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g++ --version

g++ -std=c++11 -O2 -Wall -pedantic -pthread main.cpp -S -masm=intel -o test.asm && cat test.asm | c++filt

g++ (GCC) 5.2.0

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

.file "main.cpp"

.intel_syntax noprefix

.section .rodata.str1.1,"aMS",@progbits,1

.LC1:

.LC0:

.string "visible effect\n"

.section .text.unlikely,"ax",@progbits

.LCOLDB2:

.LCOLDB1:

.section .text.startup,"ax",@progbits

.LHOTB2:

.LHOTB1:

.p2align 4,,15

.globl main

.type main, @function

main:

.LFB1408:

.cfi_startproc

sub rsp, 40

.cfi_def_cfa_offset 48

mov rax, QWORD PTR std::cin[rip]

mov QWORD PTR [rsp], OFFSET FLAT:std::cin

mov rax, QWORD PTR [rax-24]

test BYTE PTR std::cin[rax+32], 5

je .L2

mov BYTE PTR [rsp+16], 0

.L9:

jmp .L13

cmp BYTE PTR guard variable for main::itend[rip], 0

jne .L10

jmp .L19

.p2align 4,,10

.p2align 3

.L7:

mov edx, 15

mov esi, OFFSET FLAT:.LC1

mov esi, OFFSET FLAT:.LC0

mov edi, OFFSET FLAT:std::cout

call std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)

.L10:

.L13:

movzx eax, BYTE PTR [rsp+16]

cmp BYTE PTR [rsp+16], 0

cmp al, BYTE PTR main::itend[rip+16]

jne .L7

mov rcx, QWORD PTR main::itend[rip]

cmp QWORD PTR [rsp], rcx

sete dl

cmp al, dl

ja .L7

xor eax, eax

add rsp, 40

.cfi_remember_state

.cfi_def_cfa_offset 8

ret

.L2:

.cfi_restore_state

lea rsi, [rsp+8]

mov edi, OFFSET FLAT:std::cin

mov BYTE PTR [rsp+16], 1

call std::basic_istream<char, std::char_traits<char> >& std::basic_istream<char, std::char_traits<char> >::_M_extract<double>(double&)

mov rax, QWORD PTR [rsp]

mov rdx, QWORD PTR [rax]

mov rdx, QWORD PTR [rdx-24]

test BYTE PTR [rax+32+rdx], 5

sete BYTE PTR [rsp+16]

jmp .L9

jmp .L13

.L19:

mov edi, OFFSET FLAT:guard variable for main::itend

call __cxa_guard_acquire

test eax, eax

je .L10

mov edi, OFFSET FLAT:guard variable for main::itend

mov QWORD PTR main::itend[rip], 0

mov QWORD PTR main::itend[rip+8], 0

mov BYTE PTR main::itend[rip+16], 0

call __cxa_guard_release

jmp .L10

.cfi_endproc

.LFE1408:

.size main, .-main

.section .text.unlikely

.LCOLDE2:

.LCOLDE1:

.section .text.startup

.LHOTE2:

.LHOTE1:

.section .text.unlikely

.LCOLDB3:

.LCOLDB2:

.section .text.startup

.LHOTB3:

.LHOTB2:

.p2align 4,,15

.type _GLOBAL__sub_I_main, @function

_GLOBAL__sub_I_main:

.LFB1609:

.cfi_startproc

sub rsp, 8

.cfi_def_cfa_offset 16

mov edi, OFFSET FLAT:std::__ioinit

call std::ios_base::Init::Init()

mov edx, OFFSET FLAT:__dso_handle

mov esi, OFFSET FLAT:std::__ioinit

mov edi, OFFSET FLAT:std::ios_base::Init::~Init()

add rsp, 8

.cfi_def_cfa_offset 8

jmp __cxa_atexit

.cfi_endproc

.LFE1609:

.size _GLOBAL__sub_I_main, .-_GLOBAL__sub_I_main

.section .text.unlikely

.LCOLDE3:

.LCOLDE2:

.section .text.startup

.LHOTE3:

.LHOTE2:

.section .init_array,"aw"

.align 8

.quad _GLOBAL__sub_I_main

.local main::itend

.comm main::itend,24,16

.local guard variable for main::itend

.comm guard variable for main::itend,8,8

.local std::__ioinit

.comm std::__ioinit,1,1

.hidden __dso_handle

.ident "GCC: (GNU) 5.2.0"

.section .note.GNU-stack,"",@progbits

保存された差分

原文

ファイルを開く

g++ --version
g++ -std=c++11 -O2 -Wall -pedantic -pthread main.cpp -S -masm=intel -o test.asm && cat test.asm | c++filt
g++ (GCC) 5.2.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

.file	"main.cpp"
	.intel_syntax noprefix
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC1:
	.string	"visible effect\n"
	.section	.text.unlikely,"ax",@progbits
.LCOLDB2:
	.section	.text.startup,"ax",@progbits
.LHOTB2:
	.p2align 4,,15
	.globl	main
	.type	main, @function
main:
.LFB1408:
	.cfi_startproc
	sub	rsp, 40
	.cfi_def_cfa_offset 48
	mov	rax, QWORD PTR std::cin[rip]
	mov	QWORD PTR [rsp], OFFSET FLAT:std::cin
	mov	rax, QWORD PTR [rax-24]
	test	BYTE PTR std::cin[rax+32], 5
	je	.L2
	mov	BYTE PTR [rsp+16], 0
.L9:
	cmp	BYTE PTR guard variable for main::itend[rip], 0
	jne	.L10
	jmp	.L19
	.p2align 4,,10
	.p2align 3
.L7:
	mov	edx, 15
	mov	esi, OFFSET FLAT:.LC1
	mov	edi, OFFSET FLAT:std::cout
	call	std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
.L10:
	movzx	eax, BYTE PTR [rsp+16]
	cmp	al, BYTE PTR main::itend[rip+16]
	jne	.L7
	mov	rcx, QWORD PTR main::itend[rip]
	cmp	QWORD PTR [rsp], rcx
	sete	dl
	cmp	al, dl
	ja	.L7
	xor	eax, eax
	add	rsp, 40
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L2:
	.cfi_restore_state
	lea	rsi, [rsp+8]
	mov	edi, OFFSET FLAT:std::cin
	mov	BYTE PTR [rsp+16], 1
	call	std::basic_istream<char, std::char_traits<char> >& std::basic_istream<char, std::char_traits<char> >::_M_extract<double>(double&)
	mov	rax, QWORD PTR [rsp]
	mov	rdx, QWORD PTR [rax]
	mov	rdx, QWORD PTR [rdx-24]
	test	BYTE PTR [rax+32+rdx], 5
	sete	BYTE PTR [rsp+16]
	jmp	.L9
.L19:
	mov	edi, OFFSET FLAT:guard variable for main::itend
	call	__cxa_guard_acquire
	test	eax, eax
	je	.L10
	mov	edi, OFFSET FLAT:guard variable for main::itend
	mov	QWORD PTR main::itend[rip], 0
	mov	QWORD PTR main::itend[rip+8], 0
	mov	BYTE PTR main::itend[rip+16], 0
	call	__cxa_guard_release
	jmp	.L10
	.cfi_endproc
.LFE1408:
	.size	main, .-main
	.section	.text.unlikely
.LCOLDE2:
	.section	.text.startup
.LHOTE2:
	.section	.text.unlikely
.LCOLDB3:
	.section	.text.startup
.LHOTB3:
	.p2align 4,,15
	.type	_GLOBAL__sub_I_main, @function
_GLOBAL__sub_I_main:
.LFB1609:
	.cfi_startproc
	sub	rsp, 8
	.cfi_def_cfa_offset 16
	mov	edi, OFFSET FLAT:std::__ioinit
	call	std::ios_base::Init::Init()
	mov	edx, OFFSET FLAT:__dso_handle
	mov	esi, OFFSET FLAT:std::__ioinit
	mov	edi, OFFSET FLAT:std::ios_base::Init::~Init()
	add	rsp, 8
	.cfi_def_cfa_offset 8
	jmp	__cxa_atexit
	.cfi_endproc
.LFE1609:
	.size	_GLOBAL__sub_I_main, .-_GLOBAL__sub_I_main
	.section	.text.unlikely
.LCOLDE3:
	.section	.text.startup
.LHOTE3:
	.section	.init_array,"aw"
	.align 8
	.quad	_GLOBAL__sub_I_main
	.local	main::itend
	.comm	main::itend,24,16
	.local	guard variable for main::itend
	.comm	guard variable for main::itend,8,8
	.local	std::__ioinit
	.comm	std::__ioinit,1,1
	.hidden	__dso_handle
	.ident	"GCC: (GNU) 5.2.0"
	.section	.note.GNU-stack,"",@progbits

変更されたテキスト

ファイルを開く

.file	"main.cpp"
	.intel_syntax noprefix
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"visible effect\n"
	.section	.text.unlikely,"ax",@progbits
.LCOLDB1:
	.section	.text.startup,"ax",@progbits
.LHOTB1:
	.p2align 4,,15
	.globl	main
	.type	main, @function
main:
.LFB1408:
	.cfi_startproc
	sub	rsp, 40
	.cfi_def_cfa_offset 48
	mov	rax, QWORD PTR std::cin[rip]
	mov	QWORD PTR [rsp], OFFSET FLAT:std::cin
	mov	rax, QWORD PTR [rax-24]
	test	BYTE PTR std::cin[rax+32], 5
	je	.L2
	mov	BYTE PTR [rsp+16], 0
	jmp	.L13
	.p2align 4,,10
	.p2align 3
.L7:
	mov	edx, 15
	mov	esi, OFFSET FLAT:.LC0
	mov	edi, OFFSET FLAT:std::cout
	call	std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
.L13:
	cmp	BYTE PTR [rsp+16], 0
	jne	.L7
	xor	eax, eax
	add	rsp, 40
	.cfi_remember_state
	.cfi_def_cfa_offset 8
	ret
.L2:
	.cfi_restore_state
	lea	rsi, [rsp+8]
	mov	edi, OFFSET FLAT:std::cin
	mov	BYTE PTR [rsp+16], 1
	call	std::basic_istream<char, std::char_traits<char> >& std::basic_istream<char, std::char_traits<char> >::_M_extract<double>(double&)
	mov	rax, QWORD PTR [rsp]
	mov	rdx, QWORD PTR [rax]
	mov	rdx, QWORD PTR [rdx-24]
	test	BYTE PTR [rax+32+rdx], 5
	sete	BYTE PTR [rsp+16]
	jmp	.L13
	.cfi_endproc
.LFE1408:
	.size	main, .-main
	.section	.text.unlikely
.LCOLDE1:
	.section	.text.startup
.LHOTE1:
	.section	.text.unlikely
.LCOLDB2:
	.section	.text.startup
.LHOTB2:
	.p2align 4,,15
	.type	_GLOBAL__sub_I_main, @function
_GLOBAL__sub_I_main:
.LFB1609:
	.cfi_startproc
	sub	rsp, 8
	.cfi_def_cfa_offset 16
	mov	edi, OFFSET FLAT:std::__ioinit
	call	std::ios_base::Init::Init()
	mov	edx, OFFSET FLAT:__dso_handle
	mov	esi, OFFSET FLAT:std::__ioinit
	mov	edi, OFFSET FLAT:std::ios_base::Init::~Init()
	add	rsp, 8
	.cfi_def_cfa_offset 8
	jmp	__cxa_atexit
	.cfi_endproc
.LFE1609:
	.size	_GLOBAL__sub_I_main, .-_GLOBAL__sub_I_main
	.section	.text.unlikely
.LCOLDE2:
	.section	.text.startup
.LHOTE2:
	.section	.init_array,"aw"
	.align 8
	.quad	_GLOBAL__sub_I_main
	.local	std::__ioinit
	.comm	std::__ioinit,1,1
	.hidden	__dso_handle
	.ident	"GCC: (GNU) 5.2.0"
	.section	.note.GNU-stack,"",@progbits