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Divider cleanup

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This commit is contained in:
David Harris 2021-10-03 00:41:41 -04:00
parent c690a863b5
commit 81601e26a3
1 changed files with 2 additions and 4 deletions
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4
wally-pipelined/src/muldiv/intdivrestoring.sv
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@ -42,7 +42,6 @@ module intdivrestoring (
logic Div0E, Div0M; logic Div0E, Div0M;
logic DivInitE, SignXE, SignXM, SignDE, SignDM, NegWM, NegQM; logic DivInitE, SignXE, SignXM, SignDE, SignDM, NegWM, NegQM;
logic SignedDivideM; logic SignedDivideM;
// *** add pipe stages to everything
// save inputs on the negative edge of the execute clock. // save inputs on the negative edge of the execute clock.
// This is unusual practice, but the inputs are not guaranteed to be stable due to some hazard and forwarding logic. // This is unusual practice, but the inputs are not guaranteed to be stable due to some hazard and forwarding logic.
@ -66,8 +65,6 @@ module intdivrestoring (
neg #(`XLEN) negx(XSavedE, XnE); neg #(`XLEN) negx(XSavedE, XnE);
mux2 #(`XLEN) xabsmux(XSavedE, XnE, SignedDivideE & SignXE, XInitE); // need original X as remainder if doing divide by 0 mux2 #(`XLEN) xabsmux(XSavedE, XnE, SignedDivideE & SignXE, XInitE); // need original X as remainder if doing divide by 0
// Put suffixes on XInitE, init->DivInitE, Wn, XQn
// initialization multiplexers on first cycle of operation (one cycle after start is asserted) // initialization multiplexers on first cycle of operation (one cycle after start is asserted)
mux2 #(`XLEN) wmux(WM, {`XLEN{1'b0}}, DivInitE, WE); mux2 #(`XLEN) wmux(WM, {`XLEN{1'b0}}, DivInitE, WE);
mux2 #(`XLEN) xmux(XQM, XInitE, DivInitE, XQE); mux2 #(`XLEN) xmux(XQM, XInitE, DivInitE, XQE);
@ -76,6 +73,7 @@ module intdivrestoring (
intdivrestoringstep step1(WE, XQE, DAbsBE, W1E, XQ1E); intdivrestoringstep step1(WE, XQE, DAbsBE, W1E, XQ1E);
intdivrestoringstep step2(W1E, XQ1E, DAbsBE, WNextE, XQNextE); intdivrestoringstep step2(W1E, XQ1E, DAbsBE, WNextE, XQNextE);
// registers after division steps
flopen #(`XLEN) wreg(clk, BusyE, WNextE, WM); flopen #(`XLEN) wreg(clk, BusyE, WNextE, WM);
flopen #(`XLEN) xreg(clk, BusyE, XQNextE, XQM); flopen #(`XLEN) xreg(clk, BusyE, XQNextE, XQM);