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Diffstat (limited to 'libm/sign.c')
| -rw-r--r-- | libm/sign.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/libm/sign.c b/libm/sign.c new file mode 100644 index 000000000..524d6afe3 --- /dev/null +++ b/libm/sign.c @@ -0,0 +1,58 @@ +#if defined(__ppc__) +/******************************************************************************* +* * +* File sign.c, * +* Functions copysign and __signbitd. * +* For PowerPC based machines. * +* * +* Copyright © 1991, 2001 Apple Computer, Inc. All rights reserved. * +* * +* Written by Ali Sazegari, started on June 1991. * +* * +* August 26 1991: no CFront Version 1.1d17 warnings. * +* September 06 1991: passes the test suite with invalid raised on * +* signaling nans. sane rom code behaves the same. * +* September 24 1992: took the ̉#include support.hÓ out. * +* Dcember 02 1992: PowerPC port. * +* July 20 1994: __fabs added * +* July 21 1994: deleted unnecessary functions: neg, COPYSIGNnew, * +* and SIGNNUMnew. * +* April 11 2001: first port to os x using gcc. * +* removed fabs and deffered to gcc for direct * +* instruction generation. * +* * +*******************************************************************************/ + +#include "fp_private.h" + +/******************************************************************************* +* * +* Function copysign. * +* Implementation of copysign for the PowerPC. * +* * +******************************************************************************** +* Note: The order of the operands in this function is reversed from that * +* suggested in the IEEE standard 754. * +*******************************************************************************/ + +double copysign ( double arg2, double arg1 ) + { + union + { + dHexParts hex; + double dbl; + } x, y; + +/******************************************************************************* +* No need to flush NaNs out. * +*******************************************************************************/ + + x.dbl = arg1; + y.dbl = arg2; + + y.hex.high = y.hex.high & 0x7FFFFFFF; + y.hex.high = ( y.hex.high | ( x.hex.high & dSgnMask ) ); + + return y.dbl; + } +#endif /* __ppc__ */ |