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46 Commits

Author SHA1 Message Date
Marcelina Kościelnicka 50d532f01c techmap/shift_shiftx: Remove the "shiftx2mux" special path. 
Our techmap rules for $shift and $shiftx cells contained a special path
that aimed to decompose the shift LSB-first instead of MSB-first in
select cases that come up in pmux lowering.  This path was needlessly
overcomplicated and contained bugs.

Instead of doing that, just switch over the main path to iterate
LSB-first (except for the specially-handled MSB for signed shifts
and overflow handling).  This also makes the code consistent with
shl/shr/sshl/sshr cells, which are already decomposed LSB-first.

Fixes #2346.
 2020-08-20 12:44:09 +02:00
Xiretza 928fd40c2e Respect \A_SIGNED for $shift 
This reflects the behaviour of $shr/$shl, which sign-extend their A
operands to the size of their output, then do a logical shift (shift in
0-bits).
 2020-08-18 19:36:24 +02:00
Marcelina Kościelnicka 832acc8648 Add new FF types to simplemap. 2020-06-23 15:40:02 +02:00
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
Marcelina Kościelnicka aee439360b Add force_downto and force_upto wire attributes. 
Fixes #2058.
 2020-05-19 01:42:40 +02:00
Eddie Hung 004999218f techlibs/common: more robustness when *_WIDTH = 0 2020-05-05 08:01:27 -07:00
Eddie Hung affae35847 techmap: fix shiftx2mux decomposition 2020-02-07 11:02:48 -08:00
Eddie Hung 4c1d3a126d shiftx2mux: fix select out of bounds 2020-02-05 16:41:09 -08:00
Eddie Hung 72e4540ca9 Explicitly create separate $mux cells 2020-01-21 16:49:34 -08:00
Eddie Hung 152dfd3dd4 Fix tests -- when Y_WIDTH is non-pow-2 2020-01-21 15:19:41 -08:00
Eddie Hung 8d1b736c4f Move from +/shiftx2mux.v into +/techmap.v; cleanup 2020-01-21 15:19:41 -08:00
Clifford Wolf 8ebba8a35f Added $ff and $_FF_ cell types 2016-10-12 01:18:39 +02:00
Clifford Wolf 95757efb25 Improved support for $sop cells 2016-06-17 16:31:16 +02:00
Clifford Wolf 1d0f0d668a Renamed opt_const to opt_expr 2016-03-31 08:46:56 +02:00
Clifford Wolf ff50bc2ac3 Added $tribuf and $_TBUF_ cell types 2015-08-16 12:54:52 +02:00
Larry Doolittle 6c00704a5e Another block of spelling fixes 
Smaller this time
 2015-08-14 23:27:05 +02:00
Clifford Wolf 6c84341f22 Fixed trailing whitespaces 2015-07-02 11:14:30 +02:00
Clifford Wolf 794d22969d Added simplemap $lut support 2015-04-27 10:16:07 +02:00
Clifford Wolf 4aa9fbbf3f Improvements in simplemap api, added $ne $nex $eq $eqx support 2014-12-24 10:49:24 +01:00
Clifford Wolf 72f500c950 Removed UTF-8 chars from techmap.v 2014-12-12 12:44:16 +01:00
Clifford Wolf f1764b4fe9 Added $dffe cell type 2014-12-08 10:50:19 +01:00
Clifford Wolf 923bbbeaf0 Using alumacc in techmap.v 2014-09-14 14:50:15 +02:00
Clifford Wolf af0c8873bb Added $lcu cell type 2014-09-08 13:31:04 +02:00
Clifford Wolf d46bac3305 Added "$fa" cell type 2014-09-08 12:15:39 +02:00
Clifford Wolf dd887cc025 Using maccmap for $macc and $mul techmap 2014-09-07 18:24:08 +02:00
Clifford Wolf 9329a76818 Various bug fixes (related to $macc model testing) 2014-09-06 20:30:46 +02:00
Clifford Wolf fa64942018 Added $macc SAT model 2014-09-06 19:44:11 +02:00
Clifford Wolf bff4706b62 Added $macc simlib model (also use as techmap rule for now) 2014-09-06 17:59:12 +02:00
Clifford Wolf 8927aa6148 Removed $bu0 cell type 2014-09-04 02:07:52 +02:00
Clifford Wolf 8649b57b6f Added $lut support in test_cell, techmap, satgen 2014-08-31 17:43:31 +02:00
Clifford Wolf 4724d94fbc Added $alu cell type 2014-08-30 18:59:05 +02:00
Clifford Wolf eb571cba6a Replaced $__alu CO/CS outputs with full-width CO output 2014-08-30 15:12:39 +02:00
Clifford Wolf a92a68ce52 Using "via_celltype" in $mul carry-save-acc implementation 2014-08-18 14:30:20 +02:00
Clifford Wolf 6f33fc3e87 Performance fix for new $__lcu techmap rule 2014-08-18 00:27:54 +02:00
Clifford Wolf 4b3834e0cc Replaced recursive lcu scheme with bk adder 2014-08-18 00:03:33 +02:00
Clifford Wolf 976bda7102 Multiply using a carry-save accumulator 2014-08-16 21:07:29 +02:00
Clifford Wolf 1ddf150c35 Changes in techmap $__alu interface 2014-08-16 16:01:58 +02:00
Clifford Wolf f092b50148 Renamed $_INV_ cell type to $_NOT_ 2014-08-15 14:11:40 +02:00
Clifford Wolf 5602cbde9f Simplified $__arraymul techmap rule 2014-08-14 20:53:21 +02:00
Clifford Wolf 13f2f36884 RIP $safe_pmux 2014-08-14 11:39:46 +02:00
Clifford Wolf 7e758d5fbb Added techmap support for actual lookahead carry unit 2014-08-13 18:40:57 +02:00
Clifford Wolf 9a065509ac Preparations for lookahead ALU support in techmap.v 2014-08-13 16:36:30 +02:00
Clifford Wolf c27120fcbc New interface for $__alu in techmap.v 2014-08-13 13:04:28 +02:00
Clifford Wolf 014a41fcf3 Implemented recursive techmap 2014-08-03 12:40:43 +02:00
Clifford Wolf 1202f7aa4b Renamed "stdcells.v" to "techmap.v" 2014-07-31 02:32:00 +02:00