Cheri-research/Toooba
1
0
Fork 0
Code Issues 1 Pull Requests Actions Packages Projects Releases Wiki Activity

Avoid divide-by-zero in simulation model

Browse Source
This commit is contained in:
James Clarke
2020-01-04 05:12:16 +00:00
parent 6927e6bab1
commit 7b6c1e655b
1 changed files with 8 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
src_Core/RISCY_OOO/fpgautils/lib/XilinxIntDiv.bsv
View File

@@ -76,10 +76,15 @@ module mkIntDivUnsignedSim(IntDivUnsignedImport);
let {dividend, user} = dividendQ.first;
let divisor = divisorQ.first;
// Be careful to avoid divide-by-zero in bluesim's C++, which turns
// res = cond ? exp1 : exp2
// into
// tmp1 = exp1; tmp2 = exp2; res = cond ? tmp1 : tmp2
// so we must give a fake non-zero input even if it looks unused.
UInt#(64) a = unpack(dividend);
UInt#(64) b = unpack(divisor);
Bit#(64) q = pack(a / b);
Bit#(64) r = pack(a % b);
UInt#(64) b = divisor == 0 ? 1 : unpack(divisor);
Bit#(64) q = divisor == 0 ? maxBound : pack(a / b);
Bit#(64) r = divisor == 0 ? dividend : pack(a % b);
respQ.enq(tuple2({q, r}, user));
endrule