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Filename :
equal_riscv64.s
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// Copyright 2019 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. #include "go_asm.h" #include "textflag.h" #define CTXT S10 // func memequal(a, b unsafe.Pointer, size uintptr) bool TEXT runtime·memequal<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-25 // X10 = a_base // X11 = b_base // X12 = size JMP memequal<>(SB) // func memequal_varlen(a, b unsafe.Pointer) bool TEXT runtime·memequal_varlen<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-17 MOV 8(CTXT), X12 // compiler stores size at offset 8 in the closure // X10 = a_base // X11 = b_base JMP memequal<>(SB) // On entry X10 and X11 contain pointers, X12 contains length. // For non-regabi X13 contains address for return value. // For regabi return value in X10. TEXT memequal<>(SB),NOSPLIT|NOFRAME,$0 BEQ X10, X11, eq MOV $32, X23 BLT X12, X23, loop4_check // Check alignment - if alignment differs we have to do one byte at a time. AND $7, X10, X9 AND $7, X11, X19 BNE X9, X19, loop4_check BEQZ X9, loop32_check // Check one byte at a time until we reach 8 byte alignment. SUB X9, X0, X9 ADD $8, X9, X9 SUB X9, X12, X12 align: SUB $1, X9 MOVBU 0(X10), X19 MOVBU 0(X11), X20 BNE X19, X20, not_eq ADD $1, X10 ADD $1, X11 BNEZ X9, align loop32_check: MOV $32, X9 BLT X12, X9, loop16_check loop32: MOV 0(X10), X19 MOV 0(X11), X20 MOV 8(X10), X21 MOV 8(X11), X22 BNE X19, X20, not_eq BNE X21, X22, not_eq MOV 16(X10), X14 MOV 16(X11), X15 MOV 24(X10), X16 MOV 24(X11), X17 BNE X14, X15, not_eq BNE X16, X17, not_eq ADD $32, X10 ADD $32, X11 SUB $32, X12 BGE X12, X9, loop32 BEQZ X12, eq loop16_check: MOV $16, X23 BLT X12, X23, loop4_check loop16: MOV 0(X10), X19 MOV 0(X11), X20 MOV 8(X10), X21 MOV 8(X11), X22 BNE X19, X20, not_eq BNE X21, X22, not_eq ADD $16, X10 ADD $16, X11 SUB $16, X12 BGE X12, X23, loop16 BEQZ X12, eq loop4_check: MOV $4, X23 BLT X12, X23, loop1 loop4: MOVBU 0(X10), X19 MOVBU 0(X11), X20 MOVBU 1(X10), X21 MOVBU 1(X11), X22 BNE X19, X20, not_eq BNE X21, X22, not_eq MOVBU 2(X10), X14 MOVBU 2(X11), X15 MOVBU 3(X10), X16 MOVBU 3(X11), X17 BNE X14, X15, not_eq BNE X16, X17, not_eq ADD $4, X10 ADD $4, X11 SUB $4, X12 BGE X12, X23, loop4 loop1: BEQZ X12, eq MOVBU 0(X10), X19 MOVBU 0(X11), X20 BNE X19, X20, not_eq ADD $1, X10 ADD $1, X11 SUB $1, X12 JMP loop1 not_eq: MOVB ZERO, X10 RET eq: MOV $1, X10 RET