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Moved IDIV for postproc into generate block

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David Harris 2022-12-27 22:02:14 -08:00
parent d59878a886
commit a832605658
1 changed files with 73 additions and 72 deletions
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15
pipelined/src/fpu/fdivsqrt/fdivsqrtpostproc.sv
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@ -98,11 +98,14 @@ module fdivsqrtpostproc(
// Determine if sticky bit is negative // *** look for ways to optimize this. Shift shouldn't be needed. // Determine if sticky bit is negative // *** look for ways to optimize this. Shift shouldn't be needed.
assign Sum = WC + WS; assign Sum = WC + WS;
assign W = $signed(Sum) >>> `LOGR; assign NegStickyM = Sum[`DIVb+3];
assign NegStickyM = W[`DIVb+3];
assign DM = {4'b0001, D};
// *** put conditionals on integer division hardware, move to its own module assign PreQmM = NegStickyM ? FirstUM : FirstU; // Select U or U-1 depending on negative sticky bit
assign QmM = SqrtM ? (PreQmM << 1) : PreQmM;
if (`IDIV_ON_FPU) begin
assign W = $signed(Sum) >>> `LOGR;
assign DM = {4'b0001, D};
// Integer division: sign handling for div and rem // Integer division: sign handling for div and rem
always_comb always_comb
@ -170,7 +173,5 @@ module fdivsqrtpostproc(
assign SpecialFPIntDivResultM = BZeroM ? (RemOpM ? ForwardedSrcAM : {(`XLEN){1'b1}}) : PreFPIntDivResultM[`XLEN-1:0]; // special cases assign SpecialFPIntDivResultM = BZeroM ? (RemOpM ? ForwardedSrcAM : {(`XLEN){1'b1}}) : PreFPIntDivResultM[`XLEN-1:0]; // special cases
// *** conditional on RV64 // *** conditional on RV64
assign FPIntDivResultM = (W64M ? {{(`XLEN-32){SpecialFPIntDivResultM[31]}}, SpecialFPIntDivResultM[31:0]} : SpecialFPIntDivResultM[`XLEN-1:0]); // Sign extending in case of W64 assign FPIntDivResultM = (W64M ? {{(`XLEN-32){SpecialFPIntDivResultM[31]}}, SpecialFPIntDivResultM[31:0]} : SpecialFPIntDivResultM[`XLEN-1:0]); // Sign extending in case of W64
end
assign PreQmM = NegStickyM ? FirstUM : FirstU; // Select U or U-1 depending on negative sticky bit
assign QmM = SqrtM ? (PreQmM << 1) : PreQmM;
endmodule endmodule