pow() function problem with SH target

["Shrinivas Atre" <ShrinivasA at kpit dot com>]

Hi,
On SH tool chain it is observed that the pow() function does not give correct results for some conditions.
e.g.
a = pow(x,y); /* x raised to y */
When y = 4.0, 6.0 or exact multiple of 2.0 then pow function does not give correct result. However even if y is 0.0000001 less or more it gives correct result.

Test program is given at the end of mail.

Any clue , suggestions ?

The function fails only for Hitachi-SH targets whereas it works well with H8300 targets.

I am using newlib 1.10.0.

Thanks in advance.
Regards
Shrinivas

Here is the test program.

====================================== pow.c BEGIN  ==========================================
#include <stdio.h>
#include <math.h>

float f1,f2,f3,f4,f5,fr;

int main(void)
{
  f1 = 5.0;
  f2 = 4.0;
  f3 = 6.0;
  f4 = 7.0;
  f5 = 4.00000000001;
  fr = pow(f1,f1); /* ===============> OK */
  printf("%f raised to %f is %f \r\n",f1,f1,fr);
  fr = pow(f1,f2); /* ===============> FAILS */
  printf("%f raised to %f is %f \r\n",f1,f2,fr);
  fr = pow(f1,f3); /* ===============> FAILS */
  printf("%f raised to %f is %f \r\n",f1,f3,fr);
  fr = pow(f1,f4); /* ===============> OK */
  printf("%f raised to %f is %f \r\n",f1,f4,fr);
  fr = pow(f1,f5); /* ===============> THIS IS ALSO OK */
  printf("%f raised to %f is %f \r\n",f1,f5,fr);
  return (int)fr;
}
======================================= pow.c END =========================================

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