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rocket-chip
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clean up wb->id bypass

This commit is contained in:
Andrew Waterman 2012-02-01 15:36:01 -08:00
parent c5a4eaa0a1
commit b1bbf56b74
1 changed files with 7 additions and 9 deletions
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16
rocket/src/main/scala/dpath.scala
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@ -118,6 +118,7 @@ class rocketDpath extends Component
val wb_reg_ctrl_ll_wb = Reg(resetVal = Bool(false));
val wb_reg_ctrl_wen = Reg(resetVal = Bool(false));
val wb_reg_ctrl_wen_pcr = Reg(resetVal = Bool(false));
val wb_wdata = Wire() { Bits() };
val r_dmem_resp_val = Reg(resetVal = Bool(false));
val r_dmem_resp_replay = Reg(resetVal = Bool(false));
@ -214,18 +215,16 @@ class rocketDpath extends Component
Mux(id_raddr1 != UFix(0, 5) && (ex_reg_ctrl_wen || ex_reg_ctrl_ll_wb) && id_raddr1 === ex_reg_waddr, ex_wdata,
Mux(rs1_mem_lu_bypass, io.dmem.resp_data,
Mux(id_raddr1 != UFix(0, 5) && (mem_reg_ctrl_wen || mem_reg_ctrl_ll_wb) && id_raddr1 === mem_reg_waddr, mem_reg_wdata,
Mux(id_raddr1 != UFix(0, 5) && r_dmem_resp_val && id_raddr1 === r_dmem_resp_waddr, io.dmem.resp_data_subword,
Mux(id_raddr1 != UFix(0, 5) && (wb_reg_ctrl_wen || wb_reg_ctrl_ll_wb) && id_raddr1 === wb_reg_waddr, wb_reg_wdata,
id_rdata1))))))));
Mux(id_raddr1 != UFix(0, 5) && (wb_reg_ctrl_wen || wb_reg_ctrl_ll_wb) && id_raddr1 === wb_reg_waddr, wb_wdata,
id_rdata1)))))));
val rs2_mem_lu_bypass = id_raddr2 != UFix(0, 5) && io.ctrl.mem_load && id_raddr2 === mem_reg_waddr;
val id_rs2 =
Mux(id_raddr2 != UFix(0, 5) && (ex_reg_ctrl_wen || ex_reg_ctrl_ll_wb) && id_raddr2 === ex_reg_waddr, ex_wdata,
Mux(rs2_mem_lu_bypass, io.dmem.resp_data,
Mux(id_raddr2 != UFix(0, 5) && (mem_reg_ctrl_wen || mem_reg_ctrl_ll_wb) && id_raddr2 === mem_reg_waddr, mem_reg_wdata,
Mux(id_raddr2 != UFix(0, 5) && r_dmem_resp_val && id_raddr2 === r_dmem_resp_waddr, io.dmem.resp_data_subword,
Mux(id_raddr2 != UFix(0, 5) && (wb_reg_ctrl_wen || wb_reg_ctrl_ll_wb) && id_raddr2 === wb_reg_waddr, wb_reg_wdata,
id_rdata2)))));
Mux(id_raddr2 != UFix(0, 5) && (wb_reg_ctrl_wen || wb_reg_ctrl_ll_wb) && id_raddr2 === wb_reg_waddr, wb_wdata,
id_rdata2))));
io.ctrl.mem_lu_bypass := rs1_mem_lu_bypass || rs2_mem_lu_bypass;
io.ctrl.inst := id_reg_inst;
@ -406,12 +405,11 @@ class rocketDpath extends Component
wb_reg_ctrl_wen_pcr <== mem_reg_ctrl_wen_pcr;
}
// crossbar/sign extension for 8/16 bit loads (moved to earlier in file)
// regfile write
wb_wdata := Mux(Reg(io.ctrl.mem_load), io.dmem.resp_data_subword, wb_reg_wdata)
rfile.io.w0.addr := wb_reg_waddr;
rfile.io.w0.en := wb_reg_ctrl_wen || wb_reg_ctrl_ll_wb;
rfile.io.w0.data := Mux(Reg(io.ctrl.mem_load), io.dmem.resp_data_subword, wb_reg_wdata);
rfile.io.w0.data := wb_wdata
io.ctrl.wb_waddr := wb_reg_waddr;