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| author | Alexander Monakov <amonakov@ispras.ru> | 2020-01-05 18:47:02 +0300 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2020-03-24 16:27:06 -0400 |
| commit | 87026f6843f45573d6ac93c791c0597ba7f4e693 (patch) | |
| tree | 100b2f71cceb6e64a3b492b3fe2727616de458e4 /src/math/x86_64/fabsf.c | |
| parent | 33338ebc853d37c80f0f236cc7a92cb0acc6aace (diff) | |
| download | musl-87026f6843f45573d6ac93c791c0597ba7f4e693.tar.gz musl-87026f6843f45573d6ac93c791c0597ba7f4e693.tar.xz musl-87026f6843f45573d6ac93c791c0597ba7f4e693.zip | |
math: move x86_64 fabs, fabsf to C with inline asm
Diffstat (limited to 'src/math/x86_64/fabsf.c')
| -rw-r--r-- | src/math/x86_64/fabsf.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/math/x86_64/fabsf.c b/src/math/x86_64/fabsf.c new file mode 100644 index 00000000..36ea7481 --- /dev/null +++ b/src/math/x86_64/fabsf.c @@ -0,0 +1,10 @@ +#include <math.h> + +float fabsf(float x) +{ + float t; + __asm__ ("pcmpeqd %0, %0" : "=x"(t)); // t = ~0 + __asm__ ("psrld $1, %0" : "+x"(t)); // t >>= 1 + __asm__ ("andps %1, %0" : "+x"(x) : "x"(t)); // x &= t + return x; +} |