yosys

Commit Graph

Author	SHA1	Message	Date
Marcelina Kościelnicka	6c16fd760b	opt_expr: Add more $alu optimizations. Detect the places in the $alu where the carry bit is constant (due to const A[i] == B[i] ^ BI) and split it into smaller $alu at these points. Also, make the existing const-carry detection for low bits more generic (now handles cases where both BI and CI are constant, but not equal to one another). Fixes #1912.	2020-04-14 21:48:13 +02:00
Eddie Hung	5e2562f1a2	opt_expr: add $alu tests	2020-03-19 14:57:10 -07:00

Author

SHA1

Message

Date

Marcelina Kościelnicka

6c16fd760b

opt_expr: Add more $alu optimizations.

Detect the places in the $alu where the carry bit is constant (due to
const A[i] == B[i] ^ BI) and split it into smaller $alu at these points.

Also, make the existing const-carry detection for low bits more generic
(now handles cases where both BI and CI are constant, but not equal to
one another).

Fixes #1912.

2020-04-14 21:48:13 +02:00

Eddie Hung

5e2562f1a2

opt_expr: add $alu tests

2020-03-19 14:57:10 -07:00

2 Commits