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| author |   Alexander Monakov <amonakov@ispras.ru> | 2024-02-06 23:48:07 +0300 |
|---|---|---|
| committer |   Richard Henderson <richard.henderson@linaro.org> | 2024-05-03 08:03:05 -0700 |
| commit | 93a6085618f16fb2cd316d1e84f1a638b7e2d8ff (patch) | |
| tree | 68e4b09262ecdf1029e21b95ac5009ba53212579 /scripts/coverage/compare_gcov_json.py | |
| parent | util/bufferiszero: Reorganize for early test for acceleration (diff) | |
| download | qemu-93a6085618f16fb2cd316d1e84f1a638b7e2d8ff.tar.xz qemu-93a6085618f16fb2cd316d1e84f1a638b7e2d8ff.zip | |
util/bufferiszero: Remove useless prefetches
Use of prefetching in bufferiszero.c is quite questionable:
- prefetches are issued just a few CPU cycles before the corresponding
line would be hit by demand loads;
- they are done for simple access patterns, i.e. where hardware
prefetchers can perform better;
- they compete for load ports in loops that should be limited by load
port throughput rather than ALU throughput.
Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Signed-off-by: Mikhail Romanov <mmromanov@ispras.ru>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240206204809.9859-5-amonakov@ispras.ru>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions