notes

notes

the - operator

the - operator is actually one of the most difficult operators: it can act as

• sign -3
• sign-flip operation -i == i*-1
• subtraction a-3
• range age 12-15, 7000-6000 BC usually for unsigned

Figuring out which is which needs special care! -1-2-‖-3‖-4

abs norm

abs via float is still better than function calls as emitted by gcc -O3 !!

(func $abs (type 2) (param i32) (result i32) (local i32) local.get 0 local.get 0 i32.const 31 i32.shr_s local.tee 1 i32.add local.get 1 i32.xor)