[LLVMdev] Performance regression on ARM

[Anton Korobeynikov]

> Chandler’s complex arithmetic changes are also in the range: r219557 in clang.  We saw it change the code in mandel-2 significantly.
mandel-2 is broken on hard FP ABI systems, btw. The reason is simply:
we're emitting a call to __muldc3 with AAPCS VFP calling convention,
however, the function expects softfp (AAPCS) calling conv and reads
garbage from GP registers.

I'm working on fix.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University