re PR middle-end/168 (Spurious signed/unsigned comparison warning)
PR middle-end/168 * fold-const.c (tree_expr_nonnegative_p): Handle addition and multiplication of zero extensions, floating point division, and integer<->fp, fp<->fp and zero extension conversions. The built-in ceil and floor functions preserve signedness. * gcc.dg/20030612-1.c: New test case. From-SVN: r67850
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gcc/testsuite/gcc.dg/20030612-1.c
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