The compile times are much longer and the generated code is usually slower except for autovectorized code. I've spent a lot of time testing both clang and gcc,

The compile times are much longer and the generated code is usually slower except for autovectorized code. I've spent a lot of time testing both clang and gcc, and right now the only part of clang I use regularly is the static analyzer in my continuous integration. For C++ in particular, the compile times are 2-3 times as long. It's unbelievable how slow it is.