[LLVMbugs] [Bug 11211] New: Clang fails to optimize in-sequence extract operations

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat Oct 22 16:59:39 PDT 2011


           Summary: Clang fails to optimize in-sequence extract operations
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: maister at archlinux.us
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=7502)
 --> (http://llvm.org/bugs/attachment.cgi?id=7502)
C and disasm

Implementing a trivial float to int16_t conversion routine, Clang is unable to
optimize 8 subsequent extract/store operations into one single unaligned store.

Code and x86_64 disasm in attachment.

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