From 0437e37299a30ecfea716e15069bfb5cfd3697b5 Mon Sep 17 00:00:00 2001
From: Valentin Churavy <v.churavy@gmail.com>
Date: Wed, 18 Nov 2020 21:34:02 -0500
Subject: [PATCH] implement cycleclock on PPC

---
 src/julia_internal.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/julia_internal.h b/src/julia_internal.h
index 9db9385c9371b..19efe2ad23912 100644
--- a/src/julia_internal.h
+++ b/src/julia_internal.h
@@ -107,6 +107,12 @@ static inline uint64_t cycleclock(void)
     int64_t virtual_timer_value;
     __asm__ volatile("mrs %0, cntvct_el0" : "=r"(virtual_timer_value));
     return virtual_timer_value;
+#elif defined(_CPU_PPC64_)
+    // This returns a time-base, which is not always precisely a cycle-count.
+    // https://reviews.llvm.org/D78084
+    int64_t tb;
+    asm volatile("mfspr %0, 268" : "=r" (tb));
+    return tb;
 #else
     #warning No cycleclock() definition for your platform
     // copy from https://github.com/google/benchmark/blob/v1.5.0/src/cycleclock.h