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| author | Matheus Ferst | 2022-03-05 07:16:46 +0100 |
|---|---|---|
| committer | Cédric Le Goater | 2022-03-05 07:16:46 +0100 |
| commit | 63c2b746bebef3ec9de4f29d5beeea4ee809c892 (patch) | |
| tree | 7db1fa2a7e4e3c9a6ca3a6e0cad939f710586074 /tests/migration/guestperf.py | |
| parent | tests/tcg/ppc64le: drop __int128 usage in bcdsub (diff) | |
| download | qemu-63c2b746bebef3ec9de4f29d5beeea4ee809c892.tar.gz qemu-63c2b746bebef3ec9de4f29d5beeea4ee809c892.tar.xz qemu-63c2b746bebef3ec9de4f29d5beeea4ee809c892.zip | |
tests/tcg/ppc64le: emit bcdsub with .long when needed
Based on GCC docs[1], we use the '-mpower8-vector' flag at config-time
to detect the toolchain support to the bcdsub instruction. LLVM/Clang
supports this flag since version 3.6[2], but the instruction and related
builtins were only added in LLVM 14[3]. In the absence of other means to
detect this support at config-time, we resort to __has_builtin to
identify the presence of __builtin_bcdsub at compile-time. If the
builtin is not available, the instruction is emitted with a ".long".
[1] https://gcc.gnu.org/onlinedocs/gcc-8.3.0/gcc/PowerPC-AltiVec_002fVSX-Built-in-Functions.html
[2] https://github.com/llvm/llvm-project/commit/59eb767e11d4ffefb5f55409524e5c8416b2b0db
[3] https://github.com/llvm/llvm-project/commit/c933c2eb334660c131f4afc9d194fafb0cec0423
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20220304165417.1981159-5-matheus.ferst@eldorado.org.br>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Diffstat (limited to 'tests/migration/guestperf.py')
0 files changed, 0 insertions, 0 deletions