[LLVMbugs] [Bug 11729] New: #pragma iwdep support

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Jan 9 07:12:06 PST 2012


             Bug #: 11729
           Summary: #pragma iwdep support
           Product: clang
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: ysangkok+llvmbugzilla at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

See also: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33426

#pragma ivdep

Says the compiler may assume the following loop nest does not have loop carried
data dependenices.

Supported at least by SGI CC and the Intel compiler.

The SGI compiler restricts the pragma to innermost loops.  The Intel compiler
restricts the pragma to affect assumed data-dependencies only, that is, if
data dependence analysis statically can prove a data-dependency this
dependency is _not_ ignored.

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