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2014 Oct 18
2
[LLVMdev] Performance regression on ARM
...to follow this thread entirely, but if
someone gives me a Fortran testcase I can check what Fortran+llvm would do
currently and maybe give more feedback.
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2014 Oct 17
5
[LLVMdev] Performance regression on ARM
> 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.