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author | Szabolcs Nagy <nsz@port70.net> | 2017-03-19 05:26:45 +0100 |
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committer | Rich Felker <dalias@aerifal.cx> | 2017-03-21 12:39:18 -0400 |
commit | 54807d47acecab778498ced88ce8f62bfa16e379 (patch) | |
tree | 2203cc44d6061f092dd104ef6f89d4f2ca9fa1d7 /src/math/finitef.c | |
parent | b6e1fe0d5e78dac647e85d49c2d537bb071ba49e (diff) | |
download | musl-54807d47acecab778498ced88ce8f62bfa16e379.tar.gz musl-54807d47acecab778498ced88ce8f62bfa16e379.tar.xz musl-54807d47acecab778498ced88ce8f62bfa16e379.zip |
aarch64: add single instruction math functions
this should increase performance and reduce code size on aarch64. the compiled code was checked against using __builtin_* instead of inline asm with gcc-6.2.0. lrint is two instructions. c with inline asm is used because it is safer than a pure asm implementation, this prevents ll{rint,round} to be an alias of l{rint,round} (because the types don't match) and depends on gcc style inline asm support. ceil, floor, round, trunc can either raise inexact on finite non-integer inputs or not raise any exceptions. the new implementation does not raise exceptions while the generic c code does. on aarch64, the underflow exception is signaled before rounding (ieee 754 allows both before and after rounding, but it must be consistent), the generic fma c code signals it after rounding so using single instruction fixes a slight conformance issue too.
Diffstat (limited to 'src/math/finitef.c')
0 files changed, 0 insertions, 0 deletions