void see_the_test_result() {
  int a[10];
  int i;
  subcall(&a, 10);
  printf("\n");
  for (i = 0; i < 10; i++)
    printf("%5d", a[i]);
  printf("\n");
  a == &a ? printf("a==&a[0]") : printf("a != &a[0]");
}


x86 assembly (clang, -O0):
<see_the_test_result>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
lea    -0x30(%rbp),%rdi
mov    $0xa,%esi
mov    $0x0,%al
call   1040 <subcall@plt>
lea    0xec1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x34(%rbp)
cmpl   $0xa,-0x34(%rbp)
jge    117b <see_the_test_result+0x5b>
movslq -0x34(%rbp),%rax
mov    -0x30(%rbp,%rax,4),%esi
lea    0xe9c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x34(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x34(%rbp)
jmp    114d <see_the_test_result+0x2d>
lea    0xe7e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe76(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<see_the_test_result>:
push   %rbx
sub    $0x30,%rsp
mov    %rsp,%rdi
mov    $0xa,%esi
xor    %eax,%eax
call   1050 <subcall@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
mov    (%rsp),%esi
lea    0xea8(%rip),%rbx
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x4(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x8(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0xc(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x10(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x14(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x18(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x1c(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x20(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x24(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    0xe13(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x30,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [2 x i8] c"\0A\00"
@.str.1 = [4 x i8] c"%5d\00"
@.str.2 = [9 x i8] c"a==&a[0]\00"
define void @see_the_test_result() {
%1 = alloca [10 x i32]
%2 = alloca i32
%3 = call i32 ([10 x i32]*, i32, ...) bitcast (i32 (...)* @subcall to i32 ([10 x i32]*, i32, ...)*)([10 x i32]* %1, i32 10)
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %2
br label %5
5: ; preds = %14, %0
%6 = load i32, i32* %2
%7 = icmp slt i32 %6, 10
br i1 %7, label %8, label %17
8: ; preds = %5
%9 = load i32, i32* %2
%10 = sext i32 %9 to i64
%11 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 %10
%12 = load i32, i32* %11
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %12)
br label %14
14: ; preds = %8
%15 = load i32, i32* %2
%16 = add nsw i32 %15, 1
store i32 %16, i32* %2
br label %5
17: ; preds = %5
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str.1 = [4 x i8] c"%5d\00"
@.str.2 = [9 x i8] c"a==&a[0]\00"
define void @see_the_test_result() {
%1 = alloca [10 x i32]
%2 = bitcast [10 x i32]* %1 to i8*
%3 = call i32 ([10 x i32]*, i32, ...) bitcast (i32 (...)* @subcall to i32 ([10 x i32]*, i32, ...)*)([10 x i32]* %1, i32 10)
%4 = call i32 @putchar(i32 10)
%5 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 0
%6 = load i32, i32* %5
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %6)
%8 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 1
%9 = load i32, i32* %8
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %9)
%11 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 2
%12 = load i32, i32* %11
%13 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %12)
%14 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 3
%15 = load i32, i32* %14
%16 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %15)
%17 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 4
%18 = load i32, i32* %17
%19 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %18)
%20 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 5
%21 = load i32, i32* %20
%22 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %21)
%23 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 6
%24 = load i32, i32* %23
%25 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %24)
%26 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 7
%27 = load i32, i32* %26
%28 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %27)
%29 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 8
%30 = load i32, i32* %29
%31 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %30)
%32 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 9
%33 = load i32, i32* %32
%34 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %33)
%35 = call i32 @putchar(i32 10)
%36 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0))
ret void
}