///--------------------------------------------------------------------------
/// Quick random generation.
+// Common register allocation.
+#if CPUFAM_X86
+# define COUNT ecx
+#endif
+#if CPUFAM_AMD64 && ABI_SYSV
+# define COUNT ecx
+#endif
+#if CPUFAM_AMD64 && ABI_WIN
+# define COUNT r8d
+#endif
+
FUNC(rand_quick_x86ish_rdrand)
// 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]
- stalloc 28
-# define COUNT ecx
+ push ebx
+ stalloc 24
#endif
#if CPUFAM_AMD64 && ABI_SYSV
stalloc 8
-# define COUNT ecx
#endif
#if CPUFAM_AMD64 && ABI_WIN
stalloc 40
-# define COUNT r8d
#endif
endprologue
// Failed.
mov eax, -1
jmp 9f
+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
// Success.
1:
#if CPUFAM_X86
+ ldgot ebx
mov [SP + 16], AX
lea ecx, [SP + 16]
mov dword ptr [SP + 12], 32
// Done.
9:
#if CPUFAM_X86
- stfree 28
+ stfree 24
+ pop ebx
#endif
#if CPUFAM_AMD64 && ABI_SYSV
stfree 8
ret
ENDFUNC
+#undef COUNT
+
///----- That's all, folks --------------------------------------------------