commit 558ab896cbdd90259950c631ba29a1c66bf4c2d3
Author: q66 <daniel@octaforge.org>
Date:   Mon Feb 28 23:53:22 2022 +0100

    add some hwcap bits fallbacks

diff --git a/deps/v8/src/base/cpu.cc b/deps/v8/src/base/cpu.cc
index a1b21d2..8e52802 100644
--- a/deps/v8/src/base/cpu.cc
+++ b/deps/v8/src/base/cpu.cc
@@ -768,6 +768,13 @@ CPU::CPU()
 
 #elif V8_HOST_ARCH_PPC || V8_HOST_ARCH_PPC64
 
+#ifndef PPC_FEATURE2_HAS_ISEL
+#define PPC_FEATURE2_HAS_ISEL 0x08000000
+#endif
+#ifndef PPC_FEATURE2_ARCH_3_1
+#define PPC_FEATURE2_ARCH_3_1 0x00040000
+#endif
+
 #ifndef USE_SIMULATOR
 #if V8_OS_LINUX
   // Read processor info from getauxval() (needs at least glibc 2.18 or musl).