| Linux in-mum-web1499.main-hosting.eu 5.14.0-503.40.1.el9_5.x86_64 #1 SMP PREEMPT_DYNAMIC Mon May 5 06:06:04 EDT 2025 x86_64 Path : /opt/golang/1.22.0/src/crypto/subtle/ |
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// Copyright 2018 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build (ppc64 || ppc64le) && !purego #include "textflag.h" // func xorBytes(dst, a, b *byte, n int) TEXT ·xorBytes(SB), NOSPLIT, $0 MOVD dst+0(FP), R3 // R3 = dst MOVD a+8(FP), R4 // R4 = a MOVD b+16(FP), R5 // R5 = b MOVD n+24(FP), R6 // R6 = n CMPU R6, $64, CR7 // Check if n ≥ 64 bytes MOVD R0, R8 // R8 = index CMPU R6, $8, CR6 // Check if 8 ≤ n < 64 bytes BLE CR6, small // <= 8 BLT CR7, xor32 // Case for 32 ≤ n < 64 bytes // Case for n ≥ 64 bytes preloop64: SRD $6, R6, R7 // Set up loop counter MOVD R7, CTR MOVD $16, R10 MOVD $32, R14 MOVD $48, R15 ANDCC $63, R6, R9 // Check for tailing bytes for later PCALIGN $16 // Case for >= 64 bytes // Process 64 bytes per iteration // Load 4 vectors of a and b // XOR the corresponding vectors // from a and b and store the result loop64: LXVD2X (R4)(R8), VS32 LXVD2X (R4)(R10), VS34 LXVD2X (R4)(R14), VS36 LXVD2X (R4)(R15), VS38 LXVD2X (R5)(R8), VS33 LXVD2X (R5)(R10), VS35 LXVD2X (R5)(R14), VS37 LXVD2X (R5)(R15), VS39 XXLXOR VS32, VS33, VS32 XXLXOR VS34, VS35, VS34 XXLXOR VS36, VS37, VS36 XXLXOR VS38, VS39, VS38 STXVD2X VS32, (R3)(R8) STXVD2X VS34, (R3)(R10) STXVD2X VS36, (R3)(R14) STXVD2X VS38, (R3)(R15) ADD $64, R8 ADD $64, R10 ADD $64, R14 ADD $64, R15 BDNZ loop64 BC 12,2,LR // BEQLR MOVD R9, R6 CMP R6, $8 BLE small // Case for 8 <= n < 64 bytes // Process 32 bytes if available xor32: CMP R6, $32 BLT xor16 ADD $16, R8, R9 LXVD2X (R4)(R8), VS32 LXVD2X (R4)(R9), VS33 LXVD2X (R5)(R8), VS34 LXVD2X (R5)(R9), VS35 XXLXOR VS32, VS34, VS32 XXLXOR VS33, VS35, VS33 STXVD2X VS32, (R3)(R8) STXVD2X VS33, (R3)(R9) ADD $32, R8 ADD $-32, R6 CMP R6, $8 BLE small // Case for 8 <= n < 32 bytes // Process 16 bytes if available xor16: CMP R6, $16 BLT xor8 LXVD2X (R4)(R8), VS32 LXVD2X (R5)(R8), VS33 XXLXOR VS32, VS33, VS32 STXVD2X VS32, (R3)(R8) ADD $16, R8 ADD $-16, R6 small: CMP R6, R0 BC 12,2,LR // BEQLR xor8: #ifdef GOPPC64_power10 SLD $56,R6,R17 ADD R4,R8,R18 ADD R5,R8,R19 ADD R3,R8,R20 LXVL R18,R17,V0 LXVL R19,R17,V1 VXOR V0,V1,V1 STXVL V1,R20,R17 RET #else CMP R6, $8 BLT xor4 // Case for 8 ≤ n < 16 bytes MOVD (R4)(R8), R14 // R14 = a[i,...,i+7] MOVD (R5)(R8), R15 // R15 = b[i,...,i+7] XOR R14, R15, R16 // R16 = a[] ^ b[] SUB $8, R6 // n = n - 8 MOVD R16, (R3)(R8) // Store to dst ADD $8, R8 xor4: CMP R6, $4 BLT xor2 MOVWZ (R4)(R8), R14 MOVWZ (R5)(R8), R15 XOR R14, R15, R16 MOVW R16, (R3)(R8) ADD $4,R8 ADD $-4,R6 xor2: CMP R6, $2 BLT xor1 MOVHZ (R4)(R8), R14 MOVHZ (R5)(R8), R15 XOR R14, R15, R16 MOVH R16, (R3)(R8) ADD $2,R8 ADD $-2,R6 xor1: CMP R6, R0 BC 12,2,LR // BEQLR MOVBZ (R4)(R8), R14 // R14 = a[i] MOVBZ (R5)(R8), R15 // R15 = b[i] XOR R14, R15, R16 // R16 = a[i] ^ b[i] MOVB R16, (R3)(R8) // Store to dst #endif done: RET