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Hi, For some maybe dumb reasons I try to write a portable version of int128. What is very valuable for this implementation is access to MUL instruction on x86 which provides full 64 x 64 -> 128 bit multiplication. An equally useful on ARM would be UMULH instruction. Well, the way you can access this on clang / GCC is to use __int128 type or use inline assembly. MSVC provides an intrinsic for

...4:44 PM Arthur O'Dwyer via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Hi Pawel, > > There is the _mulx_u64 intrinsic, but it currently requires the hardware > flag "-mbmi2". > > https://github.com/Quuxplusone/WideIntProofOfConcept/blob/master/wider.h#L89-L99 > > On Clang 3.8.1 and earlier, the _addcarry_u64 and _subborrow_u64 > intrinsics required the hardware flag `-madx`, even though they didn't use > the hardware ADX/ADOX instructions. Modern GCC and Clang permit the use of > these intrinsics (to generate ADC) even in the absence...

Hi llvm-dev, I've uploaded a prototype patch at https://reviews.llvm.org/D70720 which adds a new feature to llvm-objdump: displaying the location (in registers/memory/etc) of source-level variables alongside the disassembly display. I've put a demo of the output at https://reviews.llvm.org/M2. I have two use-cases in mind for this: * Users reading the disassembly of compiled code. It