1. 17 8月, 2020 1 次提交
  2. 18 4月, 2019 1 次提交
    • S
      math: new exp and exp2 · e16f7b3c
      Szabolcs Nagy 提交于
      from https://github.com/ARM-software/optimized-routines,
      commit 04884bd04eac4b251da4026900010ea7d8850edc
      
      TOINT_INTRINSICS and EXP_USE_TOINT_NARROW cases are unused.
      
      The underflow exception is signaled if the result is in the subnormal
      range even if the result is exact (e.g. exp2(-1023.0)).
      
      code size change: -1672 bytes.
      benchmark on x86_64 before, after, speedup:
      
      -Os:
         exp rthruput:  12.73 ns/call  6.68 ns/call 1.91x
          exp latency:  45.78 ns/call 21.79 ns/call 2.1x
        exp2 rthruput:   6.35 ns/call  5.26 ns/call 1.21x
         exp2 latency:  26.00 ns/call 16.58 ns/call 1.57x
      -O3:
         exp rthruput:  12.75 ns/call  6.73 ns/call 1.89x
          exp latency:  45.91 ns/call 21.80 ns/call 2.11x
        exp2 rthruput:   6.47 ns/call  5.40 ns/call 1.2x
         exp2 latency:  26.03 ns/call 16.54 ns/call 1.57x
      e16f7b3c
  3. 07 9月, 2013 1 次提交
    • S
      math: remove STRICT_ASSIGN macro · 9b0fcb44
      Szabolcs Nagy 提交于
      gcc did not always drop excess precision according to c99 at assignments
      before version 4.5 even if -std=c99 was requested which caused badly
      broken mathematical functions on i386 when FLT_EVAL_METHOD!=0
      
      but STRICT_ASSIGN was not used consistently and it is worked around for
      old compilers with -ffloat-store so it is no longer needed
      
      the new convention is to get the compiler respect c99 semantics and when
      excess precision is not harmful use float_t or double_t or to specialize
      code using FLT_EVAL_METHOD
      9b0fcb44
  4. 05 9月, 2013 1 次提交
    • S
      math: fix underflow in exp*.c and long double handling in exp2l · 39c910fb
      Szabolcs Nagy 提交于
      * don't care about inexact flag
      * use double_t and float_t (faster, smaller, more precise on x86)
      * exp: underflow when result is zero or subnormal and not -inf
      * exp2: underflow when result is zero or subnormal and not exact
      * expm1: underflow when result is zero or subnormal
      * expl: don't underflow on -inf
      * exp2: fix incorrect comment
      * expm1: simplify special case handling and overflow properly
      * expm1: cleanup final scaling and fix negative left shift ub (twopk)
      39c910fb
  5. 18 11月, 2012 1 次提交
  6. 18 3月, 2012 1 次提交
  7. 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