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The generic VLdmStm class (modelling A32 VLDM/VSTM) is handling a wrong register list in a inconsistent way. Some instructions are opting for being decoded as Unknown, while others handle it inside the macro instruction constructor by manually adjusting the reglist. Those are two valid implementation of the CONSTRAINT UNPREDICTABLE behaviour (1 and 3): "If regs > 16 || (d+regs) > 32 , then one of the following behaviors must occur: 1) The instruction is UNDEFINED . 2) The instruction executes as NOP . 3) One or more of the SIMD and floating-point registers are UNKNOWN . If the instruction specifies writeback, the base register becomes UNKNOWN . This behavior does not affect any general-purpose registers." This patch unfies the behaviour by always opting for option 1) over 3) Change-Id: I4f98409243d5a2ec64113fe9c87e961a391abe94 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Ciro Santilli <ciro.santilli@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23106 Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/Introduction, and for more information about building the simulator and getting started please see http://www.gem5.org/Documentation and http://www.gem5.org/Tutorials. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/Dependencies for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ALPHA, ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/Build_System for more details and options. With the simulator built, have a look at http://www.gem5.org/Running_gem5 for more information on how to use gem5. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. Please see the gem5 download page for these items at http://www.gem5.org/Download If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.