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ppc --with-tsc fixes

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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
parent 4763ff864f
commit ceb359a69b
2 changed files with 70 additions and 2 deletions
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58
python-2.7.2-tsc-on-ppc.patch Normal file
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@ -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__)

14
python3.spec
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@ -118,7 +118,7 @@
Summary: Version 3 of the Python programming language aka Python 3000
Name: python3
Version: %{pybasever}.1
Release: 4%{?dist}
Release: 5%{?dist}
License: Python
Group: Development/Languages
@ -266,6 +266,11 @@ Patch128: python-3.2b2-test_sys-COUNT_ALLOCS.patch
# Not yet sent upstream
Patch129: python-3.2.1-fix-test-subprocess-with-nonreadable-path-dir.patch
# Fix the --with-tsc option on ppc64, and rework it on 32-bit ppc to avoid
# aliasing violations (rhbz#698726)
# Not yet sent upstream
Patch130: python-2.7.2-tsc-on-ppc.patch
# This is the generated patch to "configure"; see the description of
# %{regenerate_autotooling_patch}
# above:
@ -424,6 +429,7 @@ rm -r Modules/zlib || exit 1
%patch127 -p1
%patch128 -p1
%patch129 -p1
%patch130 -p1 -b .tsc-on-ppc
# Currently (2010-01-15), http://docs.python.org/library is for 2.6, and there
# are many differences between 2.6 and the Python 3 library.
@ -536,7 +542,7 @@ BuildPython() {
BuildPython debug \
python-debug \
python%{pybasever}-debug \
%ifarch %{ix86} x86_64 ppc
%ifarch %{ix86} x86_64 ppc ppc64
"--with-pydebug --with-tsc --with-count-allocs --with-call-profile" \
%else
"--with-pydebug --with-count-allocs --with-call-profile" \
@ -1290,6 +1296,10 @@ rm -fr %{buildroot}
# ======================================================
%changelog
* Tue Aug 23 2011 David Malcolm <dmalcolm@redhat.com> - 3.2.1-5
- re-enable and fix the --with-tsc option on ppc64, and rework it on 32-bit
ppc to avoid aliasing violations (patch 130; rhbz#698726)
* Tue Aug 23 2011 David Malcolm <dmalcolm@redhat.com> - 3.2.1-4
- don't use --with-tsc on ppc64 debug builds (rhbz#698726)