sysdeps/i386/fpu/s_floorl.S

   1 /*
   2  * Public domain.
   3  */
   4
   5 #include <libm-alias-ldouble.h>
   6 #include <machine/asm.h>
   7
   8 RCSID("$NetBSD: $")
   9
  10 ENTRY(__floorl)
  11         fldt    4(%esp)
  12         subl    $32,%esp
  13         cfi_adjust_cfa_offset (32)
  14
  15         fnstenv 4(%esp)                 /* store fpu environment */
  16
  17         /* We use here %edx although only the low 1 bits are defined.
  18            But none of the operations should care and they are faster
  19            than the 16 bit operations.  */
  20         movl    $0x400,%edx             /* round towards -oo */
  21         orl     4(%esp),%edx
  22         andl    $0xf7ff,%edx
  23         movl    %edx,(%esp)
  24         fldcw   (%esp)                  /* load modified control word */
  25
  26         frndint                         /* round */
  27
  28         /* Preserve "invalid" exceptions from sNaN input.  */
  29         fnstsw
  30         andl    $0x1, %eax
  31         orl     %eax, 8(%esp)
  32
  33         fldenv  4(%esp)                 /* restore original environment */
  34
  35         addl    $32,%esp
  36         cfi_adjust_cfa_offset (-32)
  37         ret
  38 END (__floorl)
  39 libm_alias_ldouble (__floor, floor)