[LLVMbugs] [Bug 8369] New: Support mregparm flag

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Oct 12 21:20:44 PDT 2010


           Summary: Support mregparm flag
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: alp at nuanti.com
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 4068

-mregparm: Control the number registers used to pass integer arguments.

This flag is often used to override the ABI-specified regparm value throughout
a compilation unit. clang already supports target-specific values for this
provided by TargetInfo, and also by use of attributes, but the frontend doesn't
support this as a user-specified compiler flag yet.

Ignoring this is often harmless (used only for optimization) but certain code
such as that in the Linux kernel boot module using .code16gcc inline ASM relies
on mregparm working correctly.

This probably needs to be handled at a higher level than IRgen as Sema performs
checking and comparison of function regparm attributes.

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