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Simplified integer division preprocessing in fdivsqrt

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This commit is contained in:
David Harris 2023-04-06 16:43:28 -07:00
parent f810ad3cec
commit ce931d1fc5
1 changed files with 8 additions and 14 deletions
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22
src/fpu/fdivsqrt/fdivsqrtpreproc.sv
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@ -61,7 +61,7 @@ module fdivsqrtpreproc (
if (`IDIV_ON_FPU) begin:intpreproc // Int Supported
logic signedDiv, NegQuotE;
logic AsBit, BsBit, AsE, BsE, ALTBE;
logic AsE, BsE, ALTBE;
logic [`XLEN-1:0] AE, BE, PosA, PosB;
logic [`DIVBLEN:0] ZeroDiff, p;
@ -71,22 +71,16 @@ module fdivsqrtpreproc (
// Source handling
if (`XLEN==64) begin // 64-bit, supports W64
mux2 #(1) azeromux(~(|ForwardedSrcAE), ~(|ForwardedSrcAE[31:0]), W64E, AZeroE);
mux2 #(1) bzeromux(~(|ForwardedSrcBE), ~(|ForwardedSrcBE[31:0]), W64E, BZeroE);
mux2 #(1) abitmux(ForwardedSrcAE[63], ForwardedSrcAE[31], W64E, AsBit);
mux2 #(1) bbitmux(ForwardedSrcBE[63], ForwardedSrcBE[31], W64E, BsBit);
mux2 #(64) amux(ForwardedSrcAE, {{(`XLEN-32){AsE}}, ForwardedSrcAE[31:0]}, W64E, AE);
mux2 #(64) bmux(ForwardedSrcBE, {{(`XLEN-32){BsE}}, ForwardedSrcBE[31:0]}, W64E, BE);
assign AsE = signedDiv & AsBit;
assign BsE = signedDiv & BsBit;
mux2 #(64) amux(ForwardedSrcAE, {{32{ForwardedSrcAE[31] & signedDiv}}, ForwardedSrcAE[31:0]}, W64E, AE);
mux2 #(64) bmux(ForwardedSrcBE, {{32{ForwardedSrcBE[31] & signedDiv}}, ForwardedSrcBE[31:0]}, W64E, BE);
end else begin // 32 bits only
assign AsE = signedDiv & ForwardedSrcAE[31];
assign BsE = signedDiv & ForwardedSrcBE[31];
assign AE = ForwardedSrcAE;
assign BE = ForwardedSrcBE;
assign AZeroE = ~(|ForwardedSrcAE);
assign BZeroE = ~(|ForwardedSrcBE);
end
end
assign AZeroE = ~(|AE);
assign BZeroE = ~(|BE);
assign AsE = AE[`XLEN-1] & signedDiv;
assign BsE = BE[`XLEN-1] & signedDiv;
// Force integer inputs to be postiive
mux2 #(`XLEN) posamux(AE, -AE, AsE, PosA);