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Divider constant cleanup, made CORRSHIFTSZ consistent

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This commit is contained in:
David Harris 2023-01-09 12:34:19 -08:00
parent 302a2e0116
commit 48f31d4b24
1 changed files with 2 additions and 3 deletions
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5
pipelined/config/shared/wally-constants.vh
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@ -125,17 +125,16 @@
`define LOGCVTLEN $unsigned($clog2(`CVTLEN+1))
`define NORMSHIFTSZ ((`QLEN+`NF+1) > (3*`NF+6) ? (`QLEN+`NF+1) : (3*`NF+6))
`define LOGNORMSHIFTSZ ($clog2(`NORMSHIFTSZ))
`define CORRSHIFTSZ ((`DIVRESLEN+`NF) > (3*`NF+6) ? (`DIVRESLEN+`NF) : (3*`NF+4))
`define CORRSHIFTSZ ((`DIVN+1+`NF) > (3*`NF+4) ? (`DIVN+1+`NF) : (3*`NF+4))
// division constants
`define DIVN (`NF<`XLEN ? `XLEN : `NF+3) // standard length of input
`define DIVRESLEN (`NF<`XLEN ? `XLEN : `NF+4) // result length for postprocessing
`define LOGR (`RADIX==2 ? 32'h1 : 32'h2) // r = log(R)
`define RK (`LOGR*`DIVCOPIES) // r*k used for intdiv preproc
`define LOGRK ($clog2(`RK)) // log2(r*k)
`define FPDUR ((`DIVN+1+(`LOGR*`DIVCOPIES))/(`LOGR*`DIVCOPIES)+(`RADIX/4))
`define DURLEN ($clog2(`FPDUR+1))
`define QLEN (`FPDUR*`LOGR*`DIVCOPIES)
`define DIVb (`FPDUR*`LOGR*`DIVCOPIES-1) // canonical fdiv size
`define DIVb (`FPDUR*`LOGR*`DIVCOPIES-1) // canonical fdiv size (b)
`define DIVBLEN ($clog2(`DIVb+1)-1)
`define DIVa (`DIVb+1-`XLEN) // used for idiv on fpu