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60eab3eb8c
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Author SHA1 Message Date
Yutetsu TAKATSUKASA
60eab3eb8c
Fix wrong result of bit op tree optimization #3509 (#3516) 
* Tests: Add a test to reproduce #3509

* Tests: Compile without tautological-compare check because bit op tree optimization is disabled in the test.

* Internals: Dedup code. No functional change is intended.

* Fix #3509.

"2'b10 == (2'b11 & {1'b0, val[0]})"  and "2'b10 != (2'b11 & {1'b0, val[0]})" were
wrongly optimized to "!val[0]" and "val[0]" respectively.
Now properly optimize them to 1'b0 and 1'b1.

* Commentary

* Commentary: Update Changes
 2022-07-24 19:54:37 +09:00
Wilson Snyder
ada58465b2 Add -f<optimization> options to replace -O<letter> options (#3436). 2022-06-03 20:43:16 -04:00
Yutetsu TAKATSUKASA
b08c694cd6
Fix wrong bit op tree optimization (#3185) 
* Add a test to reproduce bug3182. Run the same HDL with -Oo to confirm the result is same.

* Hopefully fix #3182. The result can be 0 only when polarity is true (no AstNot is found during traversal).
 2021-11-06 12:31:50 +09:00