yosys

Commit Graph

Author	SHA1	Message	Date
Emil J	56b80bdd22	Merge pull request #4448 from georgerennie/shiftadd_gating peepopt shiftadd: Only match for sufficiently small constant widths	2024-11-20 13:34:09 +01:00
Emil J	e0d3bbf3c3	Merge pull request #4452 from phsauter/shiftadd-underflow-fix peepopt: avoid shift-amount underflow	2024-08-19 15:45:46 +02:00
Philippe Sauter	2f0f10cb87	peepopt: limit padding from shiftadd The input to a shift operation is padded. This reduced the final number of MUX cells but during techmap it can create huge temporary multiplexers in the log shifter. This significantly increases runtime and resources. A limit is added with a warning when it is used.	2024-06-14 15:33:03 +02:00
Philippe Sauter	74e504330a	peepopt: fix sign check in shiftadd	2024-06-14 13:01:18 +02:00
phsauter	34b5c6d062	peepopt: avoid shift-amount underflow	2024-06-13 23:30:07 +02:00
George Rennie	41aaaa153e	peepopt shiftadd: Only match for sufficiently small constant widths This addresses issue #4445	2024-06-12 14:38:12 +01:00
Philippe Sauter	cbdf9b2f9c	peepopt: handle empty src-attribute in shiftadd	2024-01-31 13:07:01 +01:00
Philippe Sauter	7f8b6dd982	peepopt: delete unnecessary comment in shiftadd	2024-01-30 09:51:21 +01:00
Philippe Sauter	68a9aa7c29	peepopt: handle offset too large in `shiftadd` If the offset is larger than the signal itself, meaning the signal is completely shifted out, it tried to extract a negative amount of bits from the old signal. This RTL pattern is suspicious since it is a complicated way of arriving at a constant value, so we warn the user.	2024-01-26 16:44:30 +01:00
phsauter	3618294bac	peepopt: Add assert of consistent `shiftadd` data	2023-11-06 16:35:00 +01:00
phsauter	9ca57d9f13	peepopt: fix and refactor `shiftadd` - moved all selection and filtering logic to the match block - applied less-verbose code suggestions - removed constraint on number of bits in shift-amount - added check for possible wrap-arround in the operation	2023-11-06 14:01:37 +01:00
Philippe Sauter	72c6a01e67	peepopt: Add initial `shiftadd` pattern	2023-11-06 14:01:37 +01:00

12 Commits