luke
/
verilator
mirror of https://github.com/verilator/verilator.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
verilator/test_regress/t/t_debug_width.out

5 lines
406 B
Plaintext
Raw Normal View History

Optimize Ast read references in Dfg directly (#7354) Introduce a new DfgAstRd vertex, which holds an AstNodeExpr that is a reference to a variable. This enables tracking all read references in Dfg, which both enables more optimization, and allows inlining of expressions in place of the reference more intelligently (e.g, when the expression is only used once, and is not in a loop). This can get rid of 20-30% of temporary variables introduced in Dfg in some designs. Note V3Gate later got rid of a lot of those, this is a step towards making V3Gate redundant. The more intelligent expression inlining is worth ~10% runtime speed on some designs.
2026-04-01 11:52:56 +02:00
%Error: Internal Error: t/t_opt_const.v:142:26: ../V3Ast.cpp:#: widthMismatch detected 'lhsp()->widthMin() != rhsp()->widthMin()' @ ../V3AstNodes.cpp:#OUT:(G/wu32/5) LHS:(G/w32) RHS:(G/wu32/5)
142 | bug3182 i_bug3182(.in(d[4:0]), .out(bug3182_out));
| ^
Change error messages to more often suggest documentation
2025-04-05 23:10:28 +02:00
... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.