Github_Repos/cvw
1
0
Fork 1
mirror of https://github.com/openhwgroup/cvw synced 2025-02-11 06:05:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

FMA cleanup

Browse Source
This commit is contained in:
David Harris 2022-08-02 07:42:32 -07:00
parent baeafc4fd2
commit b13cdf79b3
1 changed files with 3 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
pipelined/src/fpu/fmaadd.sv
View File

@ -51,10 +51,10 @@ module fmaadd(
// Addition
///////////////////////////////////////////////////////////////////////////////
// Choose an inverted or non-inverted addend - the one has to be added now for the LZA
// Choose an inverted or non-inverted addend. Put carry into adder/LZA for addition
assign AmInv = InvA ? ~Am : Am;
// Kill the product if the product is too small to effect the addition (determined in fma1.sv)
assign PmKilled = Pm&{2*`NF+2{~KillProd}};
assign PmKilled = KillProd ? '0 : Pm;
// Do the addition
// - calculate a positive and negitive sum in parallel
// Zsticky Psticky
@ -64,15 +64,12 @@ module fmaadd(
assign {NegSum, PreSum} = {{`NF+3{1'b0}}, PmKilled, 1'b0, InvA&ZmSticky&KillProd} + {InvA, AmInv} + {{3*`NF+6{1'b0}}, InvA&~((ZmSticky&~KillProd))};
assign NegPreSum = Am + {{`NF+2{1'b1}}, ~PmKilled, 2'b11} + {(3*`NF+4)'(0), ZmSticky&~KillProd, ~(ZmSticky)};
// Is the sum negitive
// assign NegSum = PreSum[3*`NF+6];
// Choose the positive sum and accompanying LZA result.
assign Sm = NegSum ? NegPreSum : PreSum;
// is the result negitive
// if p - z is the Sum negitive
// if -p + z is the Sum positive
// if -p - z then the Sum is negitive
assign Ss = NegSum^Ps; //*** move to execute stage
assign Ss = NegSum^Ps;
assign Se = KillProd ? {2'b0, Ze} : Pe;
endmodule