[LLVMbugs] [Bug 2139] New: sext i16 to i32 being turned into movzwl

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2139

           Summary: sext i16 to i32 being turned into movzwl
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1522)
 --> (http://llvm.org/bugs/attachment.cgi?id=1522)
testcase .ll

$ llc testcase.bc
$ gcc -o testcase testcase.s
$ ./testcase
Aborted (core dumped)

Inspection of the .ll shows that it should not abort.
This seems to be because an sext is being emitted as a zext.
Reduced from a recent Ada testsuite failure.


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