[LLVMbugs] [Bug 20528] New: [mips] Tracking ticket for big-endian N32/N64 ABI issues

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20528

            Bug ID: 20528
           Summary: [mips] Tracking ticket for big-endian N32/N64 ABI
                    issues
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: daniel.sanders at imgtec.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

There appears to be a number of issues in the N32/N64 ABI's on big-endian
targets. The ones identified so far include:
* Stack arguments smaller than 64-bit are put in the wrong 32-bit word
* Likewise for va_arg
* Floating point stack arguments are correctly stored at the lowest part of the
address but their handling is tangled with integers so fixing the previous bugs
breaks this.
* i8, i16, i32 arguments are not promoted to i64 as per some documentation and
GCC.
* Structures are not stored in the lowest possible address

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