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DImode for x87 on 32bit targets. Conditionally disable x87 modes with X87_ENABLE_FLOAT. Remove preparation code. (*float<SWI48:mode><MODEF:mode>2): Rename from *float<SWI48:mode><MODEF:mode>2_mixed. Handle x87, SSE and mixed math using "enabled" attribute. (*floatdi<MODEF:mode>2_i387): Rename from *float<SWI48x:mode><MODEF:mode>2_i387. Handle only DImode and enable for 32bit targets only. (floatdi<X87MODEF:mode>2_i387_with_xmm pre-reload splitter): New splitter. (floatdi<X87MODEF:mode>2_i387_with_xmm): Use register_operand as operand 1 predicate. Rewrite as define_insn_and_split. (floatdi<X87MODEF:mode>2_i387_with_xmm memory input splitter): Remove. From-SVN: r264160
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