diff options
Diffstat (limited to 'picorv32/firmware/multest.c')
-rw-r--r-- | picorv32/firmware/multest.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/picorv32/firmware/multest.c b/picorv32/firmware/multest.c new file mode 100644 index 0000000..1706400 --- /dev/null +++ b/picorv32/firmware/multest.c @@ -0,0 +1,151 @@ +// 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"); + } +} + |