- Remove redundant casting
- Cheaper final XOR parity flip (~/^1 instead of != 0)
- Support XOR reduction of ~XOR nodes
- Don't add redundant masking of terms
- Support unmasked terms
- Add cheaper implementation for single bit only terms
- Ensure result is clean under all circumstances (this fixes current bugs)
* Add a test to reproduce #3023. Also applied verilog-mode formatting.
* use unique_ptr. No functional change is intended.
* Introduce restorer that reverts changes during iterate() if failed.
AND(CONST,SHIFTR(_,C)) appears often after V3Expand, with C a large
enough dense mask (i.e.: of the form (1 << n) - 1) to make the masking
redundant. E.g.: 0xff & ((uint32_t)a >> 24). V3Const now replaces these
ANDs with the SHIFTR node.
Similarly, we also simplify the same with SHIFTL,
e.g.: 0xff000000 & ((uint32_t)a << 24)
V3Expand generates a lot of OR nodes that are under a clearing mask, and
have redundant terms, e.g.: 0xff & (a << 8 | b >> 24). The 'a << 8' term
in there is redundant as it's bottom bits are all zero where the mask is
non-zero. V3Const now removes these redundant terms.
* Tests: Add more case that does not match native C++ width (8, 16, 32 or 64).
* Use AstVarRef::same() instead of AstNode::sameGateTree() because the latter checks dtype in addition to scope.
AstVarRef may have different minWidth in some cases,
but the difference should be ignored in the context of bitOpTree optimization.
* Tests: Add another testcase that triggers assertion failure in bitOpTree opt.
* Fix assertion failure in bitOpTree opt reported in #2891. Consider the follwoing case.
CCast -> WordSel -> VarRef(leaf)
* Make sure that m_bitPolarity is expanded enough.
The intention was to not merge impure assignments, but the actual
predicate failed if the assignment was indeed pure.
This fix gains 1.5% speed on SweRV EH1.
* Tests:Add some more signals to t_const_opt_red.v
* Optimize bit op trees such as ~a[2] & a[1] & ~a[0] to 3'b010 == (3'111 & a)
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Apply clang-format
* Don't edit and-or tree.
* Call matchBitOpTree() after V3Expand does its job.
* Internals: Rename newNodep -> newp. No functional change is intended.
* Internals: Remove m_sels. No functional change is intended.
* Internals: Remove stringstream. No functional change is intended.
* Internals: Use V3Number::bitIs1(). No functional change is intended.
* Internals: Use V3Number instead of std::map. Resolved laek. Result should be same.
* Internals: Resolve overload of setPolarity. No functional change is intended.
* Internals: Pass failure reason. No functional change is intended.
* Internals: Add VNUser::toPtr(). No functional change is intended.
* Internals: Use user4 instead of std::map. No functional change is intended.
* Catch up with the AST style aftre V3Expand
* Internals: Rename Context to VarInfo. No functional change is intended.
* Add some more test case
* tests:Add stats to tests
Update stats in t_merge_cond.pl as matchBitopTree does some of them.
* insert CCast if necessary
* small optimization to remove redundant bit mask
* No quick exit even when unoptimizable node is found.
* Simplify removing redundant And
* simplify
* Revert "Internals: Add VNUser::toPtr(). No functional change is intended."
This reverts commit f98dce10db.
* Consider AstWordSel and cleanup
* Update test
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Update src/V3Const.cpp
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
* Apply clang-format
* Internals: rename variables. No functional change is intended.
Co-authored-by: Wilson Snyder <wsnyder@wsnyder.org>
Co-authored-by: github action <action@example.com>
Wilson Snyder
github action
Zhanglei Wang
Geza Lore
Yutetsu TAKATSUKASA