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The AMD Bulldozer family (bdver1 to bdver4, i.e. bulldozer, piledriver,
steamroller and excavator) is the only x86 family implementing the XOP
instruction set, together with the equally Bulldozer-specific FMA4 and
LWP extensions, and TBM starting with bdver2. All of them were dropped
again with Zen.
This can be verified with:
$ gcc -march=bdver1 -Q --help=target | grep -E '\-m(xop|fma4|tbm|lwp)'
-mfma4 [enabled]
-mlwp [enabled]
-mtbm [disabled]
-mxop [enabled]
$ gcc -march=bdver2 -Q --help=target | grep -E '\-m(xop|fma4|tbm|lwp)'
-mfma4 [enabled]
-mlwp [enabled]
-mtbm [enabled]
-mxop [enabled]
with bdver3 and bdver4 behaving like bdver2.
Add a hidden BR2_X86_CPU_HAS_XOP capability symbol and select it from
those four CPU variants, so that packages which cannot cope with this
instruction set can depend on it, instead of listing the CPU variants
one by one. The first user is host-qemu, whose TCG engine does not
implement XOP.
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f91407f012)
Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at https://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches