[PATCH,committed] Xilinx FPU cleanup

[David Edelsohn]

Following the addition of Xilinx support, I committed the appended
cleanup patch.

Patterns for the original POWER architecture had been updated
with TARGET_SINGLE_FLOAT and fp_type attribute although they
never will be used by PowerPC Xilinx.

I also fixed a few formatting issues with extra spaces and missing
indentation.

Bootstrapped on powerpc-ibm-aix5.3.0.0

        * config/rs6000/rs6000.md (aux_truncdfsf2): Remove TARGET_SINGLE_FLOAT.
        (addsf3, subsf3, mulsf3 ! TARGET_POWERPC): Remove TARGET_SINGLE_FLOAT
        and fp_type.
        (divdf3): Reformat long line.

David
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