diff options
Diffstat (limited to 'sysdeps/i386/fpu/s_ilogb.S')
| -rw-r--r-- | sysdeps/i386/fpu/s_ilogb.S | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/s_ilogb.S b/sysdeps/i386/fpu/s_ilogb.S index 36fb000c02..68d9c1a680 100644 --- a/sysdeps/i386/fpu/s_ilogb.S +++ b/sysdeps/i386/fpu/s_ilogb.S @@ -9,6 +9,16 @@ RCSID("$NetBSD: s_ilogb.S,v 1.5 1995/10/12 15:53:09 jtc Exp $") ENTRY(__ilogb) fldl 4(%esp) +/* I added the following ugly construct because ilogb(+-Inf) is + required to return INT_MAX in ISO C99. + -- jakub@redhat.com. */ + fxam /* Is NaN or +-Inf? */ + fstsw %ax + movb $0x45, %dh + andb %ah, %dh + cmpb $0x05, %dh + je 1f /* Is +-Inf, jump. */ + fxtract pushl %eax fstp %st @@ -18,5 +28,9 @@ ENTRY(__ilogb) popl %eax ret + +1: fstp %st + movl $0x7fffffff, %eax + ret END (__ilogb) weak_alias (__ilogb, ilogb) |