[PATCH] D48606: [X86] Use bts/btr/btc for single bit set/clear/complement of a variable bit position

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

I'll add the 16-bit tests.

Memory patterns shouldn't be done. BTR/S/C from memory have strange semantics(they don't ignore unused bits of the index) and are really slow because they recompute the memory address using all bits of the index register.

What do you mean patterns with immediates?


https://reviews.llvm.org/D48606