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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2012-04-11 16:30:13 -0300 |
|---|---|---|
| committer | Andreas Jaeger <aj@suse.de> | 2012-04-17 22:12:53 +0200 |
| commit | 76da7265320010c7a273ed99f53938c0f32d5fad (patch) | |
| tree | f094871a5f38652d2d320a11423fee602a8746e6 /sysdeps/i386/fpu/s_ilogb.S | |
| parent | 0396e69dbefb3630651d93e0a7526c4326a071bb (diff) | |
| download | glibc-76da7265320010c7a273ed99f53938c0f32d5fad.tar.gz glibc-76da7265320010c7a273ed99f53938c0f32d5fad.tar.xz glibc-76da7265320010c7a273ed99f53938c0f32d5fad.zip | |
Fix ilogb exception and errno (bug 6794)
[BZ #6794] Following Joseph comments about bug 6794, here is a proposed fix. It turned out to be a large fix mainly because I had to move some file along to follow libm files/names conventions. Basically I have added wrappers (w_ilogb.c, w_ilogbf.c, w_ilogbl.c) that now calls the symbol '__ieee754_ilogb'. The wrappers checks for '__ieee754_ilogb' output and set the errno and raise exceptions as expected. The '__ieee754_ilogb' is implemented in sysdeps. I have moved the 's_ilogb[f|l]' files to e_ilogb[f|l] and renamed the '__ilogb[f|l]' to '__ieee754_ilogb[f|l]'. I also found out a bug in i386 and x86-64 assembly coded ilogb implementation where it raises a FE_DIVBYZERO when argument is '0.0'. I corrected this issue as well. Finally I added the errno and FE_INVALID tests for 0.0, NaN and +-InF argument. Tested on i386, x86-64, ppc32 and ppc64.
Diffstat (limited to 'sysdeps/i386/fpu/s_ilogb.S')
| -rw-r--r-- | sysdeps/i386/fpu/s_ilogb.S | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/sysdeps/i386/fpu/s_ilogb.S b/sysdeps/i386/fpu/s_ilogb.S deleted file mode 100644 index 0cf1ad7419..0000000000 --- a/sysdeps/i386/fpu/s_ilogb.S +++ /dev/null @@ -1,38 +0,0 @@ -/* - * Written by J.T. Conklin <jtc@netbsd.org>. - * Public domain. - */ - -#include <machine/asm.h> - -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 - cfi_adjust_cfa_offset (4) - fstp %st - - fistpl (%esp) - fwait - popl %eax - cfi_adjust_cfa_offset (-4) - - ret - -1: fstp %st - movl $0x7fffffff, %eax - ret -END (__ilogb) -weak_alias (__ilogb, ilogb) |