diff options
Diffstat (limited to 'sysdeps/x86_64/fpu/s_floorl.S')
| -rw-r--r-- | sysdeps/x86_64/fpu/s_floorl.S | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/s_floorl.S b/sysdeps/x86_64/fpu/s_floorl.S new file mode 100644 index 0000000000..f9ecc388df --- /dev/null +++ b/sysdeps/x86_64/fpu/s_floorl.S @@ -0,0 +1,30 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Changes for long double by Ulrich Drepper <drepper@cygnus.com> + * Changes for x86-64 by Andreas Jaeger <aj@suse.de>=09 + * Public domain. + */ + +#include <machine/asm.h> + +ENTRY(__floorl) + fldt 8(%rsp) + + fstcw -4(%rsp) /* store fpu control word */ + + /* We use here %edx although only the low 1 bits are defined. + But none of the operations should care and they are faster + than the 16 bit operations. */ + movl $0x400,%edx /* round towards -oo */ + orl -4(%rsp),%edx + andl $0xf7ff,%edx + movl %edx,-8(%rsp) + fldcw -8(%rsp) /* load modified control word */ + + frndint /* round */ + + fldcw -4(%rsp) /* restore original control word */ + + ret +END (__floorl) +weak_alias (__floorl, floorl) |