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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/x86_64/fpu | |
| 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/x86_64/fpu')
| -rw-r--r-- | sysdeps/x86_64/fpu/e_ilogbl.S (renamed from sysdeps/x86_64/fpu/s_ilogbl.S) | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/sysdeps/x86_64/fpu/s_ilogbl.S b/sysdeps/x86_64/fpu/e_ilogbl.S index f59040c11e..44f92159a8 100644 --- a/sysdeps/x86_64/fpu/s_ilogbl.S +++ b/sysdeps/x86_64/fpu/e_ilogbl.S @@ -7,7 +7,7 @@ #include <machine/asm.h> -ENTRY(__ilogbl) +ENTRY(__ieee754_ilogbl) fldt 8(%rsp) /* I added the following ugly construct because ilogb(+-Inf) is required to return INT_MAX in ISO C99. @@ -18,6 +18,8 @@ ENTRY(__ilogbl) andb %ah, %dh cmpb $0x05, %dh je 1f /* Is +-Inf, jump. */ + cmpb $0x40, %dh + je 2f /* Is +-Inf, jump. */ fxtract fstp %st @@ -31,5 +33,8 @@ ENTRY(__ilogbl) 1: fstp %st movl $0x7fffffff, %eax ret -END (__ilogbl) -weak_alias (__ilogbl, ilogbl) +2: fstp %st + movl $0x80000000, %eax /* FP_ILOGB0 */ + ret +END (__ieee754_ilogbl) +weak_alias (__ieee754_ilogbl, __ilogbl_finite) |