1. 17 8月, 2020 1 次提交
  2. 31 10月, 2014 1 次提交
    • S
      math: use the rounding idiom consistently · 0ce946cf
      Szabolcs Nagy 提交于
      the idiomatic rounding of x is
      
        n = x + toint - toint;
      
      where toint is either 1/EPSILON (x is non-negative) or 1.5/EPSILON
      (x may be negative and nearest rounding mode is assumed) and EPSILON is
      according to the evaluation precision (the type of toint is not very
      important, because single precision float can represent the 1/EPSILON of
      ieee binary128).
      
      in case of FLT_EVAL_METHOD!=0 this avoids a useless store to double or
      float precision, and the long double code became cleaner with
      1/LDBL_EPSILON instead of ifdefs for toint.
      
      __rem_pio2f and __rem_pio2 functions slightly changed semantics:
      on i386 a double-rounding is avoided so close to half-way cases may
      get evaluated differently eg. as sin(pi/4-eps) instead of cos(pi/4+eps)
      0ce946cf
  3. 05 9月, 2013 1 次提交
    • S
      math: rewrite rounding functions (ceil, floor, trunc, round, rint) · d1a2ead8
      Szabolcs Nagy 提交于
      * faster, smaller, cleaner implementation than the bit hacks of fdlibm
      * use arithmetics like y=(double)(x+0x1p52)-0x1p52, which is an integer
      neighbor of x in all rounding modes (0<=x<0x1p52) and only use bithacks
      when that's faster and smaller (for float it usually is)
      * the code assumes standard excess precision handling for casts
      * long double code supports both ld80 and ld128
      * nearbyint is not changed (it is a wrapper around rint)
      d1a2ead8
  4. 29 3月, 2012 1 次提交
  5. 13 3月, 2012 1 次提交
    • R
      first commit of the new libm! · b69f695a
      Rich Felker 提交于
      thanks to the hard work of Szabolcs Nagy (nsz), identifying the best
      (from correctness and license standpoint) implementations from freebsd
      and openbsd and cleaning them up! musl should now fully support c99
      float and long double math functions, and has near-complete complex
      math support. tgmath should also work (fully on gcc-compatible
      compilers, and mostly on any c99 compiler).
      
      based largely on commit 0376d44a890fea261506f1fc63833e7a686dca19 from
      nsz's libm git repo, with some additions (dummy versions of a few
      missing long double complex functions, etc.) by me.
      
      various cleanups still need to be made, including re-adding (if
      they're correct) some asm functions that were dropped.
      b69f695a