75 lines
1.5 KiB
ArmAsm
75 lines
1.5 KiB
ArmAsm
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// Code generated by command: go run swap64_asm.go -pkg bswap -out ../bswap/swap64_amd64.s -stubs ../bswap/swap64_amd64.go. DO NOT EDIT.
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//go:build !purego
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#include "textflag.h"
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// func swap64(b []byte)
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// Requires: AVX, AVX2
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TEXT ·swap64(SB), NOSPLIT, $0-24
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MOVQ b_base+0(FP), AX
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MOVQ b_len+8(FP), CX
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MOVQ AX, DX
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ADDQ CX, DX
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BTL $0x08, github·com∕segmentio∕asm∕cpu·X86+0(SB)
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JCC x86_loop
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VMOVDQU shuffle_mask<>+0(SB), Y0
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avx2_loop:
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MOVQ AX, CX
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ADDQ $0x80, CX
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CMPQ CX, DX
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JAE x86_loop
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VMOVDQU (AX), Y1
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VMOVDQU 32(AX), Y2
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VMOVDQU 64(AX), Y3
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VMOVDQU 96(AX), Y4
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VPSHUFB Y0, Y1, Y1
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VPSHUFB Y0, Y2, Y2
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VPSHUFB Y0, Y3, Y3
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VPSHUFB Y0, Y4, Y4
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VMOVDQU Y1, (AX)
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VMOVDQU Y2, 32(AX)
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VMOVDQU Y3, 64(AX)
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VMOVDQU Y4, 96(AX)
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MOVQ CX, AX
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JMP avx2_loop
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x86_loop:
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MOVQ AX, CX
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ADDQ $0x20, CX
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CMPQ CX, DX
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JAE slow_loop
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MOVQ (AX), BX
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MOVQ 8(AX), SI
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MOVQ 16(AX), DI
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MOVQ 24(AX), R8
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BSWAPQ BX
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BSWAPQ SI
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BSWAPQ DI
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BSWAPQ R8
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MOVQ BX, (AX)
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MOVQ SI, 8(AX)
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MOVQ DI, 16(AX)
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MOVQ R8, 24(AX)
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MOVQ CX, AX
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JMP x86_loop
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slow_loop:
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CMPQ AX, DX
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JAE done
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MOVQ (AX), CX
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BSWAPQ CX
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MOVQ CX, (AX)
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ADDQ $0x08, AX
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JMP slow_loop
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done:
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RET
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DATA shuffle_mask<>+0(SB)/8, $0x0001020304050607
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DATA shuffle_mask<>+8(SB)/8, $0x08090a0b0c0d0e0f
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DATA shuffle_mask<>+16(SB)/8, $0x0001020304050607
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DATA shuffle_mask<>+24(SB)/8, $0x08090a0b0c0d0e0f
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GLOBL shuffle_mask<>(SB), RODATA|NOPTR, $32
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