sincosf

sincosf is a single-precision trigonometric utility available in many C standard libraries. It computes both the sine and the cosine of a given angle, using a single call to reduce overhead and potential rounding differences compared with separate calls.

Signature and usage: void sincosf(float x, float* s, float* c); The function takes the input angle x in radians and writes sin(x) to the location pointed to by s and cos(x) to the location pointed to by c.

Example: float sv, cv; sincosf(angle, &sv, &cv);

Performance and accuracy: By computing both sine and cosine from the same input, sincosf can be faster than calling sinf and cosf separately. Implementations may optimize the shared evaluation to improve numerical consistency and accuracy.

Behavior and edge cases: For finite x, the outputs are sinf(x) and cosf(x). If x is NaN, both results are typically NaN. If either pointer argument is null, the behavior is undefined.

Availability and portability: sincosf is not part of the ISO C standard. It is provided as an extension by several libraries, including glibc, musl, BSD libc, and Apple's libc. The availability of sincosf may vary between environments, so developers should consult their toolchain documentation. A corresponding double-precision variant, sincos, exists in some libraries.