Rework the math library tests per the glibc math test code, with

many unsupported tests disabled for the moment.
 -Erik

1 files changed, 0 insertions, 850 deletions

diff --git a/test/math/ieetst.c b/test/math/ieetst.c
deleted file mode 100644
index 8c2453898..000000000
--- a/test/math/ieetst.c
+++ /dev/null
@@ -1,850 +0,0 @@
-/* Floating point to ASCII input and output string test program.
- *
- * Numbers in the native machine data structure are converted
- * to e type, then to and from decimal ASCII strings.  Native
- * printf() and scanf() functions are also used to produce
- * and read strings.  The resulting e type binary values
- * are compared, with diagnostic printouts of any discrepancies.
- *
- * Steve Moshier, 16 Dec 88
- * last revision: 16 May 92
- */
-
-#include "ehead.h"
-#include "mconf.h"
-
-/* Include tests of 80-bit long double precision: */
-#define LDOUBLE 0
-/* Abort subtest after getting this many errors: */
-#define MAXERR 5
-/* Number of random arguments to try (set as large as you have
- * patience for): */
-#define NRAND 100
-/* Perform internal consistency test: */
-#define CHKINTERNAL 0
-
-static unsigned short fullp[NE], rounded[NE];
-float prec24, sprec24, ssprec24;
-double prec53, sprec53, ssprec53;
-#if LDOUBLE
-long double prec64, sprec64, ssprec64;
-#endif
-
-static unsigned short rprint[NE], rscan[NE];
-static unsigned short q1[NE], q2[NE], q5[NE];
-static unsigned short e1[NE], e2[NE], e3[NE];
-static double d1, d2;
-static int errprint = 0;
-static int errscan = 0;
-static int identerr = 0;
-static int errtot = 0;
-static int count = 0;
-static char str0[80], str1[80], str2[80], str3[80];
-static unsigned short eten[NE], maxm[NE];
-
-int m, n, k2, mprec, SPREC;
-
-char *Ten = "10.0";
-char tformat[10];
-char *format24 = "%.8e";
-#ifdef DEC
-char *format53 = "%.17e";
-#else
-char *format53 = "%.16e";
-#endif
-char *fformat24 = "%e";
-char *fformat53 = "%le";
-char *pct = "%";
-char *quo = "\042";
-#if LDOUBLE
-char *format64 = "%.20Le";
-char *fformat64 = "%Le";
-#endif
-char *format;
-char *fformat;
-char *toomany = "Too many errors; aborting this test.\n";
-
-static int mnrflag;
-static int etrflag;
-void chkit(), printerr(), mnrand(), etrand(), shownoncrit();
-void chkid(), pvec();
-
-main()
-{
-int i, iprec;
-
-printf( "Steve Moshier's printf/scanf tester, version 0.2.\n\n" );
-#ifdef DEC
- /* DEC PDP-11/VAX single precision not yet implemented */
-for( iprec = 1; iprec<2; iprec++ )
-#else
-for( iprec = 0; iprec<3; iprec++ )
-#endif
-	{
-	errscan = 0;
-	identerr = 0;
-	errprint = 0;
-	eclear( rprint );
-	eclear( rscan );
-
-switch( iprec )
-	{
-	case 0:
-		SPREC = 8; /* # digits after the decimal point */
-		mprec = 24; /* # bits in the significand */
-		m = 9; /* max # decimal digits for correct rounding */
-		n = 13; /* max power of ten for correct rounding */
-		k2 = -125; /* underflow beyond 2^-k2 */
-		format = format24; /* printf format string */
-		fformat = fformat24; /* scanf format string */
-		mnrflag = 1; /* sets interval for random numbers */
-		etrflag = 1;
-		printf( "Testing FLOAT precision.\n" );
-		break;
-
-	case 1:
-#ifdef DEC
-		SPREC = 17;
-		mprec = 56;
-		m = 17;
-		n = 27;
-		k2 = -125;
-		format = format53;
-		fformat = fformat53;
-		mnrflag = 2;
-		etrflag = 1;
-		printf( "Testing DEC DOUBLE precision.\n" );
-		break;
-#else
-		SPREC = 16;
-		mprec = 53;
-		m = 17;
-		n = 27;
-		k2 = -1021;
-		format = format53;
-		fformat = fformat53;
-		mnrflag = 2;
-		etrflag = 2;
-		printf( "Testing DOUBLE precision.\n" );
-		break;
-#endif
-	case 2:
-#if LDOUBLE
-		SPREC = 20;
-		mprec = 64;
-		m = 20;
-		n = 34;
-		k2 = -16382;
-		format = format64;
-		fformat = fformat64;
-		mnrflag = 3;
-		etrflag = 3;
-		printf( "Testing LONG DOUBLE precision.\n" );
-		break;
-#else
-		goto nodenorm;
-#endif
-	}
-
-	asctoe( Ten, eten );
-/* 10^m - 1 */
-	d2 = m;
-	e53toe( &d2, e1 );
-	epow( eten, e1, maxm );
-	esub( eone, maxm, maxm );
-
-/* test 1 */
-	printf( "1. Checking 10^n - 1 for n = %d to %d.\n", -m, m );
-	emov( eone, q5 );
-	for( count=0; count<=m; count++ )
-		{
-		esub( eone, q5, fullp );
-		chkit( 1 );
-		ediv( q5, eone, q2 );
-		esub( eone, q2, fullp );
-		chkit( 1 );
-		emul( eten, q5, q5 );
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto end1;
-			}
-		}
-end1:
-	printerr();
-
-
-/* test 2 */
-	printf( "2. Checking powers of 10 from 10^-%d to 10^%d.\n", n, n );
-	emov( eone, q5 );
-	for( count=0; count<=n; count++ )
-		{
-		emov( q5, fullp );
-		chkit( 2 );
-		ediv( q5, eone, fullp );
-		chkit( 2 );
-		emul( eten, q5, q5 );
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto end2;
-			}
-		}
-end2:
-	printerr();
-
-/* test 3 */
-	printf( "3. Checking (10^%d-1)*10^n from n = -%d to %d.\n", m, n, n );
-	emov( eone, q5 );
-	for( count= -n; count<=n; count++ )
-		{
-		emul( maxm, q5, fullp );
-		chkit( 3 );
-		emov( q5, fullp );
-		ediv( fullp, eone, fullp );
-		emul( maxm, fullp, fullp );
-		chkit( 3 );
-		emul( eten, q5, q5 );
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto end3;
-			}
-		}
-end3:
-	printerr();
-
-
-
-/* test 4 */
-	printf( "4. Checking powers of 2 from 2^-24 to 2^+56.\n" );
-	d1 = -24.0;
-	e53toe( &d1, q1 );
-	epow( etwo, q1, q5 );
-
-	for( count = -24; count <= 56; count++ )
-		{
-		emov( q5, fullp );
-		chkit( 4 );
-		emul( etwo, q5, q5 );
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto end4;
-			}
-		}
-end4:
-	printerr();
-
-
-/* test 5 */
-	printf( "5. Checking 2^n - 1 for n = 0 to %d.\n", mprec );
-	emov( eone, q5 );
-	for( count=0; count<=mprec; count++ )
-		{
-		esub( eone, q5, fullp );
-		chkit( 5 );
-		emul( etwo, q5, q5 );
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto end5;
-			}
-		}
-end5:
-	printerr();
-
-/* test 6 */
-	printf( "6. Checking 2^n + 1 for n = 0 to %d.\n", mprec );
-	emov( eone, q5 );
-	for( count=0; count<=mprec; count++ )
-		{
-		eadd( eone, q5, fullp );
-		chkit( 6 );
-		emul( etwo, q5, q5 );
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto end6;
-			}
-		}
-end6:
-	printerr();
-
-/* test 7 */
-	printf(
-	 "7. Checking %d values M * 10^N with random integer M and N,\n",
-	 NRAND );
-	printf("  1 <= M <= 10^%d - 1  and  -%d <= N <= +%d.\n", m, n, n );
-	for( i=0; i<NRAND; i++ )
-		{
-		mnrand( fullp );
-		chkit( 7 );
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto end7;
-			}
-		}
-end7:
-	printerr();
-
-/* test 8 */
-	printf("8. Checking critical rounding cases.\n" );
-	for( i=0; i<20; i++ )
-		{
-		mnrand( fullp );
-		eabs( fullp );
-		if( ecmp( fullp, eone ) < 0 )
-			ediv( fullp, eone, fullp );
-		efloor( fullp, fullp );
-		eadd( ehalf, fullp, fullp );
-		chkit( 8 );
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto end8;
-			}
-		}
-end8:
-	printerr();
-
-
-
-/* test 9 */
-	printf("9. Testing on %d random non-denormal values.\n", NRAND );
-	for( i=0; i<NRAND; i++ )
-		{
-		etrand( fullp );
-		chkit( 9 );
-		}
-	printerr();
-	shownoncrit();
-
-/* test 10 */
-	printf(
-	"Do you want to check denormal numbers in this precision ? (y/n) " );
-	gets( str0 );
-	if( str0[0] != 'y' )
-		goto nodenorm;
-
-	printf( "10. Checking denormal numbers.\n" );
-
-/* Form 2^-starting power */
-	d1 = k2;
-	e53toe( &d1, q1 );
-	epow( etwo, q1, e1 );
-
-/* Find 2^-mprec less than starting power */
-	d1 = -mprec + 4;
-	e53toe( &d1, q1 );
-	epow( etwo, q1, e3 );
-	emul( e1, e3, e3 );
-	emov( e3, e2 );
-	ediv( etwo, e2, e2 );
-
-	while( ecmp(e1,e2) != 0 )
-		{
-		eadd( e1, e2, fullp );
-		switch( mprec )
-			{
-#if LDOUBLE
-			case 64:
-			etoe64( e1, &sprec64 );
-			e64toe( &sprec64, q1 );
-			etoe64( fullp, &prec64 );
-			e64toe( &prec64, q2 );
-			break;
-#endif
-#ifdef DEC
-			case 56:
-#endif
-			case 53:
-			etoe53( e1, &sprec53 );
-			e53toe( &sprec53, q1 );
-			etoe53( fullp, &prec53 );
-			e53toe( &prec53, q2 );
-			break;
-
-			case 24:
-			etoe24( e1, &sprec24 );
-			e24toe( &sprec24, q1 );
-			etoe24( fullp, &prec24 );
-			e24toe( &prec24, q2 );
-			break;
-			}
-		if( ecmp( q2, ezero ) == 0 )
-			goto maxden;
-		chkit(10);
-		if( ecmp(q1,q2) == 0 )
-			{
-			ediv( etwo, e1, e1 );
-			emov( e3, e2 );
-			}
-		if( errtot >= MAXERR )
-			{
-			printf( "%s", toomany );
-			goto maxden;
-			}
-		ediv( etwo, e2, e2 );
-		}
-maxden:
-	printerr();
-nodenorm:
-	printf( "\n" );
-	} /* loop on precision */
-printf( "End of test.\n" );
-}
-
-#if CHKINTERNAL
-long double xprec64;
-double xprec53;
-float xprec24;
-
-/* Check binary -> printf -> scanf -> binary identity
- * of internal routines
- */
-void chkinternal( ref, tst, string )
-unsigned short ref[], tst[];
-char *string;
-{
-
-if( ecmp(ref,tst) != 0 )
-	{
-	printf( "internal identity compare error!\n" );
-	chkid( ref, tst, string );
-	}
-}
-#endif
-
-
-/* Check binary -> printf -> scanf -> binary identity
- */
-void chkid( print, scan, string )
-unsigned short print[], scan[];
-char *string;
-{
-/* Test printf-scanf identity */
-if( ecmp( print, scan ) != 0 )
-	{
-	pvec( print, NE );
-	printf( " ->printf-> %s ->scanf->\n", string );
-	pvec( scan, NE );
-	printf( " is not an identity.\n" );
-	++identerr;
-	}
-}
-
-
-/* Check scanf result
- */
-void chkscan( ref, tst, string )
-unsigned short ref[], tst[];
-char *string;
-{
-/* Test scanf()  */
-if( ecmp( ref, tst ) != 0 )
-	{
-	printf( "scanf(%s) -> ", string );
-	pvec( tst, NE );
-	printf( "\n should be    " );
-	pvec( ref, NE );
-	printf( ".\n" );
-	++errscan;
-	++errtot;
-	}
-}
-
-
-/* Test printf() result
- */
-void chkprint( ref, tst, string ) 
-unsigned short ref[], tst[];
-char *string;
-{
-if( ecmp(ref, tst) != 0 )
-	{
-	printf( "printf( ");
-	pvec( ref, NE );
-	printf( ") -> %s\n", string );
-	printf( "      = " );
-	pvec( tst, NE );
-	printf( ".\n" );
-	++errprint;
-	++errtot;
-	}
-}
-
-
-/* Print array of n 16-bit shorts
- */
-void pvec( x, n )
-unsigned short x[];
-int n;
-{
-int i;
-
-for( i=0; i<n; i++ )
-	{
-	printf( "%04x ", x[i] );
-	}
-}
-
-/* Measure worst case printf rounding error
- */
-void cmpprint( ref, tst )
-unsigned short ref[], tst[];
-{
-unsigned short e[NE];
-
-if( ecmp( ref, ezero ) != 0 )
-	{
-	esub( ref, tst, e );
-	ediv( ref, e, e );
-	eabs( e );
-	if( ecmp( e, rprint ) > 0 )
-		emov( e, rprint );
-	}
-}
-
-/* Measure worst case scanf rounding error
- */
-void cmpscan( ref, tst )
-unsigned short ref[], tst[];
-{
-unsigned short er[NE];
-
-if( ecmp( ref, ezero ) != 0 )
-	{
-	esub( ref, tst, er );
-	ediv( ref, er, er );
-	eabs( er );
-	if( ecmp( er, rscan ) > 0 )
-		emov( er, rscan );
-	if( ecmp( er, ehalf ) > 0 )
-		{
-		etoasc( tst, str1, 21 );
-		printf( "Bad error: scanf(%s) = %s !\n", str0, str1 );
-		}
-	}
-}
-
-/* Check rounded-down decimal string output of printf
- */
-void cmptrunc( ref, tst )
-unsigned short ref[], tst[];
-{
-if( ecmp( ref, tst ) != 0 )
-	{
-	printf( "printf(%s%s%s, %s) -> %s\n", quo, tformat, quo, str1, str2 );
-	printf( "should be      %s .\n", str3 );
-	errprint += 1;
-	}
-}
-
-
-void shownoncrit()
-{
-
-etoasc( rprint, str0, 3 );
-printf( "Maximum relative printf error found = %s .\n", str0 );
-etoasc( rscan, str0, 3 );
-printf( "Maximum relative scanf error found = %s .\n", str0 );
-}
-
-
-
-/* Produce arguments and call comparison subroutines.
- */
-void chkit( testno )
-int testno;
-{
-unsigned short t[NE], u[NE], v[NE];
-int j;
-
-switch( mprec )
-	{
-#if LDOUBLE
-	case 64:
-		etoe64( fullp, &prec64 );
-		e64toe( &prec64, rounded );
-#if CHKINTERNAL
-		e64toasc( &prec64, str1, SPREC );
-		asctoe64( str1, &xprec64 );
-		e64toe( &xprec64, t );
-		chkinternal( rounded, t, str1 );
-#endif
-/* check printf and scanf */
-		sprintf( str2, format, prec64 );
-		sscanf( str2, fformat, &sprec64 );
-		e64toe( &sprec64, u );
-		chkid( rounded, u, str2 );
-		asctoe64( str2, &ssprec64 );
-		e64toe( &ssprec64, v );
-		chkscan( v, u, str2 );
-		chkprint( rounded, v, str2 );
-		if( testno < 8 )
-			break;
-/* rounding error measurement */
-		etoasc( fullp, str0, 24 );
-		etoe64( fullp, &ssprec64 );
-		e64toe( &ssprec64, u );
-		sprintf( str2, format, ssprec64 );
-		asctoe( str2, t );
-		cmpprint( u, t );
-		sscanf( str0, fformat, &sprec64 );
-		e64toe( &sprec64, t );
-		cmpscan( fullp, t );
-		if( testno < 8 )
-			break;
-/* strings rounded to less than maximum precision */
-		e64toasc( &ssprec64, str1, 24 );
-		for( j=SPREC-1; j>0; j-- )		
-			{
-			e64toasc( &ssprec64, str3, j );
-			asctoe( str3, v );
-			sprintf( tformat, "%s.%dLe", pct, j );
-			sprintf( str2, tformat, ssprec64 );
-			asctoe( str2, t );
-			cmptrunc( v, t );
-			}
-		break;
-#endif
-#ifdef DEC
-	case 56:
-#endif
-	case 53:
-		etoe53( fullp, &prec53 );
-		e53toe( &prec53, rounded );
-#if CHKINTERNAL
-		e53toasc( &prec53, str1, SPREC );
-		asctoe53( str1, &xprec53 );
-		e53toe( &xprec53, t );
-		chkinternal( rounded, t, str1 );
-#endif
-		sprintf( str2, format, prec53 );
-		sscanf( str2, fformat, &sprec53 );
-		e53toe( &sprec53, u );
-		chkid( rounded, u, str2 );
-		asctoe53( str2, &ssprec53 );
-		e53toe( &ssprec53, v );
-		chkscan( v, u, str2 );
-		chkprint( rounded, v, str2 );
-		if( testno < 8 )
-			break;
-/* rounding error measurement */
-		etoasc( fullp, str0, 24 );
-		etoe53( fullp, &ssprec53 );
-		e53toe( &ssprec53, u );
-		sprintf( str2, format, ssprec53 );
-		asctoe( str2, t );
-		cmpprint( u, t );
-		sscanf( str0, fformat, &sprec53 );
-		e53toe( &sprec53, t );
-		cmpscan( fullp, t );
-		if( testno < 8 )
-			break;
-		e53toasc( &ssprec53, str1, 24 );
-		for( j=SPREC-1; j>0; j-- )		
-			{
-			e53toasc( &ssprec53, str3, j );
-			asctoe( str3, v );
-			sprintf( tformat, "%s.%de", pct, j );
-			sprintf( str2, tformat, ssprec53 );
-			asctoe( str2, t );
-			cmptrunc( v, t );
-			}
-		break;
-
-	case 24:
-		etoe24( fullp, &prec24 );
-		e24toe( &prec24, rounded );
-#if CHKINTERNAL
-		e24toasc( &prec24, str1, SPREC );
-		asctoe24( str1, &xprec24 );
-		e24toe( &xprec24, t );
-		chkinternal( rounded, t, str1 );
-#endif
-		sprintf( str2, format, prec24 );
-		sscanf( str2, fformat, &sprec24 );
-		e24toe( &sprec24, u );
-		chkid( rounded, u, str2 );
-		asctoe24( str2, &ssprec24 );
-		e24toe( &ssprec24, v );
-		chkscan( v, u, str2 );
-		chkprint( rounded, v, str2 );
-		if( testno < 8 )
-			break;
-/* rounding error measurement */
-		etoasc( fullp, str0, 24 );
-		etoe24( fullp, &ssprec24 );
-		e24toe( &ssprec24, u );
-		sprintf( str2, format, ssprec24 );
-		asctoe( str2, t );
-		cmpprint( u, t );
-		sscanf( str0, fformat, &sprec24 );
-		e24toe( &sprec24, t );
-		cmpscan( fullp, t );
-/*
-		if( testno < 8 )
-			break;
-*/
-		e24toasc( &ssprec24, str1, 24 );
-		for( j=SPREC-1; j>0; j-- )		
-			{
-			e24toasc( &ssprec24, str3, j );
-			asctoe( str3, v );
-			sprintf( tformat, "%s.%de", pct, j );
-			sprintf( str2, tformat, ssprec24 );
-			asctoe( str2, t );
-			cmptrunc( v, t );
-			}
-		break;
-	}
-}
-
-
-void printerr()
-{
-if( (errscan == 0) && (identerr == 0) && (errprint == 0) )
-	printf( "No errors found.\n" );
-else
-	{
-	printf( "%d binary -> decimal errors found.\n", errprint );
-	printf( "%d decimal -> binary errors found.\n", errscan );
-	}
-errscan = 0;	/* reset for next test */
-identerr = 0;
-errprint = 0;
-errtot = 0;
-}
-
-
-/* Random number generator
- * in the range M * 10^N, where 1 <= M <= 10^17 - 1
- * and -27 <= N <= +27.  Test values of M are logarithmically distributed
- * random integers; test values of N are uniformly distributed random integers.
- */
-
-static char *fwidth = "1.036163291797320557783096e1"; /* log(sqrt(10^9-1)) */
-static char *dwidth = "1.957197329044938830915E1"; /* log(sqrt(10^17-1)) */
-static char *ldwidth = "2.302585092994045684017491e1"; /* log(sqrt(10^20-1)) */
-
-static char *a13 = "13.0";
-static char *a27 = "27.0";
-static char *a34 = "34.0";
-static char *a10m13 = "1.0e-13";
-static unsigned short LOW[ NE ], WIDTH[NE], e27[NE], e10m13[NE];
-
-
-void mnrand( erand )
-unsigned short erand[];
-{
-unsigned short ea[NE], em[NE], en[NE], ex[NE];
-double x, a;
-
-if( mnrflag )
-	{
-	if( mnrflag == 3 )
-		{
-		asctoe( ldwidth, WIDTH );
-		asctoe( a34, e27 );
-		}
-	if( mnrflag == 2 )
-		{
-		asctoe( dwidth, WIDTH );
-		asctoe( a27, e27 );
-		}
-	if( mnrflag == 1 )
-		{
-		asctoe( fwidth, WIDTH );
-		asctoe( a13, e27 );
-		}
-	asctoe( a10m13, e10m13 );
-	mnrflag = 0;
-	}
-drand( &x );
-e53toe( &x, ex ); /* x = WIDTH *  ( x - 1.0 )  +  LOW; */
-esub( eone, ex, ex );
-emul( WIDTH, ex, ex );
-eexp( ex, ex );   /* x = exp(x); */
-
-drand( &a );
-e53toe( &a, ea );
-emul( ea, ex, ea );  /* a = 1.0e-13 * x * a; */
-emul( e10m13, ea, ea );
-eabs( ea );
-eadd( ea, ex, ex );	/* add fuzz */
-emul( ex, ex, ex );	/* square it, to get range to 10^17 - 1 */
-efloor( ex, em ); /* this is M */
-
-/* Random power of 10 */
-drand( &a );
-e53toe( &a, ex );
-esub( eone, ex, ex ); /* y3 = 54.0 *  ( y3 - 1.0 ) + 0.5; */
-emul( e27, ex, ex );
-eadd( ex, ex, ex );
-eadd( ehalf, ex, ex );
-efloor( ex, ex ); /* y3 = floor( y3 ) - 27.0; */
-esub( e27, ex, en ); /* this is N */
-epow( eten, en, ex );
-emul( ex, em, erand );
-}
-
-/* -ln 2^16382 */
-char *ldemin = "-1.1355137111933024058873097E4";
-char *ldewid =  "2.2710274223866048117746193E4";
-/* -ln 2^1022 */
-char *demin  = "-7.0839641853226410622441123E2";
-char *dewid  =  "1.4167928370645282124488225E3";
-/* -ln 2^125 */
-char *femin  = "-8.6643397569993163677154015E1";
-char *fewid  =  "1.7328679513998632735430803E2";
-
-void etrand( erand )
-unsigned short erand[];
-{
-unsigned short ea[NE], ex[NE];
-double x, a;
-
-if( etrflag )
-	{
-	if( etrflag == 3 )
-		{
-		asctoe( ldemin, LOW );
-		asctoe( ldewid, WIDTH );
-		asctoe( a34, e27 );
-		}
-	if( etrflag == 2 )
-		{
-		asctoe( demin, LOW );
-		asctoe( dewid, WIDTH );
-		asctoe( a27, e27 );
-		}
-	if( etrflag == 1 )
-		{
-		asctoe( femin, LOW );
-		asctoe( fewid, WIDTH );
-		asctoe( a13, e27 );
-		}
-	asctoe( a10m13, e10m13 );
-	etrflag = 0;
-	}
-drand( &x );
-e53toe( &x, ex ); /* x = WIDTH *  ( x - 1.0 )  +  LOW; */
-esub( eone, ex, ex );
-emul( WIDTH, ex, ex );
-eadd( LOW, ex, ex );
-eexp( ex, ex );   /* x = exp(x); */
-
-/* add fuzz
- */
-drand( &a );
-e53toe( &a, ea );
-emul( ea, ex, ea );  /* a = 1.0e-13 * x * a; */
-emul( e10m13, ea, ea );
-if( ecmp( ex, ezero ) > 0 )
-	eneg( ea );
-eadd( ea, ex, erand );
-}
-