lntue da28593d71 [libc][math] Implement double precision expm1 function correctly rounded for all rounding modes. (#67048) ... Implementing expm1 function for double precision based on exp function algorithm: - Reduced x = log2(e) * (hi + mid1 + mid2) + lo, where: * hi is an integer * mid1 * 2^-6 is an integer * mid2 * 2^-12 is an integer * |lo| < 2^-13 + 2^-30 - Then exp(x) - 1 = 2^hi * 2^mid1 * 2^mid2 * exp(lo) - 1 ~ 2^hi * (2^mid1 * 2^mid2 * (1 + lo * P(lo)) - 2^(-hi) ) - We evaluate fast pass with P(lo) is a degree-3 Taylor polynomial of (e^lo - 1) / lo in double precision - If the Ziv accuracy test fails, we use degree-6 Taylor polynomial of (e^lo - 1) / lo in double double precision - If the Ziv accuracy test still fails, we re-evaluate everything in 128-bit precision.		2023-09-28 16:43:15 -04:00
..
arm	[libc][math] Implement double precision expm1 function correctly rounded for all rounding modes. (#67048)	2023-09-28 16:43:15 -04:00
x86_64	[libc] Add memmem implementation	2023-04-11 20:49:25 +00:00