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Hello, Recently I have stumbled across an almost double performance decrease in one of my codebases when compiling with clang instead of gcc. I was testing with the currently latest 3.9.1 as well as 4.0.0 rc2 targeting x86-64 darwin with -Ofast, and after some investigation was able to narrow down the code to the following snippet: __attribute__ ((noinline)) bool calculate(double c) { uint32_t