[LLVMbugs] [Bug 5998] New: thumb2 UBFX not generated

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Mon Jan 11 14:49:58 PST 2010


           Summary: thumb2 UBFX not generated
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: bagel99 at gmail.com
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=4027)
 --> (http://llvm.org/bugs/attachment.cgi?id=4027)
SBFX and UBFX test

Although the signed bit-field extract pattern appears to match and generate,
the unsigned version does not.  The attached test file has three test
functions.  The first shows the SBFX generation working and the last two show
UBFX not working.  The first and second test function differ only in sext vs.

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