rpms/python3.6
3
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ppc --with-tsc fixes

Browse source 
re-enable and fix the --with-tsc option on ppc64, and rework it on
32-bit ppc to avoid aliasing violations (patch 129; rhbz#698726)
This commit is contained in:
David Malcolm 2011-08-23 16:48:59 -04:00
commit ceb359a69b
2 changed files with 70 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

58
python-2.7.2-tsc-on-ppc.patch Normal file
View file

@ -0,0 +1,58 @@
diff -up Python-2.7.2/Python/ceval.c.tsc-on-ppc Python-2.7.2/Python/ceval.c
--- Python-2.7.2/Python/ceval.c.tsc-on-ppc 2011-08-23 14:59:48.051300849 -0400
+++ Python-2.7.2/Python/ceval.c 2011-08-23 15:33:25.412162902 -0400
@@ -37,24 +37,42 @@ typedef unsigned long long uint64;
*/
#if defined(__ppc__) || defined (__powerpc__)
-#define READ_TIMESTAMP(var) ppc_getcounter(&var)
+#if defined( __powerpc64__) || defined(__LP64__)
+/* 64-bit PowerPC */
+#define READ_TIMESTAMP(var) ppc64_getcounter(&var)
+static void
+ppc64_getcounter(uint64 *v)
+{
+ /* On 64-bit PowerPC we can read the 64-bit timebase directly into a
+ 64-bit register */
+ uint64 timebase;
+#ifdef _ARCH_PWR4
+ asm volatile ("mfspr %0,268" : "=r" (timebase));
+#else
+ asm volatile ("mftb %0" : "=r" (timebase));
+#endif
+ *v = timebase;
+}
+
+#else
+/* 32-bit PowerPC */
+#define READ_TIMESTAMP(var) ppc32_getcounter(&var)
static void
-ppc_getcounter(uint64 *v)
+ppc32_getcounter(uint64 *v)
{
- register unsigned long tbu, tb, tbu2;
+ union { long long ll; long ii[2]; } u;
+ long tmp;
loop:
- asm volatile ("mftbu %0" : "=r" (tbu) );
- asm volatile ("mftb %0" : "=r" (tb) );
- asm volatile ("mftbu %0" : "=r" (tbu2));
- if (__builtin_expect(tbu != tbu2, 0)) goto loop;
-
- /* The slightly peculiar way of writing the next lines is
- compiled better by GCC than any other way I tried. */
- ((long*)(v))[0] = tbu;
- ((long*)(v))[1] = tb;
+ asm volatile ("mftbu %0" : "=r" (u.ii[0]) );
+ asm volatile ("mftb %0" : "=r" (u.ii[1]) );
+ asm volatile ("mftbu %0" : "=r" (tmp));
+ if (__builtin_expect(u.ii[0] != tmp, 0)) goto loop;
+
+ *v = u.ll;
}
+#endif /* powerpc 32/64 bit */
#elif defined(__i386__)