57 lines
1.3 KiB
ArmAsm
57 lines
1.3 KiB
ArmAsm
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// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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// Differential kernel for the arm64 out-of-band offsets: the ADD/SUB into
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// REGTMP for offsets within ±4095 no single instruction carries, and the
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// 24-bit hi/lo split for the wide bands. Every function is byte-compared
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// against go tool asm.
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#include "textflag.h"
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// func bytes()
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TEXT ·bytes(SB), NOSPLIT, $0-0
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MOVB R1, 4096(R2)
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MOVB R1, 8190(R2)
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MOVB R1, 65520(R2)
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MOVB R1, -4095(R2)
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MOVB 4096(R2), R1
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RET
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// func halves()
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TEXT ·halves(SB), NOSPLIT, $0-0
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MOVH R1, 16384(R2)
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MOVH R1, 16781310(R2)
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MOVH 0x2002(R1), R2
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MOVH R1, -4095(R2)
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RET
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// func words()
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TEXT ·words(SB), NOSPLIT, $0-0
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MOVW R1, 16388(R2)
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MOVW 0x4004(R1), R2
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MOVD R1, 4094(R2)
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MOVD R1, -300(R2)
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MOVD R1, 0x1006ff8(R2)
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MOVD 0x1006ff8(R1), R2
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FMOVS F1, 0x4004(R2)
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FMOVD F1, 0x1006ff8(R1)
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FMOVQ F1, 0x1003000(R2)
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RET
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// func pairs()
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TEXT ·pairs(SB), NOSPLIT, $0-0
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STP (R3, R4), 11(R0)
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STP (R3, R4), 1024(R0)
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STP (R3, R4), -4(R5)
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STP (R3, R4), 65536(R2)
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STPW (R3, R4), 1024(R0)
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LDP 11(R0), (R1, R2)
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LDP 1024(R0), (R1, R2)
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LDP -31(R0), (R1, R2)
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LDP 65536(R2), (R1, R2)
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LDPW -5(R0), (R1, R2)
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LDPSW 1024(R0), (R1, R2)
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FLDPD 1024(R0), (F1, F2)
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FLDPQ 1024(R0), (F1, F2)
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FLDPS 1024(R0), (F1, F2)
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RET
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