Changes in neon.uc

3de13550 - raid6: neon: add missing prototypes

Wed, 17 May 2023 13:22:12 +0000

raid6: neon: add missing prototypesThe raid6 syndrome functions are generated for different sizes and haveno generic prototype, while in the inner functions have a prototypein a header that cannot be included from the correct file. In bothcases, the compiler warns about missing prototypes:lib/raid6/recov_neon_inner.c:27:6: warning: no previous prototype for '__raid6_2data_recov_neon' [-Wmissing-prototypes]lib/raid6/recov_neon_inner.c:77:6: warning: no previous prototype for '__raid6_datap_recov_neon' [-Wmissing-prototypes]lib/raid6/neon1.c:56:6: warning: no previous prototype for 'raid6_neon1_gen_syndrome_real' [-Wmissing-prototypes]lib/raid6/neon1.c:86:6: warning: no previous prototype for 'raid6_neon1_xor_syndrome_real' [-Wmissing-prototypes]lib/raid6/neon2.c:56:6: warning: no previous prototype for 'raid6_neon2_gen_syndrome_real' [-Wmissing-prototypes]lib/raid6/neon2.c:97:6: warning: no previous prototype for 'raid6_neon2_xor_syndrome_real' [-Wmissing-prototypes]lib/raid6/neon4.c:56:6: warning: no previous prototype for 'raid6_neon4_gen_syndrome_real' [-Wmissing-prototypes]lib/raid6/neon4.c:119:6: warning: no previous prototype for 'raid6_neon4_xor_syndrome_real' [-Wmissing-prototypes]lib/raid6/neon8.c:56:6: warning: no previous prototype for 'raid6_neon8_gen_syndrome_real' [-Wmissing-prototypes]lib/raid6/neon8.c:163:6: warning: no previous prototype for 'raid6_neon8_xor_syndrome_real' [-Wmissing-prototypes]Add a new header file that contains the prototypes for both to avoidthe warnings.Signed-off-by: Arnd Bergmann Signed-off-by: Song Liu Link: https://lore.kernel.org/r/20230517132220.937200-1-arnd@kernel.org List of files: /linux-6.15/lib/raid6/neon.uc

1ad3935b - lib/raid6: use vdupq_n_u8 to avoid endianness warnings

Tue, 26 Feb 2019 04:03:42 +0000

lib/raid6: use vdupq_n_u8 to avoid endianness warningsClang warns: vector initializers are not compatible with NEON intrinsicsin big endian mode [-Wnonportable-vector-initialization]While this is usually the case, it's not an issue for this case sincewe're initializing the uint8x16_t (16x uint8_t's) with the same value.Instead, use vdupq_n_u8 which both compilers lower into a single moviinstruction: https://godbolt.org/z/vBrgztThis avoids the static storage for a constant value.Link: https://github.com/ClangBuiltLinux/linux/issues/214Suggested-by: Nathan Chancellor Reviewed-by: Ard Biesheuvel Signed-off-by: Nick Desaulniers Signed-off-by: Catalin Marinas List of files: /linux-6.15/lib/raid6/neon.uc

35129dde - md/raid6: use faster multiplication for ARM NEON delta syndrome

Thu, 13 Jul 2017 17:16:00 +0000

md/raid6: use faster multiplication for ARM NEON delta syndromeThe P/Q left side optimization in the delta syndrome simply involvesrepeatedly multiplying a value by polynomial 'x' in GF(2^8). Giventhat 'x * x * x * x' equals 'x^4' even in the polynomial world, wecan accelerate this substantially by performing up to 4 such operationsat once, using the NEON instructions for polynomial multiplication.Results on a Cortex-A57 running in 64-bit mode: Before: ------- raid6: neonx1 xor() 1680 MB/s raid6: neonx2 xor() 2286 MB/s raid6: neonx4 xor() 3162 MB/s raid6: neonx8 xor() 3389 MB/s After: ------ raid6: neonx1 xor() 2281 MB/s raid6: neonx2 xor() 3362 MB/s raid6: neonx4 xor() 3787 MB/s raid6: neonx8 xor() 4239 MB/sWhile we're at it, simplify MASK() by using a signed shift rather thana vector compare involving a temp register.Signed-off-by: Ard Biesheuvel Signed-off-by: Catalin Marinas List of files: /linux-6.15/lib/raid6/neon.uc

0e833e69 - md/raid6: delta syndrome for ARM NEON

Wed, 01 Jul 2015 02:19:56 +0000

md/raid6: delta syndrome for ARM NEONThis implements XOR syndrome calculation using NEON intrinsics.As before, the module can be built for ARM and arm64 from thesame source.Relative performance on a Cortex-A57 based system: raid6: int64x1 gen() 905 MB/s raid6: int64x1 xor() 881 MB/s raid6: int64x2 gen() 1343 MB/s raid6: int64x2 xor() 1286 MB/s raid6: int64x4 gen() 1896 MB/s raid6: int64x4 xor() 1321 MB/s raid6: int64x8 gen() 1773 MB/s raid6: int64x8 xor() 1165 MB/s raid6: neonx1 gen() 1834 MB/s raid6: neonx1 xor() 1278 MB/s raid6: neonx2 gen() 2528 MB/s raid6: neonx2 xor() 1942 MB/s raid6: neonx4 gen() 2888 MB/s raid6: neonx4 xor() 2334 MB/s raid6: neonx8 gen() 2957 MB/s raid6: neonx8 xor() 2232 MB/s raid6: using algorithm neonx8 gen() 2957 MB/s raid6: .... xor() 2232 MB/s, rmw enabledCc: Markus Stockhausen Cc: Neil Brown Signed-off-by: Ard Biesheuvel Signed-off-by: NeilBrown List of files: /linux-6.15/lib/raid6/neon.uc

7d11965d - lib/raid6: add ARM-NEON accelerated syndrome calculation

Thu, 16 May 2013 15:20:32 +0000

lib/raid6: add ARM-NEON accelerated syndrome calculationRebased/reworked a patch contributed by Rob Herring that usesNEON intrinsics to perform the RAID-6 syndrome calculations.It uses the existing unroll.awk code to generate severalunrolled versions of which the best performing one is selectedat boot time.Signed-off-by: Ard Biesheuvel Acked-by: Nicolas Pitre Cc: hpa@linux.intel.com List of files: /linux-6.15/lib/raid6/neon.uc