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2016-09-14cutils: Rewrite x86 buffer zero checkingRichard Henderson1-75/+156
Handle alignment of buffers, so that the vector paths can be used more often. Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1473800239-13841-1-git-send-email-rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13cutils: Add generic prefetchRichard Henderson1-0/+5
There's no real knowledge of the cacheline size, just prefetching one loop ahead. Signed-off-by: Richard Henderson <rth@twiddle.net> Message-Id: <1472496380-19706-7-git-send-email-rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13cutils: Add SSE4 versionPaolo Bonzini1-0/+10
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13cutils: Add test for buffer_is_zeroRichard Henderson1-0/+20
Signed-off-by: Richard Henderson <rth@twiddle.net> Message-Id: <1472496380-19706-6-git-send-email-rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13cutils: Remove ppc buffer zero checkingRichard Henderson1-25/+1
For ppc64le, gcc6 does extremely poorly with the Altivec code. Moreover, on POWER7 and POWER8, a hand-optimized Altivec version turns out to be no faster than the revised integer version, and therefore not worth the effort. Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13cutils: Remove aarch64 buffer zero checkingRichard Henderson1-15/+0
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>
2016-09-13cutils: Rearrange buffer_is_zero accelerationRichard Henderson1-191/+157
Allow selection of several acceleration functions based on the size and alignment of the buffer. Do not require ifunc support for AVX2 acceleration. Signed-off-by: Richard Henderson <rth@twiddle.net> Message-Id: <1472496380-19706-5-git-send-email-rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13cutils: Export only buffer_is_zeroRichard Henderson1-4/+4
Since the two users don't make use of the returned offset, beyond ensuring that the entire buffer is zero, consider the can_use_buffer_find_nonzero_offset and buffer_find_nonzero_offset functions internal. Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Richard Henderson <rth@twiddle.net> Message-Id: <1472496380-19706-4-git-send-email-rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13cutils: Remove SPLAT macroRichard Henderson1-4/+0
This is unused and complicates the vector interface. Signed-off-by: Richard Henderson <rth@twiddle.net> Message-Id: <1472496380-19706-3-git-send-email-rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13cutils: Move buffer_is_zero and subroutines to a new fileRichard Henderson1-0/+272
Signed-off-by: Richard Henderson <rth@twiddle.net> Message-Id: <1472496380-19706-2-git-send-email-rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-14 04:28:11 +0000