github.com/JimmyHuang454/JLS-go@v0.0.0-20230831150107-90d536585ba0/cpu/cpu_x86.s (about)

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build 386 || amd64
     6  
     7  #include "textflag.h"
     8  
     9  // func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
    10  TEXT ·cpuid(SB), NOSPLIT, $0-24
    11  	MOVL eaxArg+0(FP), AX
    12  	MOVL ecxArg+4(FP), CX
    13  	CPUID
    14  	MOVL AX, eax+8(FP)
    15  	MOVL BX, ebx+12(FP)
    16  	MOVL CX, ecx+16(FP)
    17  	MOVL DX, edx+20(FP)
    18  	RET
    19  
    20  // func xgetbv() (eax, edx uint32)
    21  TEXT ·xgetbv(SB),NOSPLIT,$0-8
    22  	MOVL $0, CX
    23  	XGETBV
    24  	MOVL AX, eax+0(FP)
    25  	MOVL DX, edx+4(FP)
    26  	RET
    27  
    28  // func getGOAMD64level() int32
    29  TEXT ·getGOAMD64level(SB),NOSPLIT,$0-4
    30  #ifdef GOAMD64_v4
    31  	MOVL $4, ret+0(FP)
    32  #else
    33  #ifdef GOAMD64_v3
    34  	MOVL $3, ret+0(FP)
    35  #else
    36  #ifdef GOAMD64_v2
    37  	MOVL $2, ret+0(FP)
    38  #else
    39  	MOVL $1, ret+0(FP)
    40  #endif
    41  #endif
    42  #endif
    43  	RET