Text file src/runtime/internal/sys/intrinsics_386.s

     1	// Copyright 2016 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	#include "textflag.h"
     6	
     7	TEXT runtime∕internal∕sys·Ctz64(SB), NOSPLIT, $0-12
     8		// Try low 32 bits.
     9		MOVL	x_lo+0(FP), AX
    10		BSFL	AX, AX
    11		JZ	tryhigh
    12		MOVL	AX, ret+8(FP)
    13		RET
    14	
    15	tryhigh:
    16		// Try high 32 bits.
    17		MOVL	x_hi+4(FP), AX
    18		BSFL	AX, AX
    19		JZ	none
    20		ADDL	$32, AX
    21		MOVL	AX, ret+8(FP)
    22		RET
    23	
    24	none:
    25		// No bits are set.
    26		MOVL	$64, ret+8(FP)
    27		RET
    28	
    29	TEXT runtime∕internal∕sys·Ctz32(SB), NOSPLIT, $0-8
    30		MOVL	x+0(FP), AX
    31		BSFL	AX, AX
    32		JNZ	2(PC)
    33		MOVL	$32, AX
    34		MOVL	AX, ret+4(FP)
    35		RET
    36	
    37	TEXT runtime∕internal∕sys·Ctz8(SB), NOSPLIT, $0-8
    38		MOVBLZX	x+0(FP), AX
    39		BSFL	AX, AX
    40		JNZ	2(PC)
    41		MOVL	$8, AX
    42		MOVL	AX, ret+4(FP)
    43		RET
    44	
    45	TEXT runtime∕internal∕sys·Bswap64(SB), NOSPLIT, $0-16
    46		MOVL	x_lo+0(FP), AX
    47		MOVL	x_hi+4(FP), BX
    48		BSWAPL	AX
    49		BSWAPL	BX
    50		MOVL	BX, ret_lo+8(FP)
    51		MOVL	AX, ret_hi+12(FP)
    52		RET
    53	
    54	TEXT runtime∕internal∕sys·Bswap32(SB), NOSPLIT, $0-8
    55		MOVL	x+0(FP), AX
    56		BSWAPL	AX
    57		MOVL	AX, ret+4(FP)
    58		RET

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