Patch (revised): fix compress_float_constant heuristics

[Dale Johannesen]

This version incorporates all comments (no one has commented on alpha).
I haven't retested extensively, but all testcases still work.  OK?

2005-07-10  Dale Johannesen  <dalej@apple.com>

         * expr.c (compress_float_constant):  Add cost check.
         * config/rs6000.c (rs6000_rtx_cost):  Adjust FLOAT_EXTEND cost.

2005-07-10  Dale Johannesen  <dalej@apple.com>

         * gcc.target/i386/compress-float-sse.c:  New.
         * gcc.target/i386/compress-float-sse-pic.c:  New.
         * gcc.target/i386/compress-float-387.c:  New.
         * gcc.target/i386/compress-float-387-pic.c:  New.
         * gcc.dg/compress-float-ppc.c:  New.
         * gcc.dg/compress-float-ppc-pic.c:  New.

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