diff options
| author | zimmerma <zimmerma@280ebfd0-de03-0410-8827-d642c229c3f4> | 2002-03-26 09:40:06 +0000 |
|---|---|---|
| committer | zimmerma <zimmerma@280ebfd0-de03-0410-8827-d642c229c3f4> | 2002-03-26 09:40:06 +0000 |
| commit | e3f775ca512dc4095a539f08f835095ace60653b (patch) | |
| tree | a91a12997883efaa17df339c5d773c298550bec8 /tests/tget_d.c | |
| parent | 1fc42ba93fd722307796c9aed50c5be3bd95be98 (diff) | |
| download | mpfr-e3f775ca512dc4095a539f08f835095ace60653b.tar.gz | |
fixed problem on x86 (set precision to double to avoid double rounding)
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@1778 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'tests/tget_d.c')
| -rw-r--r-- | tests/tget_d.c | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/tests/tget_d.c b/tests/tget_d.c index d8ef44771..4138c646d 100644 --- a/tests/tget_d.c +++ b/tests/tget_d.c @@ -27,6 +27,23 @@ MA 02111-1307, USA. */ #include "mpfr-impl.h" #include "mpfr-test.h" +#if (defined (__i386__) || defined (__i486__)) +#ifdef __CYGWIN32__ /* no fpu_control.h under Cygnus */ +#define _FPU_EXTENDED 0x300 +#define _FPU_DOUBLE 0x200 +#define _FPU_DEFAULT 0x137f +#define _FPU_RC_NEAREST 0x0 +#define _FPU_RC_DOWN 0x400 +#define _FPU_RC_UP 0x800 +#define _FPU_RC_ZERO 0xC00 +#else +#include <fpu_control.h> +#endif /* ifdef __CYGWIN32__ */ +#ifndef __setfpucw +#define __setfpucw(cw) __asm__ ("fldcw %0" : : "m" (cw)) +#endif /* ifndef __setfpucw */ +#endif /* __i386__ */ + int main (void) { @@ -43,6 +60,11 @@ main (void) mpfr_init2(x, 128); mpfr_init2(y, 128); +#if defined(__i386__) + /* sets the precision to double */ + __setfpucw((_FPU_DEFAULT & (~_FPU_EXTENDED)) | _FPU_DOUBLE); +#endif + for (rnd_mode = 0; rnd_mode <= 3; rnd_mode++) { int i, j, si, sj; @@ -52,8 +74,9 @@ main (void) for (i = 1, di = 0.25; i < 127; i++, di *= 0.5) for (si = 0; si <= 1; si++) { - mpfr_div_2ui(x, half, i, GMP_RNDZ); + mpfr_div_2ui (x, half, i, GMP_RNDZ); (si ? mpfr_sub : mpfr_add)(x, half, x, GMP_RNDZ); + /* x = 1/2 +/- 1/2^(1+i) */ for (j = i+1, dj = di * 0.5; j < 128 && j < i+53; j++, dj *= 0.5) for (sj = 0; sj <= 1; sj++) { @@ -61,10 +84,11 @@ main (void) int exp; char *f; - mpfr_div_2ui(y, half, j, GMP_RNDZ); + mpfr_div_2ui (y, half, j, GMP_RNDZ); (sj ? mpfr_sub : mpfr_add)(y, x, y, GMP_RNDZ); + /* y = 1/2 +/- 1/2^(1+i) +/- 1/2^(1+j) */ exp = (LONG_RAND() % 47) - 23; - mpfr_mul_2si(y, y, exp, GMP_RNDZ); + mpfr_mul_2si (y, y, exp, GMP_RNDZ); if (mpfr_inexflag_p()) { fprintf(stderr, "Error in tget_d: inexact flag for " @@ -76,13 +100,13 @@ main (void) d = si ? 0.5 - dd : 0.5 + dd; if ((LONG_RAND() / 1024) & 1) { - c = mpfr_get_d2(y, rnd_mode); + c = mpfr_get_d2 (y, rnd_mode); f = "mpfr_get_d2"; } else { exp = (LONG_RAND() % 47) - 23; - c = mpfr_get_d3(y, exp, rnd_mode); + c = mpfr_get_d3 (y, exp, rnd_mode); f = "mpfr_get_d3"; if (si) /* then real d < 0.5 */ d *= sj && i == 1 ? 4 : 2; /* normalize real d */ |