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Simplify unpacker

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This commit is contained in:
David Harris 2021-07-22 13:42:16 -04:00
parent 19dac66264
commit b53eb6d030
1 changed files with 7 additions and 5 deletions
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12
wally-pipelined/src/fpu/unpacking.sv
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@ -27,10 +27,12 @@ module unpacking (
assign YSgnE = FmtE ? Y[63] : Y[31];
assign ZSgnE = FmtE ? Addend[63]^FOpCtrlE[0] : Addend[31]^FOpCtrlE[0]; // *** Maybe this should be done in the FMA for modularity?
//assign XExpE = FmtE ? X[62:52] : {X[30], {3{~X[30]&~XExpZero|XExpMaxE}}, X[29:23]};
assign XExpE = FmtE ? X[62:52] : {3'b0, X[30:23]}; // *** maybe convert to full number of bits here?
assign XExpE = FmtE ? X[62:52] : {X[30], {3{~X[30]&~XExpZero|XExpMaxE}}, X[29:23]};
assign YExpE = FmtE ? Y[62:52] : {Y[30], {3{~Y[30]&~YExpZero|YExpMaxE}}, Y[29:23]};
assign ZExpE = FmtE ? Addend[62:52] : {Addend[30], {3{~Addend[30]&~ZExpZero|ZExpMaxE}}, Addend[29:23]};
/* assign XExpE = FmtE ? X[62:52] : {3'b0, X[30:23]}; // *** maybe convert to full number of bits here?
assign YExpE = FmtE ? Y[62:52] : {3'b0, Y[30:23]};
assign ZExpE = FmtE ? Addend[62:52] : {3'b0, Addend[30:23]};
assign ZExpE = FmtE ? Addend[62:52] : {3'b0, Addend[30:23]};*/
assign XFracE = FmtE ? X[51:0] : {X[22:0], 29'b0};
assign YFracE = FmtE ? Y[51:0] : {Y[22:0], 29'b0};
@ -78,7 +80,7 @@ module unpacking (
assign YZeroE = YExpZero & YFracZero;
assign ZZeroE = ZExpZero & ZFracZero;
assign BiasE = FmtE ? 13'h3ff : 13'h7f; // *** is it better to convert to full precision exponents so bias isn't needed?
//assign BiasE = 13'h3ff; // always use 1023 because exponents are unpacked to double precision
//assign BiasE = FmtE ? 13'h3ff : 13'h7f; // *** is it better to convert to full precision exponents so bias isn't needed?
assign BiasE = 13'h3ff; // always use 1023 because exponents are unpacked to double precision
endmodule