/* SPDX-License-Identifier: GPL-2.0 */ /* * NH - ε-almost-universal hash function, NEON accelerated version * * Copyright 2018 Google LLC * * Author: Eric Biggers */ #include .text .fpu neon KEY .req r0 MESSAGE .req r1 MESSAGE_LEN .req r2 HASH .req r3 PASS0_SUMS .req q0 PASS0_SUM_A .req d0 PASS0_SUM_B .req d1 PASS1_SUMS .req q1 PASS1_SUM_A .req d2 PASS1_SUM_B .req d3 PASS2_SUMS .req q2 PASS2_SUM_A .req d4 PASS2_SUM_B .req d5 PASS3_SUMS .req q3 PASS3_SUM_A .req d6 PASS3_SUM_B .req d7 K0 .req q4 K1 .req q5 K2 .req q6 K3 .req q7 T0 .req q8 T0_L .req d16 T0_H .req d17 T1 .req q9 T1_L .req d18 T1_H .req d19 T2 .req q10 T2_L .req d20 T2_H .req d21 T3 .req q11 T3_L .req d22 T3_H .req d23 .macro _nh_stride k0, k1, k2, k3 // Load next message stride vld1.8 {T3}, [MESSAGE]! // Load next key stride vld1.32 {\k3}, [KEY]! // Add message words to key words vadd.u32 T0, T3, \k0 vadd.u32 T1, T3, \k1 vadd.u32 T2, T3, \k2 vadd.u32 T3, T3, \k3 // Multiply 32x32 => 64 and accumulate vmlal.u32 PASS0_SUMS, T0_L, T0_H vmlal.u32 PASS1_SUMS, T1_L, T1_H vmlal.u32 PASS2_SUMS, T2_L, T2_H vmlal.u32 PASS3_SUMS, T3_L, T3_H .endm /* * void nh_neon(const u32 *key, const u8 *message, size_t message_len, * u8 hash[NH_HASH_BYTES]) * * It's guaranteed that message_len % 16 == 0. */ ENTRY(nh_neon) vld1.32 {K0,K1}, [KEY]! vmov.u64 PASS0_SUMS, #0 vmov.u64 PASS1_SUMS, #0 vld1.32 {K2}, [KEY]! vmov.u64 PASS2_SUMS, #0 vmov.u64 PASS3_SUMS, #0 subs MESSAGE_LEN, MESSAGE_LEN, #64 blt .Lloop4_done .Lloop4: _nh_stride K0, K1, K2, K3 _nh_stride K1, K2, K3, K0 _nh_stride K2, K3, K0, K1 _nh_stride K3, K0, K1, K2 subs MESSAGE_LEN, MESSAGE_LEN, #64 bge .Lloop4 .Lloop4_done: ands MESSAGE_LEN, MESSAGE_LEN, #63 beq .Ldone _nh_stride K0, K1, K2, K3 subs MESSAGE_LEN, MESSAGE_LEN, #16 beq .Ldone _nh_stride K1, K2, K3, K0 subs MESSAGE_LEN, MESSAGE_LEN, #16 beq .Ldone _nh_stride K2, K3, K0, K1 .Ldone: // Sum the accumulators for each pass, then store the sums to 'hash' vadd.u64 T0_L, PASS0_SUM_A, PASS0_SUM_B vadd.u64 T0_H, PASS1_SUM_A, PASS1_SUM_B vadd.u64 T1_L, PASS2_SUM_A, PASS2_SUM_B vadd.u64 T1_H, PASS3_SUM_A, PASS3_SUM_B vst1.8 {T0-T1}, [HASH] bx lr ENDPROC(nh_neon)