gcc accepts
__asm__ ( "" : : : "%cc");
but not clang:
error: unknown register name '%cc' in asm
:"%cc", "%edx" // edx and condition codes clobbered
'cc' is not a register, thus '%cc' is rightfully not accepted.
Repro: build the project on x86_64 with:
cmake -H. -Bbuild -DCMAKE_C_COMPILER=clang -DCMAKE_SIZEOF_VOID_P=4 -DCMAKE_C_FLAGS="-m32"
These functions were already here before, and I /swear/ the slope
physics became slightly less glitchy after switching to them...
Only issue is the slope plane mapping code hasn't been properly
converted yet, so they don't render properly for now.
