diff options
Diffstat (limited to '05/util.b')
| -rw-r--r-- | 05/util.b | 75 |
1 files changed, 72 insertions, 3 deletions
@@ -25,6 +25,75 @@ function full_multiply_signed *8p_upper = upper return + +function divmod_unsigned + argument a + argument b + argument p_quotient + argument p_remainder + local q + local r + + ; mov rax, [rbp-16] + byte 0x48 + byte 0x8b + byte 0x85 + byte 0xf0 + byte 0xff + byte 0xff + byte 0xff + + ; mov rbx, rax + byte 0x48 + byte 0x89 + byte 0xc3 + + ; mov rax, [rbp-8] + byte 0x48 + byte 0x8b + byte 0x85 + byte 0xf8 + byte 0xff + byte 0xff + byte 0xff + + ; xor edx, edx + byte 0x31 + byte 0xd2 + + ; div rbx + byte 0x48 + byte 0xf7 + byte 0xf3 + + ; mov [rbp-40], rax + byte 0x48 + byte 0x89 + byte 0x85 + byte 0xd8 + byte 0xff + byte 0xff + byte 0xff + + ; mov rax, rdx + byte 0x48 + byte 0x89 + byte 0xd0 + + ; mov [rbp-48], rax + byte 0x48 + byte 0x89 + byte 0x85 + byte 0xd0 + byte 0xff + byte 0xff + byte 0xff + + *8p_quotient = q + *8p_remainder = r + + return + ; allows for negative shifts function right_shift argument x @@ -93,7 +162,8 @@ function free syscall(11, psize, size) return -; returns a pointer to a null-terminated string containing the number given +; returns a pointer to a null-terminated string containing the +; (unsigned) number given function itos global 32 itos_string argument x @@ -102,10 +172,9 @@ function itos p = &itos_string p += 30 :itos_loop - c = x % 10 + divmod_unsigned(x, 10, &x, &c) c += '0 *1p = c - x /= 10 if x == 0 goto itos_loop_end p -= 1 goto itos_loop |