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138 行

.text

.file ""

.globl foo # -- Begin function foo

.p2align 4, 0x90

.type foo,@function

foo: # @foo

.cfi_startproc

# %bb.0: # %entry

pushq %rbp

.cfi_def_cfa_offset 16

pushq %rbx

.cfi_def_cfa_offset 24

pushq %rax

.cfi_def_cfa_offset 32

.cfi_offset %rbx, -24

.cfi_offset %rbp, -16

movl $1, %eax

cmpl $1, %edi

je .LBB0_3

# %bb.1: # %lor.lhs.false

movl %edi, %ebx

testl %edi, %edi

je .LBB0_3

# %bb.2: # %if.else

leal -1(%rbx), %edi

callq foo

movl %eax, %ebp

addl $-2, %ebx

movl %ebx, %edi

callq foo

addl %ebp, %eax

.LBB0_3: # %return

addq $8, %rsp

.cfi_def_cfa_offset 24

popq %rbx

.cfi_def_cfa_offset 16

popq %rbp

.cfi_def_cfa_offset 8

retq

.Lfunc_end0:

.size foo, .Lfunc_end0-foo

.cfi_endproc

# -- End function

.globl main # -- Begin function main

.p2align 4, 0x90

.type main,@function

main: # @main

.cfi_startproc

# %bb.0: # %entry

pushq %rbp

.cfi_def_cfa_offset 16

pushq %r14

pushq %r15

.cfi_def_cfa_offset 24

pushq %rbx

pushq %r14

.cfi_def_cfa_offset 32

.cfi_offset %rbx, -32

pushq %r13

.cfi_offset %r14, -24

.cfi_def_cfa_offset 40

pushq %r12

.cfi_def_cfa_offset 48

pushq %rbx

.cfi_def_cfa_offset 56

pushq %rax

.cfi_def_cfa_offset 64

.cfi_offset %rbx, -56

.cfi_offset %r12, -48

.cfi_offset %r13, -40

.cfi_offset %r14, -32

.cfi_offset %r15, -24

.cfi_offset %rbp, -16

movl $50000, %r14d # imm = 0xC350

xorl %r13d, %r13d

xorl %ebx, %ebx

movl $50000, %r15d # imm = 0xC350

movl $9999, %ebp # imm = 0x270F

movl $9999, %r14d # imm = 0x270F

.p2align 4, 0x90

.LBB1_1: # %while.cond

# =>This Inner Loop Header: Depth=1

movl %ebp, %eax

movl %r14d, %eax

cltd

idivl %r14d

idivl %r15d

movl %edx, %r12d

movl %r13d, 4(%rsp) # 4-byte Spill

movslq %edx, %rdi

imulq $1717986919, %rdi, %rcx # imm = 0x66666667

imulq $1717986919, %rdi, %rbp # imm = 0x66666667

movq %rcx, %rdx

movq %rbp, %rbx

shrq $63, %rdx

shrq $63, %rbx

sarq $33, %rcx

sarq $33, %rbp

addl %edx, %ecx

leal (%rbx,%rbp), %ecx

leal (%rcx,%rcx,4), %ecx

subl %ecx, %edi

movl %eax, %ebp

movl %eax, %r14d

# kill: def $edi killed $edi killed $rdi

callq foo

cmpl $1, %r14d

movl %eax, %r13d

jne .LBB1_3

addl 4(%rsp), %r13d # 4-byte Folded Reload

# %bb.2: # in Loop: Header=BB1_1 Depth=1

cmpl $1, %r15d

movl $3, %ecx

je .LBB1_2

jmp .LBB1_4

# %bb.3: # %if.end

.p2align 4, 0x90

.LBB1_3: # %if.end

# in Loop: Header=BB1_1 Depth=1

imull %eax, %ebp

xorl %ecx, %ecx

.LBB1_4: # %cleanup

# in Loop: Header=BB1_1 Depth=1

addl %eax, %ebx

testl %ecx, %ecx

jne .LBB1_6

# %bb.5: # %cleanup.cont

# in Loop: Header=BB1_1 Depth=1

addl $-1, %r14d

addl %ebx, %ebp

leal (%rbp,%rbp,4), %eax

subl %eax, %r12d

movl %r12d, %edi

callq foo

imull %eax, %r14d

addl $-1, %r15d

jmp .LBB1_1

.LBB1_6: # %while.end

.LBB1_2: # %if.then

movl $.L.str, %edi

movl %ebx, %esi

movl %r13d, %esi

xorl %eax, %eax

callq printf

xorl %eax, %eax

addq $8, %rsp

.cfi_def_cfa_offset 56

popq %rbx

.cfi_def_cfa_offset 48

popq %r12

.cfi_def_cfa_offset 40

popq %r13

.cfi_def_cfa_offset 32

popq %r14

.cfi_def_cfa_offset 24

popq %r14

popq %r15

.cfi_def_cfa_offset 16

popq %rbp

.cfi_def_cfa_offset 8

retq

.Lfunc_end1:

.size main, .Lfunc_end1-main

.cfi_endproc

# -- End function

.type .L.str,@object # @.str

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

.L.str:

.asciz "%d\n"

.size .L.str, 4

.ident "clang version 14.0.0 (https://github.com/llvm/llvm-project edff0070a126d9a27263958dbb22133f4ed6526e)"

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

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.text
	.file	""
	.globl	foo                             # -- Begin function foo
	.p2align	4, 0x90
	.type	foo,@function
foo:                                    # @foo
	.cfi_startproc
# %bb.0:                                # %entry
	pushq	%rbp
	.cfi_def_cfa_offset 16
	pushq	%rbx
	.cfi_def_cfa_offset 24
	pushq	%rax
	.cfi_def_cfa_offset 32
	.cfi_offset %rbx, -24
	.cfi_offset %rbp, -16
	movl	$1, %eax
	cmpl	$1, %edi
	je	.LBB0_3
# %bb.1:                                # %lor.lhs.false
	movl	%edi, %ebx
	testl	%edi, %edi
	je	.LBB0_3
# %bb.2:                                # %if.else
	leal	-1(%rbx), %edi
	callq	foo
	movl	%eax, %ebp
	addl	$-2, %ebx
	movl	%ebx, %edi
	callq	foo
	addl	%ebp, %eax
.LBB0_3:                                # %return
	addq	$8, %rsp
	.cfi_def_cfa_offset 24
	popq	%rbx
	.cfi_def_cfa_offset 16
	popq	%rbp
	.cfi_def_cfa_offset 8
	retq
.Lfunc_end0:
	.size	foo, .Lfunc_end0-foo
	.cfi_endproc
                                        # -- End function
	.globl	main                            # -- Begin function main
	.p2align	4, 0x90
	.type	main,@function
main:                                   # @main
	.cfi_startproc
# %bb.0:                                # %entry
	pushq	%rbp
	.cfi_def_cfa_offset 16
	pushq	%r14
	.cfi_def_cfa_offset 24
	pushq	%rbx
	.cfi_def_cfa_offset 32
	.cfi_offset %rbx, -32
	.cfi_offset %r14, -24
	.cfi_offset %rbp, -16
	movl	$50000, %r14d                   # imm = 0xC350
	xorl	%ebx, %ebx
	movl	$9999, %ebp                     # imm = 0x270F
	.p2align	4, 0x90
.LBB1_1:                                # %while.cond
                                        # =>This Inner Loop Header: Depth=1
	movl	%ebp, %eax
	cltd
	idivl	%r14d
	movslq	%edx, %rdi
	imulq	$1717986919, %rdi, %rcx         # imm = 0x66666667
	movq	%rcx, %rdx
	shrq	$63, %rdx
	sarq	$33, %rcx
	addl	%edx, %ecx
	leal	(%rcx,%rcx,4), %ecx
	subl	%ecx, %edi
	movl	%eax, %ebp
                                        # kill: def $edi killed $edi killed $rdi
	callq	foo
	cmpl	$1, %r14d
	jne	.LBB1_3
# %bb.2:                                #   in Loop: Header=BB1_1 Depth=1
	movl	$3, %ecx
	jmp	.LBB1_4
	.p2align	4, 0x90
.LBB1_3:                                # %if.end
                                        #   in Loop: Header=BB1_1 Depth=1
	imull	%eax, %ebp
	xorl	%ecx, %ecx
.LBB1_4:                                # %cleanup
                                        #   in Loop: Header=BB1_1 Depth=1
	addl	%eax, %ebx
	testl	%ecx, %ecx
	jne	.LBB1_6
# %bb.5:                                # %cleanup.cont
                                        #   in Loop: Header=BB1_1 Depth=1
	addl	$-1, %r14d
	jmp	.LBB1_1
.LBB1_6:                                # %while.end
	movl	$.L.str, %edi
	movl	%ebx, %esi
	xorl	%eax, %eax
	callq	printf
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 24
	popq	%r14
	.cfi_def_cfa_offset 16
	popq	%rbp
	.cfi_def_cfa_offset 8
	retq
.Lfunc_end1:
	.size	main, .Lfunc_end1-main
	.cfi_endproc
                                        # -- End function
	.type	.L.str,@object                  # @.str
	.section	.rodata.str1.1,"aMS",@progbits,1
.L.str:
	.asciz	"%d\n"
	.size	.L.str, 4

.ident	"clang version 14.0.0 (https://github.com/llvm/llvm-project edff0070a126d9a27263958dbb22133f4ed6526e)"
	.section	".note.GNU-stack","",@progbits

更改后文本

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.text
	.file	""
	.globl	foo                             # -- Begin function foo
	.p2align	4, 0x90
	.type	foo,@function
foo:                                    # @foo
	.cfi_startproc
# %bb.0:                                # %entry
	pushq	%rbp
	.cfi_def_cfa_offset 16
	pushq	%rbx
	.cfi_def_cfa_offset 24
	pushq	%rax
	.cfi_def_cfa_offset 32
	.cfi_offset %rbx, -24
	.cfi_offset %rbp, -16
	movl	$1, %eax
	cmpl	$1, %edi
	je	.LBB0_3
# %bb.1:                                # %lor.lhs.false
	movl	%edi, %ebx
	testl	%edi, %edi
	je	.LBB0_3
# %bb.2:                                # %if.else
	leal	-1(%rbx), %edi
	callq	foo
	movl	%eax, %ebp
	addl	$-2, %ebx
	movl	%ebx, %edi
	callq	foo
	addl	%ebp, %eax
.LBB0_3:                                # %return
	addq	$8, %rsp
	.cfi_def_cfa_offset 24
	popq	%rbx
	.cfi_def_cfa_offset 16
	popq	%rbp
	.cfi_def_cfa_offset 8
	retq
.Lfunc_end0:
	.size	foo, .Lfunc_end0-foo
	.cfi_endproc
                                        # -- End function
	.globl	main                            # -- Begin function main
	.p2align	4, 0x90
	.type	main,@function
main:                                   # @main
	.cfi_startproc
# %bb.0:                                # %entry
	pushq	%rbp
	.cfi_def_cfa_offset 16
	pushq	%r15
	.cfi_def_cfa_offset 24
	pushq	%r14
	.cfi_def_cfa_offset 32
	pushq	%r13
	.cfi_def_cfa_offset 40
	pushq	%r12
	.cfi_def_cfa_offset 48
	pushq	%rbx
	.cfi_def_cfa_offset 56
	pushq	%rax
	.cfi_def_cfa_offset 64
	.cfi_offset %rbx, -56
	.cfi_offset %r12, -48
	.cfi_offset %r13, -40
	.cfi_offset %r14, -32
	.cfi_offset %r15, -24
	.cfi_offset %rbp, -16
	xorl	%r13d, %r13d
	movl	$50000, %r15d                   # imm = 0xC350
	movl	$9999, %r14d                    # imm = 0x270F
	.p2align	4, 0x90
.LBB1_1:                                # %while.cond
                                        # =>This Inner Loop Header: Depth=1
	movl	%r14d, %eax
	cltd
	idivl	%r15d
	movl	%edx, %r12d
	movl	%r13d, 4(%rsp)                  # 4-byte Spill
	movslq	%edx, %rdi
	imulq	$1717986919, %rdi, %rbp         # imm = 0x66666667
	movq	%rbp, %rbx
	shrq	$63, %rbx
	sarq	$33, %rbp
	leal	(%rbx,%rbp), %ecx
	leal	(%rcx,%rcx,4), %ecx
	subl	%ecx, %edi
	movl	%eax, %r14d
                                        # kill: def $edi killed $edi killed $rdi
	callq	foo
	movl	%eax, %r13d
	addl	4(%rsp), %r13d                  # 4-byte Folded Reload
	cmpl	$1, %r15d
	je	.LBB1_2
# %bb.3:                                # %if.end
                                        #   in Loop: Header=BB1_1 Depth=1
	addl	%ebx, %ebp
	leal	(%rbp,%rbp,4), %eax
	subl	%eax, %r12d
	movl	%r12d, %edi
	callq	foo
	imull	%eax, %r14d
	addl	$-1, %r15d
	jmp	.LBB1_1
.LBB1_2:                                # %if.then
	movl	$.L.str, %edi
	movl	%r13d, %esi
	xorl	%eax, %eax
	callq	printf
	xorl	%eax, %eax
	addq	$8, %rsp
	.cfi_def_cfa_offset 56
	popq	%rbx
	.cfi_def_cfa_offset 48
	popq	%r12
	.cfi_def_cfa_offset 40
	popq	%r13
	.cfi_def_cfa_offset 32
	popq	%r14
	.cfi_def_cfa_offset 24
	popq	%r15
	.cfi_def_cfa_offset 16
	popq	%rbp
	.cfi_def_cfa_offset 8
	retq
.Lfunc_end1:
	.size	main, .Lfunc_end1-main
	.cfi_endproc
                                        # -- End function
	.type	.L.str,@object                  # @.str
	.section	.rodata.str1.1,"aMS",@progbits,1
.L.str:
	.asciz	"%d\n"
	.size	.L.str, 4

.ident	"clang version 14.0.0 (https://github.com/llvm/llvm-project edff0070a126d9a27263958dbb22133f4ed6526e)"
	.section	".note.GNU-stack","",@progbits