mirage_crypto.h, entropy_cpu_stubs.c: add powerpc macros (#269)

* mirage_crypto.h: add powerpc macros

* entropy_cpu_stubs.c: fix powerpc

Author: barracuda156

src/native/entropy_cpu_stubs.c

@@ -126,7 +126,7 @@ static inline uint64_t read_virtual_count(void)
 }
 #endif /* aarch64 */
 
-#if defined (__powerpc64__)
+#if defined (__powerpc64__) || defined(__POWERPC__)
 /* from clang's builtin version and gperftools at
 https://chromium.googlesource.com/external/gperftools/+/master/src/base/cycleclock.h
 */
@@ -183,7 +183,7 @@ CAMLprim value mc_cycle_counter (value __unused(unit)) {
   return Val_long (__rdtsc ());
 #elif defined (__arm__) || defined (__aarch64__)
   return Val_long (read_virtual_count ());
-#elif defined(__powerpc64__)
+#elif defined(__powerpc64__) || defined(__POWERPC__)
   return Val_long (read_cycle_counter ());
 #elif defined(__riscv) && (64 == __riscv_xlen)
   return Val_long (cycle_count ());

src/native/mirage_crypto.h

@@ -50,9 +50,9 @@ extern struct _mc_cpu_features mc_detected_cpu_features;
 
 #endif /* __mc_ACCELERATE__ */
 
-#if defined (__x86_64__) || defined (__aarch64__) || defined (__powerpc64__) || (64 == __riscv_xlen) || defined (__s390x__) || (defined (__mips__) && _MIPS_SIM==_ABI64) || defined (__loongarch_lp64) || (1 == _WIN64)
+#if defined (__x86_64__) || defined (__aarch64__) || defined (__powerpc64__) || defined (__ppc64__) || (64 == __riscv_xlen) || defined (__s390x__) || (defined (__mips__) && _MIPS_SIM==_ABI64) || defined (__loongarch_lp64) || (1 == _WIN64)
 #define ARCH_64BIT
-#elif defined (__i386__) || defined (__arm__) || (32 == __riscv_xlen) || (defined (__mips__) && _MIPS_SIM==_ABIO32) || (1 == _WIN32)
+#elif defined (__i386__) || defined (__arm__) || (32 == __riscv_xlen) || (defined (__mips__) && _MIPS_SIM==_ABIO32) || defined (__ppc__) || (1 == _WIN32)
 #define ARCH_32BIT
 #else
 #error "unsupported platform"