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performance boost (on P4 hosts at least, rdtsc is a _very_ bad random generator)

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1892 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2006-05-02 22:18:28 +00:00
parent e553272d75
commit f5d2a381d1
1 changed files with 6 additions and 3 deletions
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9
hw/mips_r4k.c
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@ -27,11 +27,14 @@ void cpu_mips_irqctrl_init (void)
{
}
/* XXX: do not use a global */
uint32_t cpu_mips_get_random (CPUState *env)
{
uint32_t now = qemu_get_clock(vm_clock);
return now % (MIPS_TLB_NB - env->CP0_Wired) + env->CP0_Wired;
static uint32_t seed = 0;
uint32_t idx;
seed = seed * 314159 + 1;
idx = (seed >> 16) % (MIPS_TLB_NB - env->CP0_Wired) + env->CP0_Wired;
return idx;
}
/* MIPS R4K timer */