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-rw-r--r--libm/powerpc/classic/s_ceil.c113
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diff --git a/libm/powerpc/classic/s_ceil.c b/libm/powerpc/classic/s_ceil.c
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-/*******************************************************************************
-* *
-* File ceilfloor.c, *
-* Function ceil(x) and floor(x), *
-* Implementation of ceil and floor for the PowerPC. *
-* *
-* Copyright 1991 Apple Computer, Inc. All rights reserved. *
-* *
-* Written by Ali Sazegari, started on November 1991, *
-* *
-* based on math.h, library code for Macintoshes with a 68881/68882 *
-* by Jim Thomas. *
-* *
-* W A R N I N G: This routine expects a 64 bit double model. *
-* *
-* December 03 1992: first rs6000 port. *
-* July 14 1993: comment changes and addition of #pragma fenv_access. *
-* May 06 1997: port of the ibm/taligent ceil and floor routines. *
-* April 11 2001: first port to os x using gcc. *
-* June 13 2001: replaced __setflm with in-line assembly *
-* *
-*******************************************************************************/
-
-#include <math.h>
-#include <endian.h>
-
-static const double twoTo52 = 4503599627370496.0;
-static const unsigned long signMask = 0x80000000ul;
-
-typedef union
- {
- struct {
-#if (__BYTE_ORDER == __BIG_ENDIAN)
- unsigned long int hi;
- unsigned long int lo;
-#else
- unsigned long int lo;
- unsigned long int hi;
-#endif
- } words;
- double dbl;
- } DblInHex;
-
-/*******************************************************************************
-* Functions needed for the computation. *
-*******************************************************************************/
-
-/*******************************************************************************
-* Ceil(x) returns the smallest integer not less than x. *
-*******************************************************************************/
-
-libm_hidden_proto(ceil)
-double ceil ( double x )
- {
- DblInHex xInHex,OldEnvironment;
- register double y;
- register unsigned long int xhi;
- register int target;
-
- xInHex.dbl = x;
- xhi = xInHex.words.hi & 0x7fffffffUL; // xhi is the high half of |x|
- target = ( xInHex.words.hi < signMask );
-
- if ( xhi < 0x43300000ul )
-/*******************************************************************************
-* Is |x| < 2.0^52? *
-*******************************************************************************/
- {
- if ( xhi < 0x3ff00000ul )
-/*******************************************************************************
-* Is |x| < 1.0? *
-*******************************************************************************/
- {
- if ( ( xhi | xInHex.words.lo ) == 0ul ) // zero x is exact case
- return ( x );
- else
- { // inexact case
- __asm__ ("mffs %0" : "=f" (OldEnvironment.dbl));
- OldEnvironment.words.lo |= 0x02000000ul;
- __asm__ ("mtfsf 255,%0" : /*NULLOUT*/ : /*IN*/ "f" ( OldEnvironment.dbl ));
- if ( target )
- return ( 1.0 );
- else
- return ( -0.0 );
- }
- }
-/*******************************************************************************
-* Is 1.0 < |x| < 2.0^52? *
-*******************************************************************************/
- if ( target )
- {
- y = ( x + twoTo52 ) - twoTo52; // round at binary pt.
- if ( y < x )
- return ( y + 1.0 );
- else
- return ( y );
- }
-
- else
- {
- y = ( x - twoTo52 ) + twoTo52; // round at binary pt.
- if ( y < x )
- return ( y + 1.0 );
- else
- return ( y );
- }
- }
-/*******************************************************************************
-* |x| >= 2.0^52 or x is a NaN. *
-*******************************************************************************/
- return ( x );
- }
-libm_hidden_def(ceil)