#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *, int *, int *);
int main() {
  int a, b, c, max;
  printf("请输入三个数：");
  scanf("%d,%d,%d", &a, &b, &c);
  max = a;
  if (max < b)
    max = b;
  if (max < c)
    max = c;
  printf("max=%d", max);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xed2(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0xc(%rbp),%rdx
lea    -0x10(%rbp),%rcx
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    116d <main+0x4d>
mov    -0xc(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x10(%rbp),%eax
jge    117f <main+0x5f>
mov    -0x10(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%esi
lea    0xe96(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
sub    $0x18,%rsp
lea    0xed5(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xedd(%rip),%rdi
lea    0x14(%rsp),%rsi
lea    0x10(%rsp),%rdx
lea    0xc(%rsp),%rcx
call   1040 <scanf@plt>
mov    0x14(%rsp),%esi
mov    0x10(%rsp),%eax
cmp    %eax,%esi
cmovl  %eax,%esi
mov    0xc(%rsp),%eax
cmp    %eax,%esi
cmovl  %eax,%esi
lea    0xeb5(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x18,%rsp
ret

LLVM IR (-O0):
@.str = [22 x i8] c"\E8\AF\B7\E8\BE\93\E5\85\A5\E4\B8\89\E4\B8\AA\E6\95\B0\EF\BC\9A\00"
@.str.1 = [9 x i8] c"%d,%d,%d\00"
@.str.2 = [7 x i8] c"max=%d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
store i32 0, i32* %1
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
%7 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32* %2, i32* %3, i32* %4)
%8 = load i32, i32* %2
store i32 %8, i32* %5
%9 = load i32, i32* %5
%10 = load i32, i32* %3
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %14
12: ; preds = %0
%13 = load i32, i32* %3
store i32 %13, i32* %5
br label %14
14: ; preds = %12, %0
%15 = load i32, i32* %5
%16 = load i32, i32* %4
%17 = icmp slt i32 %15, %16
br i1 %17, label %18, label %20
18: ; preds = %14
%19 = load i32, i32* %4
store i32 %19, i32* %5
br label %20
20: ; preds = %18, %14
%21 = load i32, i32* %5
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i32 %21)
ret i32 0
}

LLVM IR (-O2):
@.str = [22 x i8] c"\E8\AF\B7\E8\BE\93\E5\85\A5\E4\B8\89\E4\B8\AA\E6\95\B0\EF\BC\9A\00"
@.str.1 = [9 x i8] c"%d,%d,%d\00"
@.str.2 = [7 x i8] c"max=%d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = bitcast i32* %1 to i8*
%5 = bitcast i32* %2 to i8*
%6 = bitcast i32* %3 to i8*
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32* %1, i32* %2, i32* %3)
%9 = load i32, i32* %1
%10 = load i32, i32* %2
%11 = icmp slt i32 %9, %10
%12 = select i1 %11, i32 %10, i32 %9
%13 = load i32, i32* %3
%14 = icmp slt i32 %12, %13
%15 = select i1 %14, i32 %13, i32 %12
%16 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i32 %15)
ret i32 0
}