ARM64: Avoid tbl instruction on Cortex-A53/A57
Full-color compression speedups relative to previous commits:
Cortex-A53 (Nexus 5X), Android, 64-bit: 0.91-3.0% (avg. 1.8%)
Cortex-A57 (Nexus 5X), Android, 64-bit: -0.35-1.5% (avg. 0.65%)
diff --git a/simd/jsimd.h b/simd/jsimd.h
index a312930..d05a2ec 100644
--- a/simd/jsimd.h
+++ b/simd/jsimd.h
@@ -865,3 +865,7 @@
EXTERN(JOCTET*) jsimd_huff_encode_one_block_neon
(void * state, JOCTET *buffer, JCOEFPTR block, int last_dc_val,
c_derived_tbl *dctbl, c_derived_tbl *actbl);
+
+EXTERN(JOCTET*) jsimd_huff_encode_one_block_neon_slowtbl
+ (void * state, JOCTET *buffer, JCOEFPTR block, int last_dc_val,
+ c_derived_tbl *dctbl, c_derived_tbl *actbl);