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turn off IDIVONFPU when FSUPPORTED=0. Already checked in sim, but need it in synth too for feature sweep

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This commit is contained in:
David Harris 2023-11-17 20:25:24 -08:00
parent 96556064a4
commit acc2db256f
3 changed files with 4 additions and 4 deletions
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4
config/rv32gc/config.vh
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@ -74,8 +74,8 @@ localparam ICACHE_LINELENINBITS = 32'd512;
// Integer Divider Configuration // Integer Divider Configuration
// IDIV_BITSPERCYCLE must be 1, 2, or 4 // IDIV_BITSPERCYCLE must be 1, 2, or 4
localparam IDIV_BITSPERCYCLE = 32'd4; localparam IDIV_BITSPERCYCLE = 32'd2;
localparam IDIV_ON_FPU = 1; localparam IDIV_ON_FPU = 0;
// Legal number of PMP entries are 0, 16, or 64 // Legal number of PMP entries are 0, 16, or 64
localparam PMP_ENTRIES = 32'd16; localparam PMP_ENTRIES = 32'd16;

2
src/ieu/datapath.sv
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@ -131,7 +131,7 @@ module datapath import cvw::*; #(parameter cvw_t P) (
if (P.F_SUPPORTED) begin:fpmux if (P.F_SUPPORTED) begin:fpmux
mux2 #(P.XLEN) resultmuxM(IEUResultM, FIntResM, FWriteIntM, IFResultM); mux2 #(P.XLEN) resultmuxM(IEUResultM, FIntResM, FWriteIntM, IFResultM);
mux2 #(P.XLEN) cvtresultmuxW(IFResultW, FCvtIntResW, FCvtIntW, IFCvtResultW); mux2 #(P.XLEN) cvtresultmuxW(IFResultW, FCvtIntResW, FCvtIntW, IFCvtResultW);
if (P.IDIV_ON_FPU) begin if (P.IDIV_ON_FPU & P.F_SUPPORTED) begin
mux2 #(P.XLEN) divresultmuxW(MDUResultW, FIntDivResultW, IntDivW, MulDivResultW); mux2 #(P.XLEN) divresultmuxW(MDUResultW, FIntDivResultW, IntDivW, MulDivResultW);
end else begin end else begin
assign MulDivResultW = MDUResultW; assign MulDivResultW = MDUResultW;

2
src/mdu/mdu.sv
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@ -57,7 +57,7 @@ module mdu import cvw::*; #(parameter cvw_t P) (
// Start a divide when a new division instruction is received and the divider isn't already busy or finishing // Start a divide when a new division instruction is received and the divider isn't already busy or finishing
// When IDIV_ON_FPU is set, use the FPU divider instead // When IDIV_ON_FPU is set, use the FPU divider instead
// In ZMMUL, with M_SUPPORTED = 0, omit the divider // In ZMMUL, with M_SUPPORTED = 0, omit the divider
if ((P.IDIV_ON_FPU) || (!P.M_SUPPORTED)) begin:nodiv if ((P.IDIV_ON_FPU & P.F_SUPPORTED) || (!P.M_SUPPORTED)) begin:nodiv
assign QuotM = 0; assign QuotM = 0;
assign RemM = 0; assign RemM = 0;
assign DivBusyE = 0; assign DivBusyE = 0;