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  • $floor (-4/3) yields -1 instead of -2

$floor (-4/3) yields -1 instead of -2

SystemVerilog 6745
Srini @ CVCblr.com
Srini @ CVCblr.com
Full Access
266 posts
June 02, 2023 at 12:18 pm

A related but not the same (mod) function:

module m;
 
  initial begin
    $display ("FL: 4/3 %0d", $floor(4/3));
    $display ("FL: -4/3 %f", $floor(-4/3));
  end
endmodule

Tools give me -1, whereas C/PY/Matlab give -2. As per LRM:

Quote:

Table 20-4—SystemVerilog to C real math function cross-listing

It should match C's floor. What am I missing please?

Thanks

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Solution

Solution

gsulliva
gsulliva
Full Access
25 posts
June 02, 2023 at 1:06 pm

Force Verilog to treat the function input as a "real" by using 4.0:

$display ("FL: -4/3 %f", $floor(-4.0/3));

This gives me:

Quote:

FL: -4/3 -2.000000
Srini @ CVCblr.com
Srini @ CVCblr.com
Full Access
266 posts
June 05, 2023 at 2:00 am

In reply to gsulliva:

Argh..that type-casting miss, thanks for pointing it out.

Thanks

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