I added the |0 optimization to JSC’s optimizer before asm.js was a thing. It worked for any use of a number in bit math, so like ~~x also had the same effect as

I added the |0 optimization to JSC’s optimizer before asm.js was a thing. It worked for any use of a number in bit math, so like ~~x also had the same effect as x|0. Hilariously, I didn’t actually do the folding of x|0 to x because I didn’t know folks would do that. I just wanted to eliminate int overflow checks if the use didn’t care about the high bits. We only implemented the folding once asm.js became a thing.