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checkasm: Add a readtime impl for ppc

--- a/tests/checkasm/checkasm.c

+++ b/tests/checkasm/checkasm.c

@@ -100,6 +100,8 @@

     { "AVX-512", "avx512", DAV1D_X86_CPU_FLAG_AVX512 },

 #elif ARCH_AARCH64 || ARCH_ARM

     { "NEON",    "neon",   DAV1D_ARM_CPU_FLAG_NEON },

+#elif ARCH_PPC64LE

+    { "VSX",     "vsx",    DAV1D_PPC_CPU_FLAG_VSX },

 #endif

     { 0 }

 };

--- a/tests/checkasm/checkasm.h

+++ b/tests/checkasm/checkasm.h

@@ -155,6 +155,24 @@

     return cycle_counter;

 }

 #define readtime readtime

+#elif ARCH_PPC64LE

+static inline uint64_t readtime(void) {

+    uint32_t tbu, tbl, temp;

+

+    __asm__ __volatile__(

+        "1:\n"

+        "mfspr %2,269\n"

+        "mfspr %0,268\n"

+        "mfspr %1,269\n"

+        "cmpw   %2,%1\n"

+        "bne    1b\n"

+    : "=r"(tbl), "=r"(tbu), "=r"(temp)

+    :

+    : "cc");

+

+    return (((uint64_t)tbu) << 32) | (uint64_t)tbl;

+}

+#define readtime readtime

 #endif

 /* Verifies that clobbered callee-saved registers