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I strongly suspect the ARM compiler is not optimized for 128b mults and just calls a generic software function to do the computation

like this one: https://github.com/llvm-mirror/compiler-rt/blob/master/lib/b...

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For 64-bit ARM there are no function calls when using clang: https://godbolt.org/z/IR2DIj

you're right, and even on old versions of gcc and clang it seems that it is correctly generated as mul + umulh pair

I just wanted to thank you for this website. It is putting end to so many discussions we have about the quality of the code. Extra, it has a support for FORTRAN. Previously we were doing debug and disassembly ourselves.

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