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...compiler is being conservative about errno (which sqrt in libm can set, but "sqrtss" doesn't). Try building with -fno-math-errno. -Chris -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130517/2074c7c2/attachment.html>

Using the following example program #include <math.h> double f(double d){ return sqrt(d); } and compiling it with "clang -O3 ...", I was trying to determine what it would take to get the X86 code generator to replace the call to sqrt with a sqrtsd instruction inline. It turns out that it could do exactly that, were it not for the fact that in the function