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32 Commits

Author SHA1 Message Date
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
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
Clifford Wolf c6d8d70109 Fix mingw compile issue (2nd attempt) 2017-02-23 14:21:02 +01:00
Clifford Wolf 0822b21844 Fix mingw compile issue (maybe.. I can't test it) 2017-02-23 13:59:02 +01:00
Clifford Wolf 207736b4ee Import more std:: stuff into Yosys namespace 2015-10-25 19:30:49 +01:00
Clifford Wolf 6c84341f22 Fixed trailing whitespaces 2015-07-02 11:14:30 +02:00
Clifford Wolf 25781e329b Fixed const2big performance bug 2015-04-09 13:20:19 +02:00
Clifford Wolf 4569a747f8 Renamed SIZE() to GetSize() because of name collision on Win32 2014-10-10 17:07:24 +02:00
Clifford Wolf 8927aa6148 Removed $bu0 cell type 2014-09-04 02:07:52 +02:00
Clifford Wolf b9cb483f3e Using $pos models for $bu0 2014-09-03 21:20:59 +02:00
Clifford Wolf c38283dbd0 Small bug fixes in $not, $neg, and $shiftx models 2014-09-02 17:48:41 +02:00
Clifford Wolf 83ec3fa204 Fixed return size of const_*() eval functions 2014-08-31 18:08:26 +02:00
Clifford Wolf 1cb25c05b3 Moved some stuff to kernel/yosys.{h,cc}, using Yosys:: namespace 2014-07-31 13:19:47 +02:00
Clifford Wolf 397b00252d Added $shift and $shiftx cell types (needed for correct part select behavior) 2014-07-29 16:35:13 +02:00
Clifford Wolf 7bd2d1064f Using log_assert() instead of assert() 2014-07-28 11:27:48 +02:00
Clifford Wolf a1bfde8c5e Strictly zero-extend unsigned A-inputs of shift operations 2014-03-06 11:53:37 +01:00
Clifford Wolf c69c416d28 Added $bu0 cell (for easy correct $eq/$ne mapping) 2013-12-28 12:02:14 +01:00
Clifford Wolf ecc30255ba Added proper === and !== support in constant expressions 2013-12-27 13:50:08 +01:00
Clifford Wolf 259cc1391e More undef-propagation related fixes 2013-11-08 11:40:36 +01:00
Clifford Wolf 81b8f3292e Removed debug log from const_pow() 2013-11-08 04:43:38 +01:00
Clifford Wolf fc6dc0d7b8 Fixed handling of power operator 2013-11-07 22:20:00 +01:00
Clifford Wolf d7cb62ac96 Fixed more extend vs. extend_u0 issues 2013-11-07 19:20:20 +01:00
Clifford Wolf 8c523ef81d Improved undef handling in == and != for ConstEval 2013-11-06 22:25:35 +01:00
Clifford Wolf 6fcbc79b5c Improved width extension with regard to undef propagation 2013-11-06 21:05:11 +01:00
Clifford Wolf f839b842a2 Fixed handling of undef values in POS cells in ConstEval 2013-11-06 18:45:31 +01:00
Clifford Wolf 27fec4e77c Fixed sign handling in const eval of sshl and sshr 2013-11-05 10:22:22 +01:00
Clifford Wolf 78658199e6 Fixed signed div/mod in const eval (rounding and stuff) 2013-08-15 18:23:42 +02:00
Clifford Wolf d0e93e04d1 Added eval -brute_force_equiv_checker_x mode 2013-08-15 11:09:30 +02:00
Clifford Wolf 6d7b5f9064 Fixed even more ConstEval bugs found using xsthammer 2013-06-14 17:50:26 +02:00
Clifford Wolf a321a5c412 Moved stand-alone libs to libs/ directory and added libs/subcircuit 2013-02-27 09:32:19 +01:00
Clifford Wolf 7764d0ba1d initial import 2013-01-05 11:13:26 +01:00