From c40428716c90be361a28cfc4f077a31f4501a93c Mon Sep 17 00:00:00 2001
From: Piotr Kubaj <pkubaj@FreeBSD.org>
Date: Wed, 1 Jul 2026 08:13:14 +0000
Subject: [PATCH] cycles.c: add powerpc64* support

Currently build fails on FreeBSD/powerpc64{le,} without that.
---
 criterion-measurement/cbits/cycles.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/criterion-measurement/cbits/cycles.c b/criterion-measurement/cbits/cycles.c
index 2cdee78..b6b059d 100644
--- a/criterion-measurement/cbits/cycles.c
+++ b/criterion-measurement/cbits/cycles.c
@@ -18,6 +18,19 @@ StgWord64 criterion_rdtsc(void)
   return ret;
 }
 
+#elif powerpc64le_HOST_ARCH || powerpc64_HOST_ARCH
+
+StgWord64 criterion_rdtsc(void)
+{
+  // Read the PowerPC Time Base: a monotonically-increasing 64-bit counter
+  // that is the architectural analogue of x86's TSC. SPR 268 returns the
+  // full 64-bit Time Base on 64-bit PowerPC (this is what the deprecated
+  // `mftb` mnemonic expanded to).
+  StgWord64 ret;
+  __asm__ __volatile__ ("mfspr %0, 268" : "=r"(ret));
+  return ret;
+}
+
 #elif x86_64_HOST_ARCH || i386_HOST_ARCH
 
 StgWord64 criterion_rdtsc(void)