https://llvm.org/bugs/show_bug.cgi?id=24094

            Bug ID: 24094
           Summary: MIPS integrated assembler incorrectly warns for t4-t7
                    usage
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: MIPS
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
    Classification: Unclassified

The N32 ABI (and Wikipedia and the implementation in GCC) name registers
$12-$15 $t4-$t7.  GCC, as an extension, allows $8-$11 to be referred to as
$t0-$t3 in all modes and as $a4-$17 in N modes.

Recent LLVM has introduced a regression, warning if $t4-$t7 are used and
suggesting that they be replaced with $t0-$t3.  This warning is the exact
inverse of a useful warning (suggesting that $t0-$t3 be replaced with $t4-$t7).

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