riscv/rocket-chip
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add config option to trade mul/div area for speed

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This commit is contained in:
Andrew Waterman
2013-01-06 03:47:17 -08:00
parent ce9f4881d2
commit 78868f6075
2 changed files with 4 additions and 2 deletions
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3
rocket/src/main/scala/dpath.scala
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@ -159,7 +159,8 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
alu.io.in1 := ex_rs1.toUFix
// multiplier and divider
val div = new MulDiv(mulUnroll = 4, earlyOut = true)
val div = new MulDiv(mulUnroll = if (conf.fastMulDiv) 8 else 1,
earlyOut = conf.fastMulDiv)
div.io.req.valid := io.ctrl.div_mul_val
div.io.req.bits.dw := ex_reg_ctrl_fn_dw
div.io.req.bits.fn := ex_reg_ctrl_fn_alu