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Diffstat (limited to 'libm/powerpc/s_ldexp.c')
| -rw-r--r-- | libm/powerpc/s_ldexp.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/libm/powerpc/s_ldexp.c b/libm/powerpc/s_ldexp.c new file mode 100644 index 000000000..0e9a66611 --- /dev/null +++ b/libm/powerpc/s_ldexp.c @@ -0,0 +1,47 @@ +/******************************************************************************* +* * +* File frexpldexp.c, * +* Functions frexp(x) and ldexp(x), * +* Implementation of frexp and ldexp functions for the PowerPC. * +* * +* Copyright © 1991 Apple Computer, Inc. All rights reserved. * +* * +* Written by Ali Sazegari, started on January 1991, * +* * +* W A R N I N G: This routine expects a 64 bit double model. * +* * +* December03 1992: first rs6000 implementation. * +* October 05 1993: added special cases for NaN and ° in frexp. * +* May 27 1997: improved the performance of frexp by eliminating the * +* switch statement. * +* June 13 2001: (ram) rewrote frexp to eliminate calls to scalb and * +* logb. * +* * +*******************************************************************************/ + +#include <limits.h> +#include <math.h> + +typedef union + { + struct { +#if defined(__BIG_ENDIAN__) + unsigned long int hi; + unsigned long int lo; +#else + unsigned long int lo; + unsigned long int hi; +#endif + } words; + double dbl; + } DblInHex; + +double ldexp ( double value, int exp ) + { + if ( exp > SHRT_MAX ) + exp = SHRT_MAX; + else if ( exp < -SHRT_MAX ) + exp = -SHRT_MAX; + return scalb ( value, exp ); + } + |