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PowerPC: Fix for POWER7 sinf/cosf 

This patch fixes some sinf/cosf calculations that generated unexpected
underflows exceptions.
This commit is contained in:
Adhemerval Zanella 2012-06-01 10:10:18 -03:00
parent ebc64a18c0
commit 73a68f94d6
3 changed files with 11 additions and 4 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2012-06-01 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/fpu/k_cosf.c: Fix underflow generation.
* sysdeps/powerpc/fpu/k_sinf.c: Likewise.
2012-05-31 H.J. Lu <hongjiu.lu@intel.com> 2012-05-31 H.J. Lu <hongjiu.lu@intel.com>
[BZ #14117] [BZ #14117]

3
sysdeps/powerpc/fpu/k_cosf.c
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@ -18,6 +18,7 @@
not, see <http://www.gnu.org/licenses/>. */ not, see <http://www.gnu.org/licenses/>. */
#include <math.h> #include <math.h>
#include <fenv.h>
#include <math_private.h> #include <math_private.h>
static const float twom27 = 7.4505806e-09; static const float twom27 = 7.4505806e-09;
@ -40,7 +41,7 @@ __kernel_cosf (float x, float y)
ix = __builtin_fabsf (x); ix = __builtin_fabsf (x);
if (ix < twom27) if (ix < twom27)
{ /* |x| < 2**-27 */ { /* |x| < 2**-27 */
if (x == 0.0) __feraiseexcept (FE_INEXACT);
return one; return one;
} }
z = x * x; z = x * x;

3
sysdeps/powerpc/fpu/k_sinf.c
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@ -18,6 +18,7 @@
not, see <http://www.gnu.org/licenses/>. */ not, see <http://www.gnu.org/licenses/>. */
#include <math.h> #include <math.h>
#include <fenv.h>
#include <math_private.h> #include <math_private.h>
@ -39,7 +40,7 @@ __kernel_sinf (float x, float y, int iy)
ix = __builtin_fabsf (x); ix = __builtin_fabsf (x);
if (ix < twom27) if (ix < twom27)
{ /* |x| < 2**-27 */ { /* |x| < 2**-27 */
if (x == 0.0) __feraiseexcept (FE_INEXACT);
return x; return x;
} }
z = x * x; z = x * x;