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// This is free and unencumbered software released into the public domain.
//
// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.
#include "firmware.h"
static uint32_t xorshift32(void) {
static uint32_t x = 314159265;
x ^= x << 13;
x ^= x >> 17;
x ^= x << 5;
return x;
}
void multest(void)
{
for (int i = 0; i < 15; i++)
{
uint32_t a = xorshift32();
uint32_t b = xorshift32();
switch (i)
{
case 0:
a = 0x80000000;
b = 0xFFFFFFFF;
break;
case 1:
a = 0;
b = 0;
break;
case 2:
a |= 0x80000000;
b = 0;
break;
case 3:
a &= 0x7FFFFFFF;
b = 0;
break;
}
uint64_t au = a, bu = b;
int64_t as = (int32_t)a, bs = (int32_t)b;
print_str("input [");
print_hex(as >> 32, 8);
print_str("] ");
print_hex(a, 8);
print_str(" [");
print_hex(bs >> 32, 8);
print_str("] ");
print_hex(b, 8);
print_chr('\n');
uint32_t h_mul, h_mulh, h_mulhsu, h_mulhu;
print_str("hard mul ");
h_mul = hard_mul(a, b);
print_hex(h_mul, 8);
print_str(" ");
h_mulh = hard_mulh(a, b);
print_hex(h_mulh, 8);
print_str(" ");
h_mulhsu = hard_mulhsu(a, b);
print_hex(h_mulhsu, 8);
print_str(" ");
h_mulhu = hard_mulhu(a, b);
print_hex(h_mulhu, 8);
print_chr('\n');
uint32_t s_mul, s_mulh, s_mulhsu, s_mulhu;
print_str("soft mul ");
s_mul = a * b;
print_hex(s_mul, 8);
print_str(" ");
s_mulh = (as * bs) >> 32;
print_hex(s_mulh, 8);
print_str(" ");
s_mulhsu = (as * bu) >> 32;
print_hex(s_mulhsu, 8);
print_str(" ");
s_mulhu = (au * bu) >> 32;
print_hex(s_mulhu, 8);
print_str(" ");
if (s_mul != h_mul || s_mulh != h_mulh || s_mulhsu != h_mulhsu || s_mulhu != h_mulhu) {
print_str("ERROR!\n");
__asm__ volatile ("ebreak");
return;
}
print_str(" OK\n");
uint32_t h_div, h_divu, h_rem, h_remu;
print_str("hard div ");
h_div = hard_div(a, b);
print_hex(h_div, 8);
print_str(" ");
h_divu = hard_divu(a, b);
print_hex(h_divu, 8);
print_str(" ");
h_rem = hard_rem(a, b);
print_hex(h_rem, 8);
print_str(" ");
h_remu = hard_remu(a, b);
print_hex(h_remu, 8);
print_chr('\n');
uint32_t s_div, s_divu, s_rem, s_remu;
print_str("soft div ");
s_div = b ? as / bs : 0xffffffff;
print_hex(s_div, 8);
print_str(" ");
s_divu = b ? au / bu : 0xffffffff;
print_hex(s_divu, 8);
print_str(" ");
s_rem = b ? as % bs : a;
print_hex(s_rem, 8);
print_str(" ");
s_remu = b ? au % bu : a;
print_hex(s_remu, 8);
print_str(" ");
if (s_div != h_div || s_divu != h_divu || s_rem != h_rem || s_remu != h_remu) {
print_str("ERROR!\n");
__asm__ volatile ("ebreak");
return;
}
print_str(" OK\n");
}
}
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