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| author | Alexander Monakov <amonakov@ispras.ru> | 2020-01-06 20:31:47 +0300 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2020-03-24 16:31:36 -0400 |
| commit | 29adaeb2c0e795e75044a9b678b8cc66570f7e95 (patch) | |
| tree | 223b97dc91e5c78692246b93eaa16989dbf8cf1d /src/math/i386 | |
| parent | 41b290ba397067a09525b6ac89b4040728349046 (diff) | |
| download | musl-29adaeb2c0e795e75044a9b678b8cc66570f7e95.tar.gz musl-29adaeb2c0e795e75044a9b678b8cc66570f7e95.tar.bz2 musl-29adaeb2c0e795e75044a9b678b8cc66570f7e95.tar.xz musl-29adaeb2c0e795e75044a9b678b8cc66570f7e95.zip | |
math: move i386 sqrtf to C with inline asm
Diffstat (limited to 'src/math/i386')
| -rw-r--r-- | src/math/i386/sqrtf.c | 12 | ||||
| -rw-r--r-- | src/math/i386/sqrtf.s | 7 |
2 files changed, 12 insertions, 7 deletions
diff --git a/src/math/i386/sqrtf.c b/src/math/i386/sqrtf.c new file mode 100644 index 00000000..41c65c2b --- /dev/null +++ b/src/math/i386/sqrtf.c @@ -0,0 +1,12 @@ +#include <math.h> + +float sqrtf(float x) +{ + long double t; + /* The long double result has sufficient precision so that + * second rounding to float still keeps the returned value + * correctly rounded, see Pierre Roux, "Innocuous Double + * Rounding of Basic Arithmetic Operations". */ + __asm__ ("fsqrt" : "=t"(t) : "0"(x)); + return (float)t; +} diff --git a/src/math/i386/sqrtf.s b/src/math/i386/sqrtf.s deleted file mode 100644 index 9e944f45..00000000 --- a/src/math/i386/sqrtf.s +++ /dev/null @@ -1,7 +0,0 @@ -.global sqrtf -.type sqrtf,@function -sqrtf: flds 4(%esp) - fsqrt - fstps 4(%esp) - flds 4(%esp) - ret |