af98e17364
The latest Power ISA introduces two new bits that record carry and overflow out of bit 31 of the result, namely CA32 and OV32 respectively, thereby changing the behaviour of the add and subtract instructions that set them. Also, now that 64-bit registers are being used, the nature of the result, i.e. less than, greater than or equal to zero, must be set by a 64-bit signed comparison of the result to zero. This fixes the following instructions. * Add Immediate (addi) * Add Immediate Shifted (addis) * Add (add[o][.]) * Subtract From (subf[o][.]) * Add Immediate Carrying (addic) * Add Immediate Carrying and Record (addic.) * Subtract From Immediate Carrying (subfic) * Add Carrying (addc[o][.]) * Subtract From Carrying (subfc[o][.]) * Add Extended (adde[o][.]) * Subtract From Extended (subfe[o][.]) * Add to Zero Extended (addze[o][.]) * Subtract From Zero Extended (subfze[o][.]) * Negate (neg[o][.]) * Multiply Low Immediate (mulli) * Multiply Low Word (mullw[o][.]) * Multiply High Word (mulhw[.]) * Multiply High Word Unsigned (mulhwu[.]) * Divide Word (divw[o][.]) * Divide Word Unsigned (divwu[o][.]) Change-Id: I8c79f1dca8b19010ed7b734d7ec9bb598df428c3 Signed-off-by: Sandipan Das <sandipan@linux.ibm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40899 Reviewed-by: Boris Shingarov <shingarov@labware.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> 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/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. 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/documentation/general_docs/building 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 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/documentation/general_docs/building for more details and options. 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. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.