Re:The 29th International Obfuscated C Code Contest (IOCCC) ...
by jpegqs on Monday June 08, 2026 @02:37PM
(#48449483)
> 3 If the low bit on any operand is set, remove it, and replace that operand with m[operand] i.e., a dereference of that address
This dereference option makes a second instruction, this is not OISC.
>This VM implements an OISC - a One Instruction Set Computer. That instruction takes three signed 32-bit operands, a, b and c, and runs a program from memory m[] as follows:
1 PC (program counter) starts at 0
2 Fetch the next instruction (32-bit signed operands a, b and c)
3 If the low bit on any operand is set, remove it, and replace that operand with m[operand] i.e., a dereference of that address
4 Set m[b] = m[b] - m[a]
5 If m[b] is 0 or negative, set the PC to c, otherwise increment PC by 3 words
6 Go to step 2