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Started Integer Preprocessing

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This commit is contained in:
cturek 2022-10-25 17:48:43 +00:00
parent d4dd2dcc08
commit 94daa961b3
2 changed files with 8 additions and 3 deletions
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2
pipelined/src/fpu/fdivsqrt/fdivsqrt.sv
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@ -67,7 +67,7 @@ module fdivsqrt(
fdivsqrtpreproc fdivsqrtpreproc( fdivsqrtpreproc fdivsqrtpreproc(
.clk, .DivStartE, .Xm(XmE), .QeM, .Xe(XeE), .Fmt(FmtE), .Ye(YeE), .clk, .DivStartE, .Xm(XmE), .QeM, .Xe(XeE), .Fmt(FmtE), .Ye(YeE),
.Sqrt(SqrtE), .Ym(YmE), .XZero(XZeroE), .X, .Dpreproc, .Sqrt(SqrtE), .Int(MDUE), .Ym(YmE), .XZero(XZeroE), .X, .Dpreproc,
.ForwardedSrcAE, .ForwardedSrcBE, .Funct3E, .Funct3M, .MDUE, .W64E); .ForwardedSrcAE, .ForwardedSrcBE, .Funct3E, .Funct3M, .MDUE, .W64E);
fdivsqrtfsm fdivsqrtfsm( fdivsqrtfsm fdivsqrtfsm(
.clk, .reset, .FmtE, .XsE, .SqrtE, .clk, .reset, .FmtE, .XsE, .SqrtE,

7
pipelined/src/fpu/fdivsqrt/fdivsqrtpreproc.sv
View File

@ -37,6 +37,7 @@ module fdivsqrtpreproc (
input logic [`NE-1:0] Xe, Ye, input logic [`NE-1:0] Xe, Ye,
input logic [`FMTBITS-1:0] Fmt, input logic [`FMTBITS-1:0] Fmt,
input logic Sqrt, input logic Sqrt,
input logic Int,
input logic XZero, input logic XZero,
input logic [`XLEN-1:0] ForwardedSrcAE, ForwardedSrcBE, // *** these are the src outputs before the mux choosing between them and PCE to put in srcA/B input logic [`XLEN-1:0] ForwardedSrcAE, ForwardedSrcBE, // *** these are the src outputs before the mux choosing between them and PCE to put in srcA/B
input logic [2:0] Funct3E, Funct3M, input logic [2:0] Funct3E, Funct3M,
@ -49,6 +50,7 @@ module fdivsqrtpreproc (
// logic [`DIVLEN-1:0] ExtraA, ExtraB, PreprocA, PreprocB, PreprocX, PreprocY; // logic [`DIVLEN-1:0] ExtraA, ExtraB, PreprocA, PreprocB, PreprocX, PreprocY;
logic [`NF-1:0] PreprocA, PreprocX; logic [`NF-1:0] PreprocA, PreprocX;
logic [`NF-1:0] PreprocB, PreprocY; logic [`NF-1:0] PreprocB, PreprocY;
// logic [`DIVN-1:0] ZeroBufX, ZeroBufY; add after Cedar Commit
logic [`NF+1:0] SqrtX; logic [`NF+1:0] SqrtX;
logic [`DIVb+3:0] DivX; logic [`DIVb+3:0] DivX;
logic [$clog2(`NF+2)-1:0] XZeroCnt, YZeroCnt; logic [$clog2(`NF+2)-1:0] XZeroCnt, YZeroCnt;
@ -56,6 +58,9 @@ module fdivsqrtpreproc (
// ***can probably merge X LZC with conversion // ***can probably merge X LZC with conversion
// cout the number of leading zeros // cout the number of leading zeros
// Muxes needed for Int; add after Cedar Commit
// assign ZeroBufX = Int ? {ForwardedSrcAE, {`DIVN-`XLEN{1'b0}}} : {Xm, {`DIVN-`NF{1'b0}}};
// assign ZeroBufY = Int ? {ForwardedSrcBE, {`DIVN-`XLEN{1'b0}}} : {Ym, {`DIVN-`NF{1'b0}}};
lzc #(`NF+1) lzcX (Xm, XZeroCnt); lzc #(`NF+1) lzcX (Xm, XZeroCnt);
lzc #(`NF+1) lzcY (Ym, YZeroCnt); lzc #(`NF+1) lzcY (Ym, YZeroCnt);
@ -65,7 +70,7 @@ module fdivsqrtpreproc (
assign SqrtX = Xe[0]^XZeroCnt[0] ? {1'b0, ~XZero, PreprocX} : {~XZero, PreprocX, 1'b0}; assign SqrtX = Xe[0]^XZeroCnt[0] ? {1'b0, ~XZero, PreprocX} : {~XZero, PreprocX, 1'b0};
assign DivX = {3'b000, ~XZero, PreprocX, {`DIVb-`NF{1'b0}}}; assign DivX = {3'b000, ~XZero, PreprocX, {`DIVb-`NF{1'b0}}};
// *** explain why X is shifted between radices // *** explain why X is shifted between radices (initial assignment of WS=RX)
if (`RADIX == 2) assign X = Sqrt ? {3'b111, SqrtX, {`DIVb-1-`NF{1'b0}}} : DivX; if (`RADIX == 2) assign X = Sqrt ? {3'b111, SqrtX, {`DIVb-1-`NF{1'b0}}} : DivX;
else assign X = Sqrt ? {2'b11, SqrtX, {`DIVb-1-`NF{1'b0}}, 1'b0} : DivX; else assign X = Sqrt ? {2'b11, SqrtX, {`DIVb-1-`NF{1'b0}}, 1'b0} : DivX;
assign Dpreproc = {PreprocY, {`DIVN-1-`NF{1'b0}}}; assign Dpreproc = {PreprocY, {`DIVN-1-`NF{1'b0}}};