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* config/mips/mips.c (mips_expand_prologue): Use a single insn to allocate 32768 bytes of stack. Use addition rather than subtraction when a single insn is enough. * config/mips/mips.md: Remove insns and splitters for subtracting constants. (subsi3): Only accept register operands. (subsi3_internal): Likewise. Use for TARGET_MIPS16 as well. (subdi3_internal_3, subsi3_internal_2): Likewise. (casesi): Use expand_binop to subtract the lower bound. From-SVN: r69357
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