[llvm-bugs] [Bug 42320] New: [X86] Implement MMX intrinsics with SSE equivalents

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42320

            Bug ID: 42320
           Summary: [X86] Implement MMX intrinsics with SSE equivalents
           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, spatel+llvm at rotateright.com

Similar to what's been proposed recently for gcc, we should investigate
promoting MMX intrinsics to SSE equivalents:

https://gcc.gnu.org/ml/gcc-patches/2019-02/msg00061.html

This probably would be best handled in CGBuiltin.cpp - replacing the MMX
builtins with SSE equivalents, although some can probably done in headers as
well behind a suitable define.

NOTE: This will cause a high number of subvector insertions/extractions, we
might need some mechanism to reduce this even without optimizations.

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