diff options
Diffstat (limited to 'sysdeps/i386/fpu/s_ilogbl.S')
| -rw-r--r-- | sysdeps/i386/fpu/s_ilogbl.S | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/s_ilogbl.S b/sysdeps/i386/fpu/s_ilogbl.S index 1dad93abeb..ed547bdc8b 100644 --- a/sysdeps/i386/fpu/s_ilogbl.S +++ b/sysdeps/i386/fpu/s_ilogbl.S @@ -10,6 +10,16 @@ RCSID("$NetBSD: $") ENTRY(__ilogbl) fldt 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 @@ -19,5 +29,9 @@ ENTRY(__ilogbl) popl %eax ret + +1: fstp %st + movl $0x7fffffff, %eax + ret END (__ilogbl) weak_alias (__ilogbl, ilogbl) |