This PR fix the bug of vsetivli frequently flushing the pipeline.
Here are two pictures of the pipeline illustrate this phenomenon.
The vsetivli(0x00013334.0) instruction in the first picture flushes the
pipeline every time it is executed. This is due to vsetivli being
incorrectly flagged as a 'DirectControl' instruction. The branch
predictor cannot predict it correctly.
The second picture is the pipeline after fixing the bug.
Change-Id: I5bede47919c06cea86fa23a81624b502fbdc1159
This PR adds a RiscvDemoBoard that can be used with both SE and FS
mode.This was tested using the workloads riscv-matrix-multiply-run for
SE and riscv-ubuntu-20.04-boot for FS. Two example config scripts have
also been added.
Add decoder and function of AArch32 VRINTN, VRINTX, VRINTA, VRINTZ,
VRINTM, and VRINTP (Advanced SIMD) instructions. Support both 16-bit and
32-bit variants.
Add vfpFPRint in vfp.hh to perform the behavior of round-to-integer.
Only support A32 encoding.
Change-Id: Icb9b6f71edf16ea14a439e15c480351cd8e1eb88
Fix#1682. Treat LEA as a BigLdStOp. BigLdStOps (as well as other Big*
x86 uops) do not have input dependencies on 32-/64-bit destinations. LEA
will still have input dependencies on 16-bit destinations. (LEA cannot
have an 8-bit destination.)
Change-Id: I5d0678e6bd79bfd6064941a89c6fe290750543c9
Moving the address translation logic outside of the ISA::setMiscReg will
allow it to return and potentially invoke a fault
upon execution of the AT instruction. This change affects AArch64 mode
only
Originally, the debug print for read/write to specific register name
will happen after reg.read() and reg.write(). However, there might be
other debug print or warning inside reg.read(), reg.write() which would
be confusing if this debug log happen after all other debug print inside
reg.read(), reg.write().
Creating this commit to change the order.
Starting with https://github.com/gem5/gem5/pull/1453 , some Ruby
structures require a block size be set
and other require a pointer to the Ruby system. This fixes some cases
which were not covered by the per-checkin tests but seen in daily+
tests. In particular:
- WriteMasks and PerfectCacheMemory must explicitly set a block size.
- NetDest and RubyProxyPort require RubySystem pointer.
- Classes inheriting Message now have a setRubySystem collecting all
objects that need a RubySystem pointer and this should be called in
the constructor of the Message.
This commit makes sure all of these happen. This should fix daily
arm_boot_tests and daily learning_gem5 tests.
At some point 'system' -> 'board' in the stdlib code the replacement
policy tests used. Due to this the output is slightly different meaning
the refs need updated.
This was causing the Daily Tests to fail.
Move AT instructions out of setMiscReg.
Modification includes:
- Add template for AT instructions in misc64.isa.
- Add decoder and execution of AT instruction in aarch64.isa and
data64.isa.
- Add AtOp64 and AtOp64Hub to perform the behavior of AT instructions.
Change-Id: I7e8b802421f7335203edb9f8d748ad8669954b8c
This missing parameter causing the Learning gem5 tests to fail.
**Note:** We need to update the website's learning gem5 examples to
reflect this change.
Modifies union construction in the debug directory so output is more
amenable to alternative compilers. Verified that this change produces
code that builds with clang, gcc, msvc, nvhpc, aocc, icc, openxl, and
cray hpc.
These were the kinds of errors seen in MSVC, which this patch fixes.
```
debug/Decoder.hh(24): error C2461: 'gem5::debug::unions::Decoder': constructor syntax missing formal parameters
debug/Decoder.hh(31): error C7624: Type name 'gem5::debug::unions::Decoder' cannot appear on the right side of a class member access expression
```
This PR addresses comments from #1584
- removed tests using the same binary multiple times. Each binary is
tested once with one graph
- Updated the input sizes as per the comments in the above mentioned PR
This PR adds the SMS prefetcher described in [this
](https://web.eecs.umich.edu/~twenisch/papers/isca06.pdf) paper.
This work was done in collaboration with @Setu-Gupta, and @xmlizhao
On branch sms
Changes to be committed:
modified: src/mem/cache/prefetch/Prefetcher.py
modified: src/mem/cache/prefetch/SConscript
new file: src/mem/cache/prefetch/sms.cc
new file: src/mem/cache/prefetch/sms.hh
Change-Id: I68d3bb6cf07385177d0f776fb958f652cfc41489
We are implementing derived classes of SignalSinkPort that does some
additional logic after it's triggered (set() invoked by SignalSourcePort
peer), and before executing the callback that a device provides (in
onChange_). The logic is like additional logging, or providing debugging
features. However, set() itself directly calls the onChange_ callback.
Making the set() virtual could provide the flexibility to achieve this
feature.
This demo board is a preset arm board, that can be used to run example
gem5 simulations. This board doesnt simulate any known hardware.
The board will be used to run benchmarks such as gapbs and npb to
collect stats. The plan is to show these stats on the gem5 resources
website to provide more details about the resources.
1. Implement Zcmp(cm.push, cm.pop, cm.popret, cm.popretz, cm.mva01s,
cm.mvsa01) instructions
2. The Zcd instructions overlap the Zcmp and Zcmt instruction. This
option is used to enable/disable Zcd extension, implies enable Zcmp/Zcmt
extension. If Zcd is enable, the Zcmp and Zcmt is disabled. Otherwise,
Zcmp and Zcmt is enabled.
Spec: https://github.com/riscv/riscv-isa-manual/blob/main/src/zc.adoc
- This change updates syntax of constructors of Template Classes from
`class<T>()` to `class()`
- Initializes coherence to 0 in `src/mem/cache_blk.hh`
The above changes are made to solve the errors when compiling gem5 in
gcc 14
This commit modifies X86DemoBoard so it has numbers more similar to that
of RiscvDemoBoard and ArmDemoBoard. It also adds SE mode to
X86DemoBoard. Note that the changes here depend on the changes in PR
1579.
**Note**: This PR was created so @BobbyRBruce could add his commits to
#1600
---------
Co-authored-by: Erin Le <ejle@ucdavis.edu>
There were a number of variables in the arm and x86 decoders that are
static (e.g., the decode cache). It's a bit interesting that this
doesn't cause problems with multiple cores since each core has its own
decoder.
However, this causes segfaults if you run different cores on different
*host* threads. We are experimenting with running gem5 with multiple
host thread (i.e., in parallel), and removing these static variables
resolves the segfault.
This change also adds const to any other static variables to ensure that
they cannot be modified.
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
The Zcd instructions overlap the Zcmp and Zcmt instruction
This option is used to enable/disable Zcd extension, implies enable
Zcmp/Zcmt extension. If Zcd is enable, the Zcmp and Zcmt is disabled.
Otherwise, Zcmp and Zcmt is enabled.
Spec: https://github.com/riscv/riscv-isa-manual/blob/main/src/zc.adoc#zc-overview
Change-Id: I3788eb6539e13a210c9946efc43ca1fef4639560
There are two issues related to setting an element in PackedReg where
the element spans multiple dwords. First, the mask value is wrong and is
clobbering both dwords. Second, a portion of the value is shifted out of
the narrower input type.
Fix this by using the correct mask to clear the bits where the value
will be placed and use a larger data type to shift the value into place.
* Deprecates the setting of FS/SE mode via the `Simulator` module.
* Moved the creation of the `Root` object from the `Simulator` to the
board.
* Moved the setting of `sim_quantum` from the `Simulator` to the
processor.
* Allows for easier development of boards which support both SE and FS
mode simulation by moving board setup function calls to occur after the
set_workload function is call which sets a boards stats `is_fs` status.
This pops up in kernel 6.8.0. The device it is trying to write is
currently unknown but does not cause problems ignoring the device,
therefore change the panic to a warning and responding to the request
with the default PCI latency.
Change-Id: I4c1229753a75a94a255d8cfd411ac7311283366b
'ext' is set as a Python source path for gem5, like 'src/python'. It
helps vscode users to have vscode aware of this to better analytics and
reduce warnings (most comminly "unable to resolve import).
'tests' isn't in the Python source path when compiling gem5 but it is
when running `tests/main.py`. Though somewhat unideal as is lets vscode
think files in 'src' can import from files in 'test', adding this helps
vscode Python analytics parse the test files which reduces warnings and
aids in betters navigation of the testing code. This is particularly
helpful given the complexity of the testlib testing infrastructure.
With this patch the pannotia tests now:
1. Download the resources to 'gpu-pannotia' in the
'tests/gem5/resources' directory. This is where other test resources are
store.
2. Download thr USA-road-d.NY.gr dataset from Google cloud bucket in a
decompressed state.
2. Avoid re-download the resources if they are already present on the
host machine.
`edited` is what forces a re-run of our tests when the PR title is
updated and other minor metadata stuff. I believe all changes to the
code are covered by the remainder. `synchronize` is means the PR is
triggered with the when the this PR is from (in this case my forked gem5
repo) is synced with the PR branch here. This covers the vast majority
of cases we care about. `opended` covers for the case where the PR is
created and `ready_for_review` for when something moves out of a draft.
Ruby requires each machine type to have a continuous set of version
numbers starting at 0. We were hiding this from users/developers by
using a Python class variable in the stdlib. Unfortunately, with
multiple ruby systems this doesn't work anymore.
As a stop-gap this change adds "resetting" these versions to the
beginning of `incorporate_caches`. It would be better to fix this in the
C++ code (and assign these numbers in C++ probably via the RubySystem),
but that's a bigger change than is needed right now.
---------
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Add decoder and function of AArch32 VRINTN, VRINTX, VRINTA, VRINTZ,
VRINTM, and VRINTP (Advanced SIMD) instructions. Support both 16-bit and
32-bit variants.
Add vfpFPRint in vfp.hh to perform the behavior of round-to-integer.
Only support A32 encoding.
Change-Id: Icb9b6f71edf16ea14a439e15c480351cd8e1eb88
Add decoder and function of AArch32 VCVTA, VCVTP, VCVTN and VCVTM
instructions. Support both 16-bit and 32-bit variants.
Only support A32 encoding.
Change-Id: I6ece0e1b779f9a7cc9d709894a49a7fdcda28373
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
This PR fixes the bug where simInsts and simOps don't reset when
m5.stats.reset() is called. The stats hostInstRate and hostOpRate are
affected by this change as well, as they depend on simInsts and simOps
respectively.
This is related to issue 1443 linked
[here](https://github.com/gem5/gem5/issues/1443).
This allows vscode to resolve python imported from "src/python".
Warnings regarding these imports are numerous and the issue stops users
of vscode to utilizubg features like navigating the codebase though "Go
to Definition" queries on imported classes/functions.
