71 lines
2.0 KiB
ArmAsm
71 lines
2.0 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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// Wide-immediate arithmetic: every classification band of the ADD/SUB
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// immediate family (single imm12, the ADDCON2 split, bitmask and MOVZ/MOVN/
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// MOVK materialisations into REGTMP) plus the logical bitmask immediates and
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// their materialised fallback. Byte-for-byte against go tool asm.
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#include "textflag.h"
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// imm12 covers the plain and shifted-by-12 imm12 forms.
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TEXT ·imm12(SB), NOSPLIT, $0-0
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ADD $1, R2, R3
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ADD $0x000aaa, R2, R3
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ADD $0xaaa000, R2
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SUB $0x000aaa, R2, R3
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SUB $0xaaa000, R2
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ADDW $40960, R0
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CMP $40960, R0
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CMPW $40960, R0
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RET
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// split pins the ADDCON2 band: two imm12 instructions, low half first.
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TEXT ·split(SB), NOSPLIT, $0-0
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ADD $0xaaaaaa, R2, R3
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SUB $0xaaaaaa, R2
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ADD $0x186a0, R2, R5
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SUB $0x186a0, R2, R3
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ADDW $0x60060, R2
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RET
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// regtmp covers the single-word materialisations: MOVZ for a movcon value,
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// MOVN for the complement form, the bitmask ORR otherwise.
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TEXT ·regtmp(SB), NOSPLIT, $0-0
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ADD $0x1ffe00, R2, R3
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ADD $0x3fffffffc000, R5
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ADD $-2048, R2, R3
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ADD $-100000, R2, R3
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CMP $0x1000000, R2
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CMP $0x100000000, R0
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SUB $-0x100000000, R0, R1
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RET
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// movseq covers the omovlconst sequences: MOVZ/MOVN ladders and the
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// compare forms that never split.
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TEXT ·movseq(SB), NOSPLIT, $0-0
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ADD $0x12345678, R2, R3
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SUB $0xe7791f700, R3, R1
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CMP $0xaaaaaa, R2
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CMP $0xffffffffffa0, R3
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CMPW $27745, R2
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CMPW $0x60060, R2
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ADDS $0xaaaaaa, R2, R3
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CMN $0x1000000, R2
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ADDW $0x12345678, R2, R3
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RET
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// logical covers the bitmask immediates of the logical family and the
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// materialised fallback for the values a bitmask cannot carry.
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TEXT ·logical(SB), NOSPLIT, $0-0
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AND $0x3ff00000, R2, R3
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BIC $0x22220000, R3, R4
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ORR $0x3ff00000, R2
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EOR $0x3ff00000, R2, R3
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ANDS $0x3ff00000, R2
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ORNW $0x3ff00000, R2
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EONW $0x3ff00000, R2
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BICSW $0x6006000060060, R5
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TST $0x4900000049, R0
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RET
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