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authorAlexander Monakov <amonakov@ispras.ru>2020-01-15 18:42:46 +0300
committerRich Felker <dalias@aerifal.cx>2020-03-24 16:31:36 -0400
commitbc87299ce72a52f4debf9fc19d859abe34dbdf43 (patch)
tree95763fe2cf648fe78c7cf2ce273d86b589050152 /src/math/i386/fmodf.c
parentb173e4262f65800ea488b4494125284779a61547 (diff)
downloadmusl-bc87299ce72a52f4debf9fc19d859abe34dbdf43.tar.gz
math: move x87-family fmod functions to C with inline asm
Diffstat (limited to 'src/math/i386/fmodf.c')
-rw-r--r--src/math/i386/fmodf.c10
1 files changed, 10 insertions, 0 deletions
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;
+}