[llvm-bugs] [Bug 38097] New: feature request: target_clones, to compile a given section multiple times and generate ifunc function to wrap it

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38097

            Bug ID: 38097
           Summary: feature request: target_clones, to compile a given
                    section multiple times and generate ifunc function to
                    wrap it
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: danielgb at au1.ibm.com
                CC: llvm-bugs at lists.llvm.org

Like:
https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-target_005fclones-function-attribute

This allows the same code, which may have an ideal optimization under a
particular CPU/feature, but can fall back the lowest supported feature from
-mcpu=.

This could take different cpus, or subtarget features like target attribute
(http://clang.llvm.org/docs/AttributeReference.html#target-gnu-tar)

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