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c-cppbuiltin.c (builtin_define_float_constants): Set __*_EPSILON__ for IBM long double format correctly.

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* c-cppbuiltin.c (builtin_define_float_constants): Set __*_EPSILON__
	for IBM long double format correctly.

From-SVN: r93021
This commit is contained in:
Geoffrey Keating 2005-01-07 00:19:23 +00:00 • committed by Geoffrey Keating
parent 44d0e0415d
commit 59d7d76786
4 changed files with 37 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-01-06 Geoffrey Keating <geoffk@apple.com>
* c-cppbuiltin.c (builtin_define_float_constants): Set __*_EPSILON__
for IBM long double format correctly.
2005-01-06 Daniel Berlin <dberlin@dberlin.org>
Fix PR tree-optimization/18792

7
gcc/c-cppbuiltin.c
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@ -219,7 +219,12 @@ builtin_define_float_constants (const char *name_prefix, const char *fp_suffix,
/* The difference between 1 and the least value greater than 1 that is
representable in the given floating point type, b**(1-p). */
sprintf (name, "__%s_EPSILON__", name_prefix);
sprintf (buf, "0x1p%d", (1 - fmt->p) * fmt->log2_b);
if (fmt->pnan < fmt->p)
/* This is an IBM extended double format, so 1.0 + any double is
representable precisely. */
sprintf (buf, "0x1p%d", (fmt->emin - fmt->p) * fmt->log2_b);
else
sprintf (buf, "0x1p%d", (1 - fmt->p) * fmt->log2_b);
builtin_define_with_hex_fp_value (name, type, decimal_dig, buf, fp_suffix);
/* For C++ std::numeric_limits<T>::denorm_min. The minimum denormalized

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2005-01-06 Geoffrey Keating <geoffk@apple.com>
* gcc.dg/rs6000-ldouble-2.c: New.
2005-01-06 Mark Mitchell <mark@codesourcery.com>
PR c++/19244

22
gcc/testsuite/gcc.dg/rs6000-ldouble-2.c Normal file
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@ -0,0 +1,22 @@
/* { dg-do run { target powerpc*-*-darwin* powerpc*-*-aix* powerpc64-*-linux rs6000-*-* } } */
/* { dg-options "-mlong-double-128" } */
/* Check that LDBL_EPSILON is right for 'long double'. */
#include <float.h>
extern void abort (void);
int main(void)
{
volatile long double ee = 1.0;
long double eps = ee;
while (ee + 1.0 != 1.0)
{
eps = ee;
ee = eps / 2;
}
if (eps != LDBL_EPSILON)
abort ();
return 0;
}