glibc/glibc-stap-libm.patch

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2012-05-23 18:18:07 +00:00
diff -rup c/sysdeps/ieee754/dbl-64/slowexp.c d/sysdeps/ieee754/dbl-64/slowexp.c
--- c/sysdeps/ieee754/dbl-64/slowexp.c 2013-06-04 16:40:55.000000000 +0530
+++ d/sysdeps/ieee754/dbl-64/slowexp.c 2013-06-04 21:02:49.377439607 +0530
@@ -29,6 +29,8 @@
/**************************************************************************/
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#include <math_private.h>
+#include <stap-probe.h>
+
#ifndef USE_LONG_DOUBLE_FOR_MP
# include "mpa.h"
void __mpexp (mp_no *x, mp_no *y, int p);
@@ -60,13 +62,22 @@ __slowexp (double x)
__mp_dbl (&mpw, &w, p);
__mp_dbl (&mpz, &z, p);
if (w == z)
- return w;
+ {
+ /* Track how often we get to the slow exp code plus
+ its input/output values. */
+ LIBC_PROBE (slowexp_p6, 2, &x, &w);
+ return w;
+ }
else
{
p = 32;
__dbl_mp (x, &mpx, p);
__mpexp (&mpx, &mpy, p);
__mp_dbl (&mpy, &res, p);
+
+ /* Track how often we get to the uber-slow exp code plus
+ its input/output values. */
+ LIBC_PROBE (slowexp_p32, 2, &x, &res);
return res;
}
#else
2012-05-23 18:18:07 +00:00
diff -rup c/sysdeps/ieee754/dbl-64/slowpow.c d/sysdeps/ieee754/dbl-64/slowpow.c
--- c/sysdeps/ieee754/dbl-64/slowpow.c 2013-06-04 16:40:55.000000000 +0530
+++ d/sysdeps/ieee754/dbl-64/slowpow.c 2013-06-04 21:05:21.776433149 +0530
2012-05-23 18:18:07 +00:00
@@ -34,6 +34,8 @@
#include "mpa.h"
2012-05-23 18:18:07 +00:00
#include <math_private.h>
+#include <stap-probe.h>
+
#ifndef SECTION
# define SECTION
#endif
@@ -97,7 +99,12 @@ __slowpow (double x, double y, double z)
__sub (&mpp, &eps, &mpr1, p);
__mp_dbl (&mpr1, &res1, p);
if (res == res1)
- return res;
+ {
+ /* Track how often we get to the slow pow code plus
+ its input/output values. */
+ LIBC_PROBE (slowpow_p10, 4, &x, &y, &z, &res);
+ return res;
+ }
/* If we don't, then we repeat using a higher precision. 768 bits of
precision ought to be enough for anybody. */
@@ -109,5 +116,10 @@ __slowpow (double x, double y, double z)
__mul (&mpy, &mpz, &mpw, p);
__mpexp (&mpw, &mpp, p);
__mp_dbl (&mpp, &res, p);
+
+ /* Track how often we get to the uber-slow pow code plus
+ its input/output values. */
+ LIBC_PROBE (slowpow_p32, 4, &x, &y, &z, &res);
+
return res;
}