diff options
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; +} |