+ENDFUNC
+
+FUNC(rand_quick_x86ish_rdseed)
+ // Enter with a pointer to the random context in the first argument.
+ // Return zero on success, or -1 on error.
+
+#if CPUFAM_X86
+ mov edx, [SP + 4]
+ push ebx
+ stalloc 24
+#endif
+#if CPUFAM_AMD64 && ABI_SYSV
+ stalloc 8
+#endif
+#if CPUFAM_AMD64 && ABI_WIN
+ stalloc 40
+#endif
+ endprologue
+
+ // Try to fetch a random number.
+ mov COUNT, 16
+0: rdseed AX
+ jc 1f
+ dec COUNT
+ jnz 0b
+
+ // Failed.
+ mov eax, -1
+ jmp 9f