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98 Commits

Author SHA1 Message Date
Marcelina Kościelnicka fd79217763 Add v2 memory cells. 2021-08-11 13:34:10 +02:00
Marcelina Kościelnicka 436d42c00c opt_expr: Propagate constants to port connections. 
This adds one simple piece of functionality to opt_expr: when a cell
port is connected to a fully-constant signal (as determined by sigmap),
the port is reconnected directly to the constant value.  This is just
enough optimization to fix the "non-constant $meminit input" problem
without requiring a full opt_clean or a separate pass.
 2021-07-27 20:44:26 +02:00
Marcelina Kościelnicka 1667ad658b opt_expr: Fix mul/div/mod by POT patterns to support >= 32 bits. 
The previous code, in addition to being needlessly limitted to 32 bits
in the first place, also had UB for the 31th bit (doing 1 << 31).
 2021-06-09 19:53:44 +02:00
Marcelina Kościelnicka 12b3a9765d opt_expr: Optimize div/mod by const 1. 
Turns out the code for div by a power of 2 is already almost capable of
optimizing this to a shift-by-0 or and-with-0, which will be further
folded into nothingness; let's beef it up to handle div by 1 as well.

Fixes #2820.
 2021-06-09 17:42:30 +02:00
Claire Xenia Wolf 72787f52fc Fixing old e-mail addresses and deadnames 
s/((Claire|Xen|Xenia|Clifford)\s+)+(Wolf|Xen)\s+<(claire|clifford)@(symbioticeda.com|clifford.at|yosyshq.com)>/Claire Xenia Wolf <claire@yosyshq.com>/gi;
s/((Nina|Nak|N\.)\s+)+Engelhardt\s+<nak@(symbioticeda.com|yosyshq.com)>/N. Engelhardt <nak@yosyshq.com>/gi;
s/((David)\s+)+Shah\s+<(dave|david)@(symbioticeda.com|yosyshq.com|ds0.me)>/David Shah <dave@ds0.me>/gi;
s/((Miodrag)\s+)+Milanovic\s+<(miodrag|micko)@(symbioticeda.com|yosyshq.com)>/Miodrag Milanovic <micko@yosyshq.com>/gi;
s,https?://www.clifford.at/yosys/,http://yosyshq.net/yosys/,g;
 2021-06-08 00:39:36 +02:00
Marcelina Kościelnicka 6cd135a5eb opt_expr: Remove -clkinv option, make it the default. 
Adds -noclkinv option just in case the old behavior was actually useful
to someone.
 2020-07-31 00:08:15 +02:00
Marcelina Kościelnicka dc18bf1969 opt_expr: Fix handling of $_XNOR_ cells with A = B. 
Fixes #2311.
 2020-07-29 12:41:43 +02:00
Marcelina Kościelnicka 7afcb72c98 opt_expr: Fix crash on $mul optimization with more zeros removed than Y has. 
Fixes #2221.
 2020-07-05 06:31:58 +02:00
clairexen c7d71f436d
Merge pull request #2168 from whitequark/assert-unused-exprs 
Use (and ignore) the expression provided to log_assert in NDEBUG builds
 2020-06-25 18:21:51 +02:00
Marcelina Kościelnicka 119f79d8b9 Add support for new FF types in some opt passes. 2020-06-23 15:40:02 +02:00
whitequark 118e4caa37 Remove YS_ATTRIBUTE(unused) where present just for log_assert()/log_debug(). 2020-06-19 15:48:58 +00:00
whitequark 7191dd16f9 Use C++11 final/override keywords. 2020-06-18 23:34:52 +00:00
Xiretza edd8ff2c07
Add flooring division operator 
The $div and $mod cells use truncating division semantics (rounding
towards 0), as defined by e.g. Verilog. Another rounding mode, flooring
(rounding towards negative infinity), can be used in e.g. VHDL. The
new $divfloor cell provides this flooring division.

This commit also fixes the handling of $div in opt_expr, which was
previously optimized as if it was $divfloor.
 2020-05-28 22:59:04 +02:00
Xiretza 17163cf43a
Add flooring modulo operator 
The $div and $mod cells use truncating division semantics (rounding
towards 0), as defined by e.g. Verilog. Another rounding mode, flooring
(rounding towards negative infinity), can be used in e.g. VHDL. The
new $modfloor cell provides this flooring modulo (also known as "remainder"
in several languages, but this name is ambiguous).

This commit also fixes the handling of $mod in opt_expr, which was
previously optimized as if it was $modfloor.
 2020-05-28 22:59:03 +02:00
Eddie Hung 7b3a4a1fff opt_expr: Sx to Sz; spotted by @Xiretza 2020-05-14 12:14:23 -07:00
Eddie Hung 73b7ea713c
Merge pull request #1994 from YosysHQ/eddie/fix_bug1758 
opt_expr: improve single-bit $and/$or/$xor/$xnor cells; gate cells too
 2020-05-14 11:56:22 -07:00
Eddie Hung cd92a706ae Fix whitespace 2020-05-14 09:51:17 -07:00
Eddie Hung 9694dc42dd opt_expr: consume_x to require/imply !keepdc 2020-05-08 11:12:43 -07:00
Eddie Hung 17f4e06247 opt_expr: restore consume_x; use for coarse grained too 2020-05-08 11:07:44 -07:00
Claire Wolf 2285cf1219 Fix the other "opt_expr -fine" bug introduced in 213a89558 
Signed-off-by: Claire Wolf <claire@symbioticeda.com>
 2020-05-02 21:50:43 +02:00
Claire Wolf 8ee32adac3 Fix "opt_expr -fine" bug introduced in 213a89558 
Signed-off-by: Claire Wolf <claire@symbioticeda.com>
 2020-05-01 20:12:16 +02:00
Eddie Hung b5f38f8342 opt_expr: const_xnor replacement to pad Y with 1'b1 2020-04-24 14:13:45 -07:00
Eddie Hung 83570bc0da opt_expr: more fixes for $xor/$xnor 2020-04-24 11:15:29 -07:00
Eddie Hung 90b71eb84b opt_expr: do not group by X, more fixes 2020-04-23 18:15:07 -07:00
Eddie Hung e7058593f4 opt_expr: improve single-bit $and/$or/$xor/$xnor cells; gate cells too 2020-04-23 15:57:48 -07:00
Marcelina Kościelnicka 2f8541a92e opt_expr: Fix X and CO outputs for $alu identity-mapping rules. 2020-04-16 11:48:29 +02:00
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
Marcelina Kościelnicka 840bb17089 opt_expr: Optimize multiplications with low 0 bits in operands. 
Fixes #1500.
 2020-04-13 16:52:22 +02:00
Eddie Hung 956ecd48f7 kernel: big fat patch to use more ID::*, otherwise ID(*) 2020-04-02 09:51:32 -07:00
Eddie Hung 37f42fe102
Merge pull request #1845 from YosysHQ/eddie/kernel_speedup 
kernel: speedup by using more pass-by-const-ref
 2020-04-02 07:13:33 -07:00
Eddie Hung c90324662c
Merge pull request #1828 from YosysHQ/eddie/celltypes_speedup 
kernel: share a single CellTypes within a pass
 2020-04-01 14:17:45 -07:00
Eddie Hung 4ae7f3a8ed
Merge pull request #1790 from YosysHQ/eddie/opt_expr_xor 
opt_expr: optimise $xor/$xnor/$_XOR_/$_XNOR_ -s with constant inputs
 2020-04-01 14:17:01 -07:00
Eddie Hung 4d897975a8 Code review fixes 2020-03-30 08:22:46 -07:00
Eddie Hung 0c0dc4ffc3 opt_expr: fix failing $xnor test 2020-03-20 14:39:08 -07:00
Eddie Hung af16ca9dd4 opt_expr: fix missing brace 2020-03-20 09:17:53 -07:00
Eddie Hung 01f9aabc2f opt_expr: extend to $xnor and $_XNOR_ 2020-03-19 16:56:39 -07:00
Eddie Hung ee5995641e opt_expr: optimise 1-bit $xor or $_XOR_ with constant input 2020-03-19 16:33:54 -07:00
Eddie Hung 8d1fa0e3b9 opt_expr: remove redundant 2020-03-19 14:34:27 -07:00
Eddie Hung 213a895589 opt_expr: optimise $sub when both A[i] and B[i] == 1'b1 2020-03-19 14:34:10 -07:00
Eddie Hung a8e5d0c402 opt_expr: optimise for identity $alu-s just like $add/$sub 2020-03-19 14:24:55 -07:00
Eddie Hung 7ad7f41bc5 kernel: share a single CellTypes within a pass 2020-03-18 12:21:40 -07:00
Eddie Hung 432a09af80 kernel: SigSpec use more const& + overloads to prevent implicit SigSpec 2020-03-13 08:17:39 -07:00
Alyssa Milburn e709fd3da1 Fix opt_expr.eqneq.cmpzero debug print 2019-12-15 20:40:38 +01:00
Clifford Wolf a67d63714b Fix handling of z_digit "?" and fix optimization of cmp with "z" 
Signed-off-by: Clifford Wolf <clifford@clifford.at>
 2019-09-13 13:39:39 +02:00
Eddie Hung 9245f0d3f5 Copy-paste typo 2019-08-22 08:43:44 -07:00
Eddie Hung 6f971470f8 Respect opt_expr -keepdc as per @cliffordwolf 2019-08-22 08:37:27 -07:00
Eddie Hung 379f33af54 Handle $shift and Y_WIDTH > 1 as per @cliffordwolf 2019-08-22 08:22:23 -07:00
Eddie Hung 9e31f01b34 Add cover() 2019-08-22 08:06:24 -07:00
Eddie Hung d0ffe7544c Canonical form 2019-08-22 08:05:01 -07:00
Eddie Hung d3a212ff91 opt_expr to trim A port of $shiftx if Y_WIDTH == 1 2019-08-21 21:53:55 -07:00