void print_float_array(array_f) float array_f[];
{
  int index;
  printf("array_f :\n");
  printf("=========\n\n");
  for (index = 0; index < 15; index++) {
    printf("%f  ", array_f[index]);
    if ((index % 8) == 0)
      printf("\n");
  }
  printf("\n\n");
}


x86 assembly (clang, -O0):
<print_float_array>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
lea    0xedd(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeda(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0xc(%rbp)
cmpl   $0xf,-0xc(%rbp)
jge    119d <print_float_array+0x8d>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movss  (%rax,%rcx,4),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xeb6(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
mov    $0x8,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    118a <print_float_array+0x7a>
lea    0xe92(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    118f <print_float_array+0x7f>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    113f <print_float_array+0x2f>
lea    0xe70(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_float_array>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r15
lea    0xec6(%rip),%rdi
call   1040 <puts@plt>
lea    0xec4(%rip),%rdi
call   1040 <puts@plt>
xor    %ebx,%ebx
lea    0xea7(%rip),%r14
jmp    116a <print_float_array+0x3a>
nopl   0x0(%rax,%rax,1)
add    $0x1,%rbx
cmp    $0xf,%rbx
je     118f <print_float_array+0x5f>
movss  (%r15,%rbx,4),%xmm0
cvtss2sd %xmm0,%xmm0
mov    %r14,%rdi
mov    $0x1,%al
call   1050 <printf@plt>
test   $0x7,%bl
jne    1160 <print_float_array+0x30>
mov    $0xa,%edi
call   1030 <putchar@plt>
jmp    1160 <print_float_array+0x30>
lea    0xe82(%rip),%rdi
pop    %rbx
pop    %r14
pop    %r15
jmp    1040 <puts@plt>

LLVM IR (-O0):
@.str = [11 x i8] c"array_f :\0A\00"
@.str.1 = [12 x i8] c"=========\0A\0A\00"
@.str.2 = [5 x i8] c"%f \00"
@.str.3 = [2 x i8] c"\0A\00"
@.str.4 = [3 x i8] c"\0A\0A\00"
define void @print_float_array(float* %0) {
%2 = alloca float*
%3 = alloca i32
store float* %0, float** %2
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0))
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
store i32 0, i32* %3
br label %6
6: ; preds = %23, %1
%7 = load i32, i32* %3
%8 = icmp slt i32 %7, 15
br i1 %8, label %9, label %26
9: ; preds = %6
%10 = load float*, float** %2
%11 = load i32, i32* %3
%12 = sext i32 %11 to i64
%13 = getelementptr inbounds float, float* %10, i64 %12
%14 = load float, float* %13
%15 = fpext float %14 to double
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), double %15)
%17 = load i32, i32* %3
%18 = srem i32 %17, 8
%19 = icmp eq i32 %18, 0
br i1 %19, label %20, label %22
20: ; preds = %9
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
br label %22
22: ; preds = %20, %9
br label %23
23: ; preds = %22
%24 = load i32, i32* %3
%25 = add nsw i32 %24, 1
store i32 %25, i32* %3
br label %6
26: ; preds = %6
%27 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.4, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str.2 = [5 x i8] c"%f \00"
@str = [10 x i8] c"array_f :\00"
@str.5 = [11 x i8] c"=========\0A\00"
@str.6 = [2 x i8] c"\0A\00"
define void @print_float_array(float* nocapture %0) {
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @str, i64 0, i64 0))
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @str.5, i64 0, i64 0))
br label %4
4: ; preds = %1, %14
%5 = phi i64 [ 0, %1 ], [ %15, %14 ]
%6 = getelementptr inbounds float, float* %0, i64 %5
%7 = load float, float* %6
%8 = fpext float %7 to double
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), double %8)
%10 = and i64 %5, 7
%11 = icmp eq i64 %10, 0
br i1 %11, label %12, label %14
12: ; preds = %4
%13 = tail call i32 @putchar(i32 10)
br label %14
14: ; preds = %4, %12
%15 = add nuw nsw i64 %5, 1
%16 = icmp eq i64 %15, 15
br i1 %16, label %17, label %4
17: ; preds = %14
%18 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([2 x i8], [2 x i8]* @str.6, i64 0, i64 0))
ret void
}