15 Commits

Author	SHA1	Message	Date
Clifford Wolf	649bb9374f	Add "opt_expr -fine" feature to remove neutral bits from reduce and logic operators	2017-07-26 18:28:55 +02:00
Clifford Wolf	0a02cdb93b	Fix and_or_buffer optimization in opt_expr for signed operators	2017-07-01 16:05:26 +02:00
Larry Doolittle	2021ddecb3	Squelch trailing whitespace	2017-04-12 15:11:09 +02:00
Clifford Wolf	95dae6d416	Fixed some "used uninitialized" warnings in opt_expr	2017-02-11 10:50:48 +01:00
Clifford Wolf	a5bfeb9e07	Add optimization of (a && 1'b1) and (a || 1'b0)	2017-02-11 10:05:00 +01:00
C-Elegans	94b272077d	Fix issue #306, "Bug in opt -full" ... Add check for whether the high bit in the constant expression is greater than the width of the variable, and optimizes that to a constant 1 or 0	2017-02-10 10:38:02 -05:00
Clifford Wolf	ffbe8d41f3	Fix indenting and log messages in code merged from opt_compare_pr	2017-01-31 16:20:56 +01:00
C-Elegans	a94c3694d7	Refactor and generalize the comparision optimization ... Generalizes the optimization to: a < C, a >= C, C > a, C <= a	2017-01-30 17:52:16 -05:00
C-Elegans	2fa0fd4a37	Do not use b.as_int() in calculation of bit set	2017-01-21 12:58:26 -05:00
C-Elegans	84f9cd0025	Optimize compares to powers of 2 ... Remove opt_compare and put comparison pass in opt_expr assuming a [7:0] is unsigned a >= (1<<x) becomes |a[7:x] a < (1<<x) becomes !a[7:x] Additionally: a >= 0 becomes constant true, a < 0 becomes constant false delete opt_compare.cc revert opt.cc to commit b7cfb7dbd (remove opt_compare step)	2017-01-16 13:45:50 -05:00
Clifford Wolf	11f7b8a2a1	Added opt_expr support for div/mod by power-of-two	2016-05-29 12:17:36 +02:00
Clifford Wolf	0bc95f1e04	Added "yosys -D" feature	2016-04-21 23:28:37 +02:00
Clifford Wolf	f38ca3e18f	Improvements in opt_expr	2016-04-21 14:23:04 +02:00
Clifford Wolf	e2f6d61c00	Typo fixes in opt_expr and opt_merge	2016-03-31 09:56:56 +02:00
Clifford Wolf	1d0f0d668a	Renamed opt_const to opt_expr	2016-03-31 08:46:56 +02:00