1 files changed, 47 insertions, 0 deletions
diff --git a/science/py-tensorflow/files/extra-patch-absl_base_internal_unscaledcycleclock.cc b/science/py-tensorflow/files/extra-patch-absl_base_internal_unscaledcycleclock.cc
new file mode 100644
index 000000000000..43bbada5c4bb
--- /dev/null
+++ b/science/py-tensorflow/files/extra-patch-absl_base_internal_unscaledcycleclock.cc
@@ -0,0 +1,47 @@
+--- a/absl/base/internal/unscaledcycleclock.cc.orig	2021-10-11 21:53:31.946215000 +0200
++++ b/absl/base/internal/unscaledcycleclock.cc	2021-10-11 21:57:54.536557000 +0200
+@@ -21,8 +21,15 @@
+ #endif
+ 
+ #if defined(__powerpc__) || defined(__ppc__)
++#ifdef __linux__
+ #include <sys/platform/ppc.h>
++#else
++#include "absl/base/call_once.h"
++#include <sys/types.h>
++#include <sys/sysctl.h>
++#include <threads.h>
+ #endif
++#endif
+ 
+ #include "absl/base/internal/sysinfo.h"
+ 
+@@ -56,11 +63,28 @@
+ #elif defined(__powerpc__) || defined(__ppc__)
+ 
+ int64_t UnscaledCycleClock::Now() {
++#ifdef __linux__
+   return __ppc_get_timebase();
++#else
++  int64_t tbr;
++  asm volatile("mfspr %0, 268" : "=r"(tbr));
++  return tbr;
++#endif
+ }
+ 
+ double UnscaledCycleClock::Frequency() {
++#ifdef __linux__
+   return __ppc_get_timebase_freq();
++#else
++  static once_flag init_timebase_frequency_once;
++  static double timebase_frequency = 0.0;
++  base_internal::LowLevelCallOnce(&init_timebase_frequency_once, [&]() {
++    size_t length = sizeof(timebase_frequency);
++    sysctlbyname("kern.timecounter.tc.timebase.frequency", &timebase_frequency,
++                 &length, nullptr, 0);
++  });
++  return timebase_frequency;
++#endif
+ }
+ 
+ #elif defined(__aarch64__)