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| author | Richard Henderson <rth@twiddle.net> | 2016-08-29 11:46:19 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-13 19:13:31 +0200 |
| commit | 2250d3a293d36ed9d8143d4c3d3e94086c429af4 (patch) | |
| tree | 9aab32cfb0fd5cc2351a7f5ee6f72da26a8949e1 /util | |
| parent | 5e33a8722254f99cbce6ede73adb4b735d94f58f (diff) | |
| download | qemu-2250d3a293d36ed9d8143d4c3d3e94086c429af4.zip qemu-2250d3a293d36ed9d8143d4c3d3e94086c429af4.tar.gz qemu-2250d3a293d36ed9d8143d4c3d3e94086c429af4.tar.bz2 | |
cutils: Remove aarch64 buffer zero checking
The revised integer version is 4 times faster than the neon version
on an AppliedMicro Mustang. Even with hand scheduling and additional
unrolling I cannot make any neon version run as fast as the integer.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'util')
| -rw-r--r-- | util/bufferiszero.c | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/util/bufferiszero.c b/util/bufferiszero.c index 025cb8f..e6679b3 100644 --- a/util/bufferiszero.c +++ b/util/bufferiszero.c @@ -200,21 +200,6 @@ static bool select_accel_fn(const void *buf, size_t len) return buffer_zero_int(buf, len); } -#elif defined(__aarch64__) -#include "arm_neon.h" - -#define DO_NONZERO(X) (vgetq_lane_u64((X), 0) | vgetq_lane_u64((X), 1)) -ACCEL_BUFFER_ZERO(buffer_zero_neon, 128, uint64x2_t, DO_NONZERO) - -static bool select_accel_fn(const void *buf, size_t len) -{ - uintptr_t ibuf = (uintptr_t)buf; - if (len % 128 == 0 && ibuf % sizeof(uint64x2_t) == 0) { - return buffer_zero_neon(buf, len); - } - return buffer_zero_int(buf, len); -} - #else #define select_accel_fn buffer_zero_int #endif |