add config option to trade mul/div area for speed
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@ -159,7 +159,8 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
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alu.io.in1 := ex_rs1.toUFix
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// multiplier and divider
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val div = new MulDiv(mulUnroll = 4, earlyOut = true)
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val div = new MulDiv(mulUnroll = if (conf.fastMulDiv) 8 else 1,
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earlyOut = conf.fastMulDiv)
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div.io.req.valid := io.ctrl.div_mul_val
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div.io.req.bits.dw := ex_reg_ctrl_fn_dw
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div.io.req.bits.fn := ex_reg_ctrl_fn_alu
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@ -10,7 +10,8 @@ case class RocketConfiguration(ntiles: Int, co: CoherencePolicyWithUncached,
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icache: ICacheConfig, dcache: DCacheConfig,
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fpu: Boolean, vec: Boolean,
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fastLoadWord: Boolean = true,
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fastLoadByte: Boolean = false)
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fastLoadByte: Boolean = false,
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fastMulDiv: Boolean = true)
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{
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val dcacheReqTagBits = 9 // enforce compliance with require()
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val xprlen = 64
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