Commit Graph

5 Commits (08c0c4c1b41b3e7d18b9c3fa4a9bdfa42b5f491c)

Author SHA1 Message Date
Lars Asplund 08c0c4c1b4 Make core testbenches recognized by VUnit
This commit also removes the dependencies these testbenches have on VHPIDIRECT.
The use of VHPIDIRECT limits the number of available simulators for the project. Rather than using
foreign functions the testbenches can be implemented entirely in VHDL where equivalent functionality exists.
For these testbenches the VHPIDIRECT-based randomization functions were replaced with VHDL-based functions.

The testbenches recognized by VUnit can be executed in parallel threads for better simulation performance using
the -p option to the run.py script

Signed-off-by: Lars Asplund <lars.anders.asplund@gmail.com>
3 years ago
Anton Blanchard 21f482f967 Reformat testbenches
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard ab86b58d95 Exit cleanly from testbench on success
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
4 years ago
Paul Mackerras 8a0a907e2f Implement the extswsli instruction
This mainly required the addition of an entry to the opcode 31 decode
table and a 32-bit sign-extender in the rotator.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
4 years ago
Paul Mackerras f7c393ba7e Add a rotate/mask/shift unit and use it in execute1
This adds a new entity 'rotator' which contains combinatorial logic
for rotating and masking 64-bit values.  It implements the operations
of the rlwinm, rlwnm, rlwimi, rldicl, rldicr, rldic, rldimi, rldcl,
rldcr, sld, slw, srd, srw, srad, sradi, sraw and srawi instructions.
It consists of a 3-stage 64-bit rotator using 4:1 multiplexors at
each stage, two mask generators, output logic and control logic.

The insn_type_t values used for these instructions have been reduced
to just 5: OP_RLC, OP_RLCL and OP_RLCR for the rotate and mask
instructions (clear both left and right, clear left, clear right
variants), OP_SHL for left shifts, and OP_SHR for right shifts.
The control signals for the rotator are derived from the opcode
and from the is_32bit and is_signed fields of the decode_rom_t.

The rotator is instantiated as an entity in execute1 so that we can
be sure we only have one of it.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
4 years ago