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removed unused signal from FMA

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This commit is contained in:
Katherine Parry 2022-05-27 16:47:56 -07:00
parent 06d4c05b3d
commit 9c58c63864
1 changed files with 2 additions and 38 deletions
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40
pipelined/src/fpu/fma.sv
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@ -114,7 +114,6 @@ module fma1(
output logic [$clog2(3*`NF+7)-1:0] NormCntE // normalization shift cnt output logic [$clog2(3*`NF+7)-1:0] NormCntE // normalization shift cnt
); );
logic [`NE-1:0] Denorm; // value of a denormaized number based on precision
logic [2*`NF+1:0] ProdManE; // 1.X frac * 1.Y frac in U(2.2Nf) format logic [2*`NF+1:0] ProdManE; // 1.X frac * 1.Y frac in U(2.2Nf) format
logic [3*`NF+5:0] AlignedAddendE; // Z aligned for addition in U(NF+5.2NF+1) logic [3*`NF+5:0] AlignedAddendE; // Z aligned for addition in U(NF+5.2NF+1)
logic [3*`NF+6:0] AlignedAddendInv; // aligned addend possibly inverted logic [3*`NF+6:0] AlignedAddendInv; // aligned addend possibly inverted
@ -131,7 +130,7 @@ module fma1(
// calculate the product's exponent // calculate the product's exponent
expadd expadd(.FmtE, .XExpE, .YExpE, .XZeroE, .YZeroE, expadd expadd(.FmtE, .XExpE, .YExpE, .XZeroE, .YZeroE,
.Denorm, .ProdExpE); .ProdExpE);
// multiplication of the mantissa's // multiplication of the mantissa's
mult mult(.XManE, .YManE, .ProdManE); mult mult(.XManE, .YManE, .ProdManE);
@ -140,7 +139,7 @@ module fma1(
// Alignment shifter // Alignment shifter
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
align align(.ZExpE, .ZManE, .XZeroE, .YZeroE, .ZZeroE, .ProdExpE, .Denorm, .XExpE, .YExpE, align align(.ZExpE, .ZManE, .XZeroE, .YZeroE, .ZZeroE, .ProdExpE, .XExpE, .YExpE,
.AlignedAddendE, .AddendStickyE, .KillProdE); .AlignedAddendE, .AddendStickyE, .KillProdE);
// calculate the signs and take the opperation into account // calculate the signs and take the opperation into account
@ -165,43 +164,9 @@ module expadd(
input logic [`FPSIZES/3:0] FmtE, // precision input logic [`FPSIZES/3:0] FmtE, // precision
input logic [`NE-1:0] XExpE, YExpE, // input exponents input logic [`NE-1:0] XExpE, YExpE, // input exponents
input logic XZeroE, YZeroE, // are the inputs zero input logic XZeroE, YZeroE, // are the inputs zero
output logic [`NE-1:0] Denorm, // value of denormalized exponent
output logic [`NE+1:0] ProdExpE // product's exponent B^(1023)NE+2 output logic [`NE+1:0] ProdExpE // product's exponent B^(1023)NE+2
); );
// denormalized numbers have diffrent values depending on which precison it is.
// FLEN - 1
// Other - BIAS - other bias + 1
if (`FPSIZES == 1) begin
assign Denorm = 1;
end else if (`FPSIZES == 2) begin
assign Denorm = FmtE ? (`NE)'(1) : (`NE)'(`BIAS)-(`NE)'(`BIAS1)+(`NE)'(1);
end else if (`FPSIZES == 3) begin
always_comb begin
case (FmtE)
`FMT: Denorm = 1;
`FMT1: Denorm = `BIAS-`BIAS1+1;
`FMT2: Denorm = `BIAS-`BIAS2+1;
default: Denorm = 1'bx;
endcase
end
end else if (`FPSIZES == 4) begin
always_comb begin
case (FmtE)
2'h3: Denorm = 1;
2'h1: Denorm = `BIAS-`D_BIAS+1;
2'h0: Denorm = `BIAS-`S_BIAS+1;
2'h2: Denorm = `BIAS-`H_BIAS+1;
endcase
end
end
// kill the exponent if the product is zero - either X or Y is 0 // kill the exponent if the product is zero - either X or Y is 0
assign ProdExpE = ({2'b0, XExpE} + {2'b0, YExpE} - {2'b0, (`NE)'(`BIAS)})&{`NE+2{~(XZeroE|YZeroE)}}; assign ProdExpE = ({2'b0, XExpE} + {2'b0, YExpE} - {2'b0, (`NE)'(`BIAS)})&{`NE+2{~(XZeroE|YZeroE)}};
@ -254,7 +219,6 @@ module align(
input logic [`NF:0] ZManE, // fractions in U(0.NF) format] input logic [`NF:0] ZManE, // fractions in U(0.NF) format]
input logic XZeroE, YZeroE, ZZeroE, // is the input zero input logic XZeroE, YZeroE, ZZeroE, // is the input zero
input logic [`NE+1:0] ProdExpE, // the product's exponent input logic [`NE+1:0] ProdExpE, // the product's exponent
input logic [`NE-1:0] Denorm, // the biased value of a denormalized number
output logic [3*`NF+5:0] AlignedAddendE, // Z aligned for addition in U(NF+5.2NF+1) output logic [3*`NF+5:0] AlignedAddendE, // Z aligned for addition in U(NF+5.2NF+1)
output logic AddendStickyE, // Sticky bit calculated from the aliged addend output logic AddendStickyE, // Sticky bit calculated from the aliged addend
output logic KillProdE // should the product be set to zero output logic KillProdE // should the product be set to zero