config file, comment, postproc cleanup

pipelined/config/shared/wally-shared.vh

@@ -26,8 +26,6 @@
 `include "wally-constants.vh"
 
 // macros to define supported modes
-// NOTE: No hardware support for Q yet
-
 `define A_SUPPORTED ((`MISA >> 0) % 2 == 1)
 `define C_SUPPORTED ((`MISA >> 2) % 2 == 1)
 `define D_SUPPORTED ((`MISA >> 3) % 2 == 1)
@@ -38,11 +36,7 @@
 `define Q_SUPPORTED ((`MISA >> 16) % 2 == 1)
 `define S_SUPPORTED ((`MISA >> 18) % 2 == 1)
 `define U_SUPPORTED ((`MISA >> 20) % 2 == 1)
-
 // N-mode user-level interrupts are depricated per Andrew Waterman 1/13/21
-//`define N_SUPPORTED ((MISA >> 13) % 2 == 1)
-`define N_SUPPORTED 0
-
 
 // logarithm of XLEN, used for number of index bits to select
 `define LOG_XLEN (`XLEN == 32 ? 5 : 6)
@@ -108,30 +102,6 @@
 `define LOGNORMSHIFTSZ ($clog2(`NORMSHIFTSZ))
 `define CORRSHIFTSZ ((`DIVRESLEN+`NF) > (3*`NF+6) ? (`DIVRESLEN+`NF) : (3*`NF+4))
 
-/*
-// division constants
-`define RADIX 32'h4
-`define DIVCOPIES 32'h4
-`define DIVLEN ((`NF < `XLEN) ? (`XLEN) : `NF+3)
-// `define DIVN (`NF < `XLEN ? `XLEN : `NF+1) // length of input
-`define DIVN (`NF<`XLEN ? `XLEN : (`NF + 3)) // length of input
-`define EXTRAFRACBITS ((`NF < (`XLEN)) ? (`XLEN - `NF) : 3)
-`define EXTRAINTBITS ((`NF < `XLEN) ? 0 : (`NF - `XLEN + 3))
-`define DIVRESLEN ((`NF>`XLEN) ? (`NF + 4) : `XLEN)
-`define LOGR ((`RADIX==2) ? 32'h1 : 32'h2)
-`define RK (`DIVCOPIES*`LOGR) // r*k used for intdiv preproc
-`define LOGK ($clog2(`DIVCOPIES))
-`define LOGRK ($clog2(`RK)) // log2(r*k)
-// FPDUR = ceil(DIVRESLEN/(LOGR*DIVCOPIES)) 
-// one iteration is required for the integer bit for minimally redundent radix-4
-`define FPDUR ((`DIVN+1+(`LOGR*`DIVCOPIES))/(`LOGR*`DIVCOPIES)+(`RADIX/4))
-`define DURLEN ($clog2(`FPDUR+1))
-`define QLEN (`FPDUR*`LOGR*`DIVCOPIES)
-`define DIVb (`QLEN-1)
-`define DIVa (`DIVb+1-`XLEN)
-`define DIVBLEN ($clog2(`DIVb+1)-1)
-*/
-
 // division constants
 `define RADIX       32'h4
 `define DIVCOPIES   32'h4
@@ -147,7 +117,6 @@
 `define DIVBLEN     ($clog2(`DIVb+1)-1)
 `define DIVa        (`DIVb+1-`XLEN)             // used for idiv on fpu
 
-
 `define USE_SRAM 0
 
 // Disable spurious Verilator warnings

pipelined/src/fpu/fdivsqrt/fdivsqrt.sv

@@ -44,16 +44,14 @@ module fdivsqrt(
   input  logic StallM,
   input  logic FlushE,
   input  logic SqrtE, SqrtM,
-	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 MDUE, W64E,
   output logic DivSM,
   output logic FDivBusyE, IFDivStartE, FDivDoneE,
-//  output logic DivDone,
   output logic [`NE+1:0] QeM,
   output logic [`DIVb:0] QmM,
   output logic [`XLEN-1:0] FPIntDivResultM
-//   output logic [`XLEN-1:0] RemM,
 );
 
   // Floating-point division and square root module, with optional integer division and remainder

pipelined/src/fpu/fdivsqrt/fdivsqrtfgen2.sv

@@ -37,15 +37,15 @@ module fdivsqrtfgen2 (
   output logic [`DIVb+3:0] F
 );
   logic [`DIVb+3:0] FP, FN, FZ;
-  logic [`DIVb+3:0] SExt, SMExt, CExt;
+  logic [`DIVb+3:0] UExt, UMExt, CExt;
 
-  assign SExt  = {3'b0, U};
+  assign UExt  = {3'b0, U};
-  assign SMExt = {3'b0, UM};
+  assign UMExt = {3'b0, UM};
   assign CExt  = {2'b11, C}; // extend C from Q2.k to Q4.k
 
   // Generate for both positive and negative bits
-  assign FP = ~(SExt << 1) & CExt;
+  assign FP = ~(UExt << 1) & CExt;
-  assign FN = (SMExt << 1) | (CExt & ~(CExt << 2));
+  assign FN = (UMExt << 1) | (CExt & ~(CExt << 2));
   assign FZ = '0;
 
   // Choose which adder input will be used
@@ -54,5 +54,4 @@ module fdivsqrtfgen2 (
     if (up)       F = FP;
     else if (uz)  F = FZ;
     else          F = FN;
-
 endmodule

pipelined/src/fpu/fdivsqrt/fdivsqrtpostproc.sv

@@ -121,13 +121,14 @@ module fdivsqrtpostproc(
       end else begin
         logic [`DIVb+3:0] PreIntQuotM;
         if (WZeroM) begin
-          if (weq0M) begin
+          PreIntQuotM = weq0M ? {3'b000, FirstU} :  {3'b000, FirstUM};
+          IntRemM  = '0;
+   /*        if (weq0M) begin
             PreIntQuotM = {3'b000, FirstU};
-            IntRemM  = '0;
+         end else begin
-          end else begin
             PreIntQuotM = {3'b000, FirstUM};
             IntRemM  = '0;
-          end 
+          end  */
         end else begin 
           PreIntQuotM = {3'b000, PreQmM};
           IntRemM  = NormRemM;