67 lines
1.4 KiB
ArmAsm
67 lines
1.4 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 integer slice: carry-setting arithmetic,
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// widening multiplies, bit manipulation, conditional compares, the compare
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// and test branches, ADR and the wide-constant moves. Every function is
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// byte-compared against go tool asm.
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#include "textflag.h"
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// func carryArith()
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TEXT ·carryArith(SB), NOSPLIT, $0-0
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ADC R0, R2, R12
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ADCS R23, R22, R22
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ADC $0, R1
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SBC R25, R10, R26
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SBCS R5, R9, R5
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SBCS $0, R1
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RET
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// func wideningMul()
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TEXT ·wideningMul(SB), NOSPLIT, $0-0
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MUL R4, R3, R0
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MSUB R19, R16, R26, R2
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SMULH R24, R20, R24
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UMULH R24, R20, R24
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RET
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// func bitManip()
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TEXT ·bitManip(SB), NOSPLIT, $0-0
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RBIT R11, R4
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REV R1, R2
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CLZ R21, R9
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REVW R1, R2
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CLSW R1, R2
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UBFX $33, R17, $25, R5
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UBFXW $4, R1, $9, R2
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RET
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// func condCompare()
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TEXT ·condCompare(SB), NOSPLIT, $0-0
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CCMP LE, R7, $19, $3
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CCMP LT, R30, R6, $7
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CCMN EQ, R1, R2, $3
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CCMPW LE, R7, $19, $3
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RET
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// func branchForms()
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TEXT ·branchForms(SB), NOSPLIT, $0-0
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CBZ R1, target
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CBNZ R7, target
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CBNZW R2, target
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TBZ $4, R7, target
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TBNZ $33, R7, target
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ADR target, R10
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target:
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RET
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// func wideMoves()
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TEXT ·wideMoves(SB), NOSPLIT, $0-0
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MOVK $1234, R5
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MOVK $305397760, R5
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MOVKW $1234, R5
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MOVK $16771847290880, R21
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RET
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