diff options
| author | Alexander Monakov <amonakov@ispras.ru> | 2020-01-15 18:42:46 +0300 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2020-03-24 16:31:36 -0400 |
| commit | bc87299ce72a52f4debf9fc19d859abe34dbdf43 (patch) | |
| tree | 95763fe2cf648fe78c7cf2ce273d86b589050152 /src | |
| parent | b173e4262f65800ea488b4494125284779a61547 (diff) | |
| download | musl-bc87299ce72a52f4debf9fc19d859abe34dbdf43.tar.gz | |
math: move x87-family fmod functions to C with inline asm
Diffstat (limited to 'src')
| -rw-r--r-- | src/math/i386/fmod.c | 10 | ||||
| -rw-r--r-- | src/math/i386/fmod.s | 11 | ||||
| -rw-r--r-- | src/math/i386/fmodf.c | 10 | ||||
| -rw-r--r-- | src/math/i386/fmodf.s | 11 | ||||
| -rw-r--r-- | src/math/i386/fmodl.c | 9 | ||||
| -rw-r--r-- | src/math/i386/fmodl.s | 11 | ||||
| -rw-r--r-- | src/math/x86_64/fmodl.c | 9 | ||||
| -rw-r--r-- | src/math/x86_64/fmodl.s | 11 |
8 files changed, 38 insertions, 44 deletions
diff --git a/src/math/i386/fmod.c b/src/math/i386/fmod.c new file mode 100644 index 00000000..ea0c58d9 --- /dev/null +++ b/src/math/i386/fmod.c @@ -0,0 +1,10 @@ +#include <math.h> + +double fmod(double x, double y) +{ + unsigned short fpsr; + // fprem does not introduce excess precision into x + do __asm__ ("fprem; fnstsw %%ax" : "+t"(x), "=a"(fpsr) : "u"(y)); + while (fpsr & 0x400); + return x; +} diff --git a/src/math/i386/fmod.s b/src/math/i386/fmod.s deleted file mode 100644 index 2113b3c5..00000000 --- a/src/math/i386/fmod.s +++ /dev/null @@ -1,11 +0,0 @@ -.global fmod -.type fmod,@function -fmod: - fldl 12(%esp) - fldl 4(%esp) -1: fprem - fnstsw %ax - sahf - jp 1b - fstp %st(1) - ret diff --git a/src/math/i386/fmodf.c b/src/math/i386/fmodf.c new file mode 100644 index 00000000..90b56ab0 --- /dev/null +++ b/src/math/i386/fmodf.c @@ -0,0 +1,10 @@ +#include <math.h> + +float fmodf(float x, float y) +{ + unsigned short fpsr; + // fprem does not introduce excess precision into x + do __asm__ ("fprem; fnstsw %%ax" : "+t"(x), "=a"(fpsr) : "u"(y)); + while (fpsr & 0x400); + return x; +} diff --git a/src/math/i386/fmodf.s b/src/math/i386/fmodf.s deleted file mode 100644 index e04e2a56..00000000 --- a/src/math/i386/fmodf.s +++ /dev/null @@ -1,11 +0,0 @@ -.global fmodf -.type fmodf,@function -fmodf: - flds 8(%esp) - flds 4(%esp) -1: fprem - fnstsw %ax - sahf - jp 1b - fstp %st(1) - ret diff --git a/src/math/i386/fmodl.c b/src/math/i386/fmodl.c new file mode 100644 index 00000000..3daeab06 --- /dev/null +++ b/src/math/i386/fmodl.c @@ -0,0 +1,9 @@ +#include <math.h> + +long double fmodl(long double x, long double y) +{ + unsigned short fpsr; + do __asm__ ("fprem; fnstsw %%ax" : "+t"(x), "=a"(fpsr) : "u"(y)); + while (fpsr & 0x400); + return x; +} diff --git a/src/math/i386/fmodl.s b/src/math/i386/fmodl.s deleted file mode 100644 index 0cb3fe9b..00000000 --- a/src/math/i386/fmodl.s +++ /dev/null @@ -1,11 +0,0 @@ -.global fmodl -.type fmodl,@function -fmodl: - fldt 16(%esp) - fldt 4(%esp) -1: fprem - fnstsw %ax - sahf - jp 1b - fstp %st(1) - ret diff --git a/src/math/x86_64/fmodl.c b/src/math/x86_64/fmodl.c new file mode 100644 index 00000000..3daeab06 --- /dev/null +++ b/src/math/x86_64/fmodl.c @@ -0,0 +1,9 @@ +#include <math.h> + +long double fmodl(long double x, long double y) +{ + unsigned short fpsr; + do __asm__ ("fprem; fnstsw %%ax" : "+t"(x), "=a"(fpsr) : "u"(y)); + while (fpsr & 0x400); + return x; +} diff --git a/src/math/x86_64/fmodl.s b/src/math/x86_64/fmodl.s deleted file mode 100644 index ea07b402..00000000 --- a/src/math/x86_64/fmodl.s +++ /dev/null @@ -1,11 +0,0 @@ -.global fmodl -.type fmodl,@function -fmodl: - fldt 24(%rsp) - fldt 8(%rsp) -1: fprem - fnstsw %ax - testb $4,%ah - jnz 1b - fstp %st(1) - ret |