72019959a8
Translate some ternary expressions to if statements
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This re-implements some earlier functionality where
ternary expressions on an assignment RHS are translated
to an if statement.
2008-08-03 15:47:32 +01:00
c1b5424ca6
Implement assignment with multiple lvals
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Multiple lvals are implemented by first assigning the complete
RHS to a temporary, and then assigning each lval in turn as
bit-selects of the temporary
2008-08-02 18:40:24 +01:00
c706c94e38
Generate a vhdl_var_ref for every assignment lval
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This completes the refactoring of make_assignment
necessary to implement multiple lvals.
2008-08-02 18:20:18 +01:00
fad8abee34
Start refactoring make_assignment for multiple lvals
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This patch lifts the RHS generating code out of the
lval-specific code and sticks a loop around the lvals.
2008-08-02 16:38:44 +01:00
9448c5939c
Always user Ternary_* support functions for ternary assignments
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Previously the code generator expanded ternary assignments to
and `if' statement. This patch replaces that with a single assignment
and a call to a Ternary_* support function. This will make it
much easier to support multiple lvals later.
2008-08-02 15:46:36 +01:00
8b32096e2a
Convert std_logic to Boolean in loop tests
2008-07-27 18:39:16 +01:00
39c9c54760
Add repeat statement
2008-07-24 14:52:06 +01:00
8bee5b1108
Add `forever' statement type
2008-07-24 14:30:10 +01:00
e4c2400eb2
Refactor the expression->time code into a single function
2008-07-23 16:18:49 +01:00
7b311b6adb
Translate internal delays in assignments
2008-07-18 14:47:35 +01:00
e9637f6d11
Generate synthesisable code for sequential processes
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Whilst adding `wait until ...' at the end of every
process is a valid translation of the input, it is not
actually synthesisable in at least one commercial
synthesiser (XST). According to the XST manual the
correct template is to use `wait until ...' at the
start of sequential processes and `wait on ...'
(equivalent to `wait until ...' with 'Event on all
the signals) at the end of combinatorial processes.
This patch implements that.
2008-07-17 17:36:42 +01:00
1f9ed2c5ec
VHDL AST element for `wait on' statement
2008-07-17 17:23:21 +01:00
2a791bfb38
Assignment to arrays
2008-07-17 13:41:44 +01:00
be67cae29f
Add translation for IVL_ST_CASEX
2008-07-16 16:42:44 +01:00
4504c2bceb
Fix initialisation order bug with `if' statements
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If an assignment appears inside an if statement branch
it could be incorrectly used as the signal's initial
value.
2008-07-16 12:11:00 +01:00
b5e12077b2
Fix assignment to lval slice
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It was broken in yeserday's refactoring
2008-07-15 18:40:30 +01:00
a9c98ad5f2
Handle `if' with empty cond_true part
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Fixes assertion failure with following statement:
if (foo)
begin
end
else
...
2008-07-15 14:26:19 +01:00
b8e758edf0
Refactor LPM code
2008-07-15 14:09:24 +01:00
0b48f69b4e
Tidy up blocking assignment code
2008-07-15 10:44:48 +01:00
d1e7e325b7
Remove redundant edge_detector function
2008-07-14 21:34:48 +01:00
75b1db0add
Fix assignment with ternary RHS
...
This was also broken in the last commit
2008-07-14 21:27:21 +01:00
6e965523a1
Fix PV assignment (was broken in last commit)
2008-07-14 21:09:19 +01:00
8589c0691b
Refactor assignment code
2008-07-14 21:04:09 +01:00
99ef8ec4f1
Simplify edge detector code
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Now generates a `wait until' statement rather than a
sensitivity list.
2008-07-14 20:29:49 +01:00
d22c9a8b05
Simplify blocking assignment
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Now generates 'wait for 0 ns' after non-blocking assignment
2008-07-14 19:54:45 +01:00
4777966b4c
Bit select bug fixes
2008-07-07 21:19:59 +01:00
0348664512
Correctly determine VHDL type of LHS of part select
2008-07-07 16:35:39 +01:00
b0de1a8d7e
Implement part select for LHS of assignment
2008-07-07 16:11:45 +01:00
bdf5ee7ab7
Concat LPM
2008-07-07 14:48:57 +01:00
ebaa4c7d5d
Implement assignment to part select properly
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Previously the base of the lval was ignored, this ensures
the correct assignment is generated.
2008-07-07 11:00:27 +01:00
85d2cc78d6
Finish ternary operator expansion
2008-07-06 17:56:48 +01:00
18071562ba
Partially implement ternary expressions
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This handles the case where the expression appears as the
right hand side of an assignment. The expression is converted
into a regular if statement.
2008-07-04 21:55:51 +01:00
5aeff6d47d
Merge blocking and non-blocking assignment code
2008-07-04 20:07:38 +01:00
19871efd5a
Fix bug where sensitivity might reference undefined signals
2008-07-04 11:58:33 +01:00
409fc4dc19
Check if case expression variable is already defined
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Verilog_Case_Ex is used as a temporary to store the result of
any non-static case expression. This fixes a bug where it would
be declared multiple times if there were multiple case statements
in a block.
2008-07-04 11:15:34 +01:00
c54b36c902
Add logical AND operator
2008-07-04 11:10:20 +01:00
19cbab78b2
Tidy up code to generate default branch of case
2008-07-03 20:04:47 +01:00
1736cd9bc8
Fix uneccessarily complicated generated case statement
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No need to generate separate case test variable if the
test in the VL source is a simple variable reference.
2008-07-03 16:27:36 +01:00
a5264e9995
Make sure all choices are covered in case statement
2008-07-03 16:17:56 +01:00
6868127ba3
Make sure case expression has the correct type
2008-07-03 16:14:17 +01:00
dbbadbc309
Make sure the renamed signal is used in the sensitivity list
2008-07-03 16:13:02 +01:00
500442e5c5
Working function calls
2008-06-25 22:15:57 +01:00
899a70908e
Fix small bug with initialisation and ammend comments
2008-06-24 20:13:18 +01:00
bf95d77562
Finish replacing vhdl_process with vhdl_procedural
2008-06-24 20:01:06 +01:00
75631bd8f1
Move is_inital code out of vhdl_process into vhdl_scope
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Part of tidy up before implementing functions
2008-06-24 19:06:06 +01:00
63b1887ff2
Refactor code to use the new vhdl_scope class
2008-06-24 18:52:25 +01:00
4188fbecee
Add XOR operator and catch default case branch
2008-06-24 10:55:45 +01:00
f261bf7e97
Fix bug where variables could be declared twice
2008-06-23 15:13:10 +01:00
f81129aa68
Fix some bugs with blocking assignment
2008-06-23 13:36:28 +01:00
469036990a
Output blocking assignments in the right place
2008-06-23 12:30:48 +01:00
Nick Gasson