Back in the era of these consoles they were using pretty exotic architectures, like the PS2 emotion engine with a MIPS CPU and wacky parallel vector/GPU processing engine (along with a whole PS1 CPU bolted on to poll inputs and other tasks). You didn't really get good C library support and were extremely lucky to even have a good C compiler and library in the early days of their launch. It wasn't like GCC had a command line flag to flip and suddenly get an optimized PS2 compatible binary built.