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| author | Jeff Johnston <jjohnstn@redhat.com> | 2010-02-11 21:00:33 +0000 |
|---|---|---|
| committer | Jeff Johnston <jjohnstn@redhat.com> | 2010-02-11 21:00:33 +0000 |
| commit | 451a8eb09ae2bb2484ffc76da5854ea9983dd643 (patch) | |
| tree | 3e85c785115ddb0725f3dce2467676098106d3de /newlib/libm/common/sf_ilogb.c | |
| parent | 9bb1d645b3c8b708334f032da2764908bfcfe58c (diff) | |
| download | cygnal-451a8eb09ae2bb2484ffc76da5854ea9983dd643.tar.gz cygnal-451a8eb09ae2bb2484ffc76da5854ea9983dd643.tar.bz2 cygnal-451a8eb09ae2bb2484ffc76da5854ea9983dd643.zip | |
2010-02-11 Craig Howland <howland@LGSInnovations.com>
* libm/common/s_ilogb.c: Adjust documentation to reflect new returns
(see next items) and that ilogb() and ilogbf() are C99/POSIX.
* libm/common/s_ilogb.c (ilogb): Use C99/POSIX FP_ILOGB0 and
FP_ILOGBNAN returns for 0 and NAN arguments, respectively, instead of
the prior -INT_MAX and INT_MAX. The FP_ILOGBx defines in math.h
presently match the prior hard-codes, so no functional change is
actually introduced. (Not at this time, nor planned, but the values
are permitted to be different, so subsequent edits of math.h could
possibly cause a functional change.)
* libm/common/sf_ilogb.c (ilogbf): Ditto.
Diffstat (limited to 'newlib/libm/common/sf_ilogb.c')
| -rw-r--r-- | newlib/libm/common/sf_ilogb.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/newlib/libm/common/sf_ilogb.c b/newlib/libm/common/sf_ilogb.c index ec59406e1..28191c2c6 100644 --- a/newlib/libm/common/sf_ilogb.c +++ b/newlib/libm/common/sf_ilogb.c @@ -13,8 +13,8 @@ * ==================================================== */ -#include "fdlibm.h" #include <limits.h> +#include "fdlibm.h" #ifdef __STDC__ int ilogbf(float x) @@ -28,11 +28,14 @@ GET_FLOAT_WORD(hx,x); hx &= 0x7fffffff; if(FLT_UWORD_IS_ZERO(hx)) - return - INT_MAX; /* ilogb(0) = 0x80000001 */ + return FP_ILOGB0; /* ilogb(0) = special case error */ if(FLT_UWORD_IS_SUBNORMAL(hx)) { for (ix = -126,hx<<=8; hx>0; hx<<=1) ix -=1; return ix; } + #if FP_ILOGBNAN != INT_MAX + else if (FLT_UWORD_IS_NAN(hx)) return FP_ILOGBNAN; /* NAN */ + #endif else if (!FLT_UWORD_IS_FINITE(hx)) return INT_MAX; else return (hx>>23)-127; } |