[LLVMbugs] [Bug 4278] New: X86-64 -tailcallopt calling convention specification seems out-of-sync with regular cc

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4278

           Summary: X86-64 -tailcallopt calling convention specification
                    seems out-of-sync with regular cc
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: fvbommel at wxs.nl
                CC: llvmbugs at cs.uiuc.edu


In CC_X86_64_TailCall (X86CallingConv.td), there are several differences from
CC_X86_64_C that are not explained (AFAICT) by the need to support tail calls.
* It doesn't support fp80 arguments (causing a "Formal argument #0 has
unhandled type f80" abort).
* v2f32 doesn't seem to be handled either.
* The code that puts MMX vectors in XMM registers on Darwin doesn't check
CCIfSubtarget<"hasSSE2()"> like it does for regular calls.

Also, the comment for the integer registers is a copy-paste-o; there are only 5
of them for tail calls, not 6.


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