
This commit is contained in:
Szabolcs Nagy 2016-03-04 21:23:33 +00:00 committed by Rich Felker
parent db66ef1f7d
commit b023c03b57
2 changed files with 4 additions and 0 deletions
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2
src/math/exp2f.c
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@ -91,6 +91,8 @@ float exp2f(float x)
/* Filter out exceptional cases. */
ix = u.i & 0x7fffffff;
if (ix > 0x42fc0000) { /* |x| > 126 */
if (ix > 0x7f800000) /* NaN */
return x;
if (u.i >= 0x43000000 && u.i < 0x80000000) { /* x >= 128 */
x *= 0x1p127f;
return x;

2
src/math/expf.c
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@ -39,6 +39,8 @@ float expf(float x)
/* special cases */
if (hx >= 0x42aeac50) { /* if |x| >= -87.33655f or NaN */
if (hx > 0x7f800000) /* NaN */
return x;
if (hx >= 0x42b17218 && !sign) { /* x >= 88.722839f */
/* overflow */
x *= 0x1p127f;