65 lines
1.3 KiB
ArmAsm
65 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 riscv64 toolchain-synthesised instructions:
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// the Zbb-style pseudos the assembler expands instruction-for-instruction
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// (ANDN/ORN, MIN/MAX, ROR and friends, the reversed branches, FABSD), the
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// CSR read RDTIME and the FP sign-injection and fused-multiply-add forms.
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#include "textflag.h"
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TEXT ·logic(SB), NOSPLIT, $0-0
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ANDN X19, X20, X21
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ANDN X19, X20
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ANDN X21, X19, X21
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ORN X20, X19
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ORN X20, X19, X21
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MAX X26, X28, X29
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MAX X26, X28
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MAXU X28, X29, X30
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MAXU X28, X29
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MIN X29, X30, X5
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MIN X29, X30
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MINU X30, X5, X6
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MINU X30, X5
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MAX X5, X5
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MAX X5, X5, X6
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SEQZ X5, X6
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NEG X5, X6
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NEG X5
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NOT X5
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NOT X5, X6
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NOP
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RET
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TEXT ·rotate(SB), NOSPLIT, $0-0
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ROR X10, X11, X12
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ROR X10, X11
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ROR $63, X11
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RORIW $31, X13, X14
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RORIW $1, X14, X15
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RORIW $3, X14
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RORW X15, X16, X17
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RORW $31, X13
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RET
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TEXT ·fp(SB), NOSPLIT, $0-0
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FABSD F1, F2
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FSGNJD F1, F0, F2
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FMADDD F1, F2, F3, F4
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FMSUBD F1, F2, F3, F4
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FNMSUBD F1, F2, F3, F4
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FMADDS F1, F2, F3, F4
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FNMADDS F1, F2, F3, F4
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RET
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TEXT ·branches(SB), NOSPLIT, $0-0
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BGT X5, X6, tgt
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BLE X5, X6, tgt
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BGTU X5, X6, tgt
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BLEU X5, X6, tgt
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tgt:
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RDTIME X5
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RET
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