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2006-05-04 Richard Guenther <rguenther@suse.de> PR tree-optimization/14287 PR tree-optimization/14844 PR tree-optimization/19792 PR tree-optimization/21608 PR tree-optimization/27090 * tree-ssa-pre.c (try_combine_conversion): New function. (compute_avail): After constructing the value-handle expression, use try_combine_conversion to combine NOP_EXPRs with previous value-handle expressions and use the result if it is available. * gcc.dg/tree-ssa/ssa-fre-1.c: New testcase. * gcc.dg/tree-ssa/ssa-fre-2.c: Likewise. * gcc.dg/tree-ssa/ssa-fre-3.c: Likewise. * gcc.dg/tree-ssa/ssa-fre-4.c: Likewise. * gcc.dg/tree-ssa/ssa-fre-5.c: Likewise. From-SVN: r113527
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