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  • Empty Range if left_bound>right_bound

Empty Range if left_bound>right_bound

SystemVerilog 6877
range coverage bins empty 1
prashantg
prashantg
Full Access
35 posts
January 24, 2023 at 10:03 pm

Is it expected that bins will not be created if during range mentions left_bound>right_bound?

bins range[] = {[31:1], [63:32],[95:64],[127:96],[159:128],[191:160],[223:192],[254:224]};

I checked LRM for keywords right bound, left bound and empty range. I cannot find this restriction.

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dave_59
dave_59
Forum Moderator
11426 posts
January 24, 2023 at 11:02 pm

In reply to prashantg:

The LRM is following rules defined for a value range

section 11.4.13 wrote:
If the bound to the left of the colon is greater than the bound to the right, the range is empty and contains no values.

The proposed 1800-2023 LRM adds a cross-reference to that section to maker it clearer that covergroups are using those rules.

— Dave Rich, Verification Architect, Siemens EDA

prashantg
prashantg
Full Access
35 posts
January 24, 2023 at 11:06 pm

In reply to dave_59:

Thanks, Dave for the reference. Apparently, I was not searching correct keywords. What are the tools' expectations if they encounter such coding, Warnings, Fatal, etc?

dave_59
dave_59
Forum Moderator
11426 posts
January 24, 2023 at 11:13 pm

In reply to prashantg:

The range is empty and contains no values.

Probably merits a lint type of warning.

— Dave Rich, Verification Architect, Siemens EDA

prashantg
prashantg
Full Access
35 posts
January 24, 2023 at 11:24 pm

In reply to dave_59:

Thanks Dave.

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