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x86 memcmp 4+2+1 vs 4+4 for 7

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.LCPI0_0:

.byte 15 # 0xf

.byte 14 # 0xe

.byte 13 # 0xd

.byte 12 # 0xc

.byte 11 # 0xb

.byte 10 # 0xa

.byte 9 # 0x9

.byte 8 # 0x8

.byte 7 # 0x7

.byte 6 # 0x6

.byte 5 # 0x5

.byte 4 # 0x4

.byte 3 # 0x3

.byte 2 # 0x2

.byte 1 # 0x1

.byte 0 # 0x0

memcmp: # @memcmp

xor eax, eax

cmp rdx, 8

ja .LBB0_19

lea rcx, [rip + .LJTI0_0]

movsxd rdx, dword ptr [rcx + 4*rdx]

add rdx, rcx

jmp rdx

.LBB0_2:

movzx eax, byte ptr [rdi]

movzx ecx, byte ptr [rsi]

sub eax, ecx

ret

.LBB0_19:

cmp rdx, 16

ja .LBB0_23

mov rcx, qword ptr [rdi]

mov r8, qword ptr [rsi]

cmp rcx, r8

jne .LBB0_21

mov rcx, qword ptr [rdi + rdx - 8]

mov rdx, qword ptr [rsi + rdx - 8]

cmp rcx, rdx

je .LBB0_34

jmp .LBB0_17

.LBB0_3:

movbe ax, word ptr [rdi]

movzx eax, ax

movbe cx, word ptr [rsi]

movzx ecx, cx

sub eax, ecx

ret

.LBB0_5:

movbe ax, word ptr [rdi]

movzx eax, ax

movbe cx, word ptr [rsi]

movzx ecx, cx

sub eax, ecx

je .LBB0_6

.LBB0_34:

ret

.LBB0_7:

movbe eax, dword ptr [rdi]

movbe ecx, dword ptr [rsi]

Text moved to lines 100-103

sub rax, rcx

movzx ecx, ax

shr rax

or eax, ecx

ret

.LBB0_8:

jmp .LBB0_8

.LBB0_9:

movbe eax, dword ptr [rdi]

movbe ecx, dword ptr [rsi]

sub rax, rcx

movzx ecx, ax

shr rax

or eax, ecx

jne .LBB0_34

movzx eax, byte ptr [rdi + 4]

movzx ecx, byte ptr [rsi + 4]

sub eax, ecx

ret

.LBB0_10:

.LBB0_11:

movbe eax, dword ptr [rdi]

movbe ecx, dword ptr [rsi]

sub rax, rcx

movzx ecx, ax

shr rax

or eax, ecx

jne .LBB0_34

movbe ax, word ptr [rdi + 4]

movzx eax, ax

movbe cx, word ptr [rsi + 4]

movzx ecx, cx

sub eax, ecx

ret

.LBB0_12:

.LBB0_13:

movbe eax, dword ptr [rdi]

movbe ecx, dword ptr [rsi]

sub rax, rcx

movzx ecx, ax

shr rax

or eax, ecx

Diferenças salvas

Texto original

Abrir arquivo

.LCPI0_0:
  .byte 15 # 0xf
  .byte 14 # 0xe
  .byte 13 # 0xd
  .byte 12 # 0xc
  .byte 11 # 0xb
  .byte 10 # 0xa
  .byte 9 # 0x9
  .byte 8 # 0x8
  .byte 7 # 0x7
  .byte 6 # 0x6
  .byte 5 # 0x5
  .byte 4 # 0x4
  .byte 3 # 0x3
  .byte 2 # 0x2
  .byte 1 # 0x1
  .byte 0 # 0x0
memcmp: # @memcmp
  xor eax, eax
  cmp rdx, 8
  ja .LBB0_19
  lea rcx, [rip + .LJTI0_0]
  movsxd rdx, dword ptr [rcx + 4*rdx]
  add rdx, rcx
  jmp rdx
.LBB0_2:
  movzx eax, byte ptr [rdi]
  movzx ecx, byte ptr [rsi]
  sub eax, ecx
  ret
.LBB0_19:
  cmp rdx, 16
  ja .LBB0_23
  mov rcx, qword ptr [rdi]
  mov r8, qword ptr [rsi]
  cmp rcx, r8
  jne .LBB0_21
  mov rcx, qword ptr [rdi + rdx - 8]
  mov rdx, qword ptr [rsi + rdx - 8]
  cmp rcx, rdx
  je .LBB0_34
  jmp .LBB0_17
.LBB0_3:
  movbe ax, word ptr [rdi]
  movzx eax, ax
  movbe cx, word ptr [rsi]
  movzx ecx, cx
  sub eax, ecx
  ret
.LBB0_5:
  movbe ax, word ptr [rdi]
  movzx eax, ax
  movbe cx, word ptr [rsi]
  movzx ecx, cx
  sub eax, ecx
  je .LBB0_6
.LBB0_34:
  ret
.LBB0_7:
  movbe eax, dword ptr [rdi]
  movbe ecx, dword ptr [rsi]
  sub rax, rcx
  movzx ecx, ax
  shr rax
  or eax, ecx
  ret
.LBB0_8:
  movbe eax, dword ptr [rdi]
  movbe ecx, dword ptr [rsi]
  sub rax, rcx
  movzx ecx, ax
  shr rax
  or eax, ecx
  jne .LBB0_34
  movzx eax, byte ptr [rdi + 4]
  movzx ecx, byte ptr [rsi + 4]
  sub eax, ecx
  ret
.LBB0_10:
  movbe eax, dword ptr [rdi]
  movbe ecx, dword ptr [rsi]
  sub rax, rcx
  movzx ecx, ax
  shr rax
  or eax, ecx
  jne .LBB0_34
  movbe ax, word ptr [rdi + 4]
  movzx eax, ax
  movbe cx, word ptr [rsi + 4]
  movzx ecx, cx
  sub eax, ecx
  ret
.LBB0_12:
  movbe eax, dword ptr [rdi]
  movbe ecx, dword ptr [rsi]
  sub rax, rcx
  movzx ecx, ax
  shr rax
  or eax, ecx
  jne .LBB0_34
  movbe ax, word ptr [rdi + 4]
  movzx eax, ax
  movbe cx, word ptr [rsi + 4]
  movzx ecx, cx
  sub eax, ecx
  jne .LBB0_34
  movzx eax, byte ptr [rdi + 6]
  movzx ecx, byte ptr [rsi + 6]
  sub eax, ecx
  ret
.LBB0_15:
  mov rcx, qword ptr [rdi]
  mov rdx, qword ptr [rsi]
  cmp rcx, rdx
  je .LBB0_34
.LBB0_17:
  bswap rcx
  bswap rdx
  xor eax, eax
  cmp rcx, rdx
  sbb eax, eax
  or eax, 1
  ret
.LBB0_23:
  cmp rdx, 384
  jae .LBB0_24
.LBB0_28:
  add rdx, -16
  xor eax, eax
.LBB0_29: # =>This Inner Loop Header: Depth=1
  vmovdqu xmm0, xmmword ptr [rdi + rax]
  vmovdqu xmm1, xmmword ptr [rsi + rax]
  vpxor xmm2, xmm1, xmm0
  vptest xmm2, xmm2
  jne .LBB0_32
  add rax, 16
  cmp rax, rdx
  jb .LBB0_29
  vmovdqu xmm0, xmmword ptr [rdi + rdx]
  vmovdqu xmm1, xmmword ptr [rsi + rdx]
  vpxor xmm2, xmm1, xmm0
  xor eax, eax
  vptest xmm2, xmm2
  je .LBB0_34
.LBB0_32:
  vpmaxub xmm2, xmm1, xmm0
  vpcmpeqb xmm1, xmm1, xmm2
  vmovdqa xmm3, xmmword ptr [rip + .LCPI0_0] # xmm3 = [15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0]
  vpshufb xmm1, xmm1, xmm3
  vpmovmskb ecx, xmm1
  vpcmpeqb xmm0, xmm0, xmm2
  vpshufb xmm0, xmm0, xmm3
  vpmovmskb eax, xmm0
  sub eax, ecx
  ret
.LBB0_6:
  movzx eax, byte ptr [rdi + 2]
  movzx ecx, byte ptr [rsi + 2]
  sub eax, ecx
  ret
.LBB0_21:
  bswap rcx
  bswap r8
  xor eax, eax
  cmp rcx, r8
  sbb eax, eax
  or eax, 1
  ret
.LBB0_24:
  mov ecx, edi
  and ecx, 15
  je .LBB0_28
  vmovdqu xmm0, xmmword ptr [rdi]
  vmovdqu xmm1, xmmword ptr [rsi]
  vpxor xmm2, xmm1, xmm0
  vptest xmm2, xmm2
  je .LBB0_27
  vpmaxub xmm2, xmm1, xmm0
  vpcmpeqb xmm1, xmm1, xmm2
  vmovdqa xmm3, xmmword ptr [rip + .LCPI0_0] # xmm3 = [15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0]
  vpshufb xmm1, xmm1, xmm3
  vpmovmskb r8d, xmm1
  vpcmpeqb xmm0, xmm0, xmm2
  vpshufb xmm0, xmm0, xmm3
  vpmovmskb eax, xmm0
  sub eax, r8d
  jne .LBB0_34
.LBB0_27:
  mov eax, 16
  sub rax, rcx
  add rdi, rax
  add rsi, rax
  sub rdx, rax
  jmp .LBB0_28
.LJTI0_0:
  .long .LBB0_34-.LJTI0_0
  .long .LBB0_2-.LJTI0_0
  .long .LBB0_3-.LJTI0_0
  .long .LBB0_5-.LJTI0_0
  .long .LBB0_7-.LJTI0_0
  .long .LBB0_8-.LJTI0_0
  .long .LBB0_10-.LJTI0_0
  .long .LBB0_12-.LJTI0_0
  .long .LBB0_15-.LJTI0_0

Texto alterado

Abrir arquivo

.LCPI0_0:
  .byte 15 # 0xf
  .byte 14 # 0xe
  .byte 13 # 0xd
  .byte 12 # 0xc
  .byte 11 # 0xb
  .byte 10 # 0xa
  .byte 9 # 0x9
  .byte 8 # 0x8
  .byte 7 # 0x7
  .byte 6 # 0x6
  .byte 5 # 0x5
  .byte 4 # 0x4
  .byte 3 # 0x3
  .byte 2 # 0x2
  .byte 1 # 0x1
  .byte 0 # 0x0
memcmp: # @memcmp
  xor eax, eax
  cmp rdx, 8
  ja .LBB0_19
  lea rcx, [rip + .LJTI0_0]
  movsxd rdx, dword ptr [rcx + 4*rdx]
  add rdx, rcx
  jmp rdx
.LBB0_2:
  movzx eax, byte ptr [rdi]
  movzx ecx, byte ptr [rsi]
  sub eax, ecx
  ret
.LBB0_19:
  cmp rdx, 16
  ja .LBB0_23
  mov rcx, qword ptr [rdi]
  mov r8, qword ptr [rsi]
  cmp rcx, r8
  jne .LBB0_21
  mov rcx, qword ptr [rdi + rdx - 8]
  mov rdx, qword ptr [rsi + rdx - 8]
  cmp rcx, rdx
  je .LBB0_34
  jmp .LBB0_17
.LBB0_3:
  movbe ax, word ptr [rdi]
  movzx eax, ax
  movbe cx, word ptr [rsi]
  movzx ecx, cx
  sub eax, ecx
  ret
.LBB0_5:
  movbe ax, word ptr [rdi]
  movzx eax, ax
  movbe cx, word ptr [rsi]
  movzx ecx, cx
  sub eax, ecx
  je .LBB0_6
.LBB0_34:
  ret
.LBB0_7:
  movbe eax, dword ptr [rdi]
  movbe ecx, dword ptr [rsi]
  jmp .LBB0_8
.LBB0_9:
  movbe eax, dword ptr [rdi]
  movbe ecx, dword ptr [rsi]
  sub rax, rcx
  movzx ecx, ax
  shr rax
  or eax, ecx
  jne .LBB0_34
  movzx eax, byte ptr [rdi + 4]
  movzx ecx, byte ptr [rsi + 4]
  sub eax, ecx
  ret
.LBB0_11:
  movbe eax, dword ptr [rdi]
  movbe ecx, dword ptr [rsi]
  sub rax, rcx
  movzx ecx, ax
  shr rax
  or eax, ecx
  jne .LBB0_34
  movbe ax, word ptr [rdi + 4]
  movzx eax, ax
  movbe cx, word ptr [rsi + 4]
  movzx ecx, cx
  sub eax, ecx
  ret
.LBB0_13:
  movbe eax, dword ptr [rdi]
  movbe ecx, dword ptr [rsi]
  sub rax, rcx
  movzx ecx, ax
  shr rax
  or eax, ecx
  jne .LBB0_34
  movbe eax, dword ptr [rdi + 3]
  movbe ecx, dword ptr [rsi + 3]
.LBB0_8:
  sub rax, rcx
  movzx ecx, ax
  shr rax
  or eax, ecx
  ret
.LBB0_15:
  mov rcx, qword ptr [rdi]
  mov rdx, qword ptr [rsi]
  cmp rcx, rdx
  je .LBB0_34
.LBB0_17:
  bswap rcx
  bswap rdx
  xor eax, eax
  cmp rcx, rdx
  sbb eax, eax
  or eax, 1
  ret
.LBB0_23:
  cmp rdx, 384
  jae .LBB0_24
.LBB0_28:
  add rdx, -16
  xor eax, eax
.LBB0_29: # =>This Inner Loop Header: Depth=1
  vmovdqu xmm0, xmmword ptr [rdi + rax]
  vmovdqu xmm1, xmmword ptr [rsi + rax]
  vpxor xmm2, xmm1, xmm0
  vptest xmm2, xmm2
  jne .LBB0_32
  add rax, 16
  cmp rax, rdx
  jb .LBB0_29
  vmovdqu xmm0, xmmword ptr [rdi + rdx]
  vmovdqu xmm1, xmmword ptr [rsi + rdx]
  vpxor xmm2, xmm1, xmm0
  xor eax, eax
  vptest xmm2, xmm2
  je .LBB0_34
.LBB0_32:
  vpmaxub xmm2, xmm1, xmm0
  vpcmpeqb xmm1, xmm1, xmm2
  vmovdqa xmm3, xmmword ptr [rip + .LCPI0_0] # xmm3 = [15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0]
  vpshufb xmm1, xmm1, xmm3
  vpmovmskb ecx, xmm1
  vpcmpeqb xmm0, xmm0, xmm2
  vpshufb xmm0, xmm0, xmm3
  vpmovmskb eax, xmm0
  sub eax, ecx
  ret
.LBB0_6:
  movzx eax, byte ptr [rdi + 2]
  movzx ecx, byte ptr [rsi + 2]
  sub eax, ecx
  ret
.LBB0_21:
  bswap rcx
  bswap r8
  xor eax, eax
  cmp rcx, r8
  sbb eax, eax
  or eax, 1
  ret
.LBB0_24:
  mov ecx, edi
  and ecx, 15
  je .LBB0_28
  vmovdqu xmm0, xmmword ptr [rdi]
  vmovdqu xmm1, xmmword ptr [rsi]
  vpxor xmm2, xmm1, xmm0
  vptest xmm2, xmm2
  je .LBB0_27
  vpmaxub xmm2, xmm1, xmm0
  vpcmpeqb xmm1, xmm1, xmm2
  vmovdqa xmm3, xmmword ptr [rip + .LCPI0_0] # xmm3 = [15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0]
  vpshufb xmm1, xmm1, xmm3
  vpmovmskb r8d, xmm1
  vpcmpeqb xmm0, xmm0, xmm2
  vpshufb xmm0, xmm0, xmm3
  vpmovmskb eax, xmm0
  sub eax, r8d
  jne .LBB0_34
.LBB0_27:
  mov eax, 16
  sub rax, rcx
  add rdi, rax
  add rsi, rax
  sub rdx, rax
  jmp .LBB0_28
.LJTI0_0:
  .long .LBB0_34-.LJTI0_0
  .long .LBB0_2-.LJTI0_0
  .long .LBB0_3-.LJTI0_0
  .long .LBB0_5-.LJTI0_0
  .long .LBB0_7-.LJTI0_0
  .long .LBB0_9-.LJTI0_0
  .long .LBB0_11-.LJTI0_0
  .long .LBB0_13-.LJTI0_0
  .long .LBB0_15-.LJTI0_0