[llvm-bugs] [Bug 44125] New: [X86] Make preferred execution domain target specific

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https://bugs.llvm.org/show_bug.cgi?id=44125

            Bug ID: 44125
           Summary: [X86] Make preferred execution domain target specific
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, peter at cordes.ca,
                    spatel+llvm at rotateright.com

We currently always prefer the fp domain for vector instructions, I think
mainly to minimize codesize, but some targets (e.g. more recent Intel big
cores) can execute the integer equivalent instructions on more ports and can
easily absorb the codesize increase in the frontend.

We should be able to override the preferred domain for specific target cpus,
although maybe still always chose fp for min codesize cases.

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