int main(vodi) {
  int na, nb;
  puts("请输入两个整数");
  printf("整数1 :");
  scanf("%d", &na);
  printf("整数2 :");
  scanf("%d", &nb);
  printf("大的整数的值是  %d \n", maxof(na, nb));
  return (0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
lea    0xea7(%rip),%rdi
mov    $0x0,%al
call   1030 <puts@plt>
lea    0xeaf(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xeab(%rip),%rdi
lea    -0xc(%rbp),%rsi
mov    $0x0,%al
call   1050 <scanf@plt>
lea    0xe9c(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xe8b(%rip),%rdi
lea    -0x10(%rbp),%rsi
mov    $0x0,%al
call   1050 <scanf@plt>
mov    -0xc(%rbp),%edi
mov    -0x10(%rbp),%esi
mov    $0x0,%al
call   1060 <maxof@plt>
mov    %eax,%esi
lea    0xe77(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xeb4(%rip),%rdi
xor    %eax,%eax
call   1030 <puts@plt>
lea    0xebc(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xeb8(%rip),%rbx
lea    0xc(%rsp),%rsi
mov    %rbx,%rdi
xor    %eax,%eax
call   1050 <scanf@plt>
lea    0xea5(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0x8(%rsp),%rsi
mov    %rbx,%rdi
xor    %eax,%eax
call   1050 <scanf@plt>
mov    0xc(%rsp),%edi
mov    0x8(%rsp),%esi
xor    %eax,%eax
call   1060 <maxof@plt>
lea    0xe83(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [22 x i8] c"\E8\AF\B7\E8\BE\93\E5\85\A5\E4\B8\A4\E4\B8\AA\E6\95\B4\E6\95\B0\00"
@.str.1 = [10 x i8] c"\E6\95\B4\E6\95\B01 :\00"
@.str.2 = [3 x i8] c"%d\00"
@.str.3 = [10 x i8] c"\E6\95\B4\E6\95\B02 :\00"
@.str.4 = [28 x i8] c"\E5\A4\A7\E7\9A\84\E6\95\B4\E6\95\B0\E7\9A\84\E5\80\BC\E6\98\AF %d \0A\00"
define i32 @main(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
store i32 0, i32* %2
store i32 %0, i32* %3
%6 = call i32 (i8*, ...) bitcast (i32 (...)* @puts to i32 (i8*, ...)*)(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0))
%8 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %4)
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0))
%10 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %5)
%11 = load i32, i32* %4
%12 = load i32, i32* %5
%13 = call i32 (i32, i32, ...) bitcast (i32 (...)* @maxof to i32 (i32, i32, ...)*)(i32 %11, i32 %12)
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.4, i64 0, i64 0), i32 %13)
ret i32 0
}

LLVM IR (-O2):
@.str = [22 x i8] c"\E8\AF\B7\E8\BE\93\E5\85\A5\E4\B8\A4\E4\B8\AA\E6\95\B4\E6\95\B0\00"
@.str.1 = [10 x i8] c"\E6\95\B4\E6\95\B01 :\00"
@.str.2 = [3 x i8] c"%d\00"
@.str.3 = [10 x i8] c"\E6\95\B4\E6\95\B02 :\00"
@.str.4 = [28 x i8] c"\E5\A4\A7\E7\9A\84\E6\95\B4\E6\95\B0\E7\9A\84\E5\80\BC\E6\98\AF %d \0A\00"
define i32 @main(i32 %0) {
%2 = alloca i32
%3 = alloca i32
%4 = bitcast i32* %2 to i8*
%5 = bitcast i32* %3 to i8*
%6 = tail call i32 (i8*, ...) bitcast (i32 (...)* @puts to i32 (i8*, ...)*)(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0))
%8 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %2)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0))
%10 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %3)
%11 = load i32, i32* %2
%12 = load i32, i32* %3
%13 = call i32 (i32, i32, ...) bitcast (i32 (...)* @maxof to i32 (i32, i32, ...)*)(i32 %11, i32 %12)
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str.4, i64 0, i64 0), i32 %13)
ret i32 0
}