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| author | Jakob Kaivo <jkk@ung.org> | 2019-03-03 21:25:50 -0500 |
|---|---|---|
| committer | Jakob Kaivo <jkk@ung.org> | 2019-03-03 21:25:50 -0500 |
| commit | 06696f40afe58a231e2531c8bf6d9f0dadb92e51 (patch) | |
| tree | b146422c6326ffe3debf3163f0941d8dda0be105 /src/math/fabs.c | |
| parent | f20eeea657d62f2ef905627ca3a9094d33af7d40 (diff) | |
outline details from C18 annex F
Diffstat (limited to 'src/math/fabs.c')
| -rw-r--r-- | src/math/fabs.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/math/fabs.c b/src/math/fabs.c index 9664b702..5fc42750 100644 --- a/src/math/fabs.c +++ b/src/math/fabs.c @@ -6,6 +6,12 @@ /** absolute value **/ TYPE TGFN(fabs)(TYPE x) { + switch (fpclassify(x)) { + case FP_ZERO: return 0.0; + case FP_INFINITE: return INFINITY; + default: break; + } + if (0) { errno = ERANGE; /* The result cannot be represented */ /* RETURN_FAILURE(CONSTANT(HUGE_VAL), A range error occurred); */ @@ -13,7 +19,7 @@ TYPE TGFN(fabs)(TYPE x) } /* RETURN_SUCCESS(ABS(ARGUMENT(x))); */ - return x < 0.0 ? -x : x; + return signbit(x) ? -x : x; } /*** |