#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 */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, double);
int write_to_csv(char *fname, double *data, int n_data) {
  FILE *outfile;
  outfile = fopen(fname, "w");
  int i;
  if (outfile != NULL) {
    for (i = 0; i < n_data; i++) {
      fprintf(outfile, "%f,", data[i]);
    }
  }
  fclose(outfile);
  return 0;
}


x86 assembly (clang, -O0):
<write_to_csv>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %edx,-0x14(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xeb2(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
je     11a5 <write_to_csv+0x75>
movl   $0x0,-0x24(%rbp)
mov    -0x24(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    11a0 <write_to_csv+0x70>
mov    -0x20(%rbp),%rdi
mov    -0x10(%rbp),%rax
movslq -0x24(%rbp),%rcx
movsd  (%rax,%rcx,8),%xmm0
lea    0xe75(%rip),%rsi
call   1040 <fprintf@plt>
mov    -0x24(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x24(%rbp)
jmp    1169 <write_to_csv+0x39>
jmp    11a5 <write_to_csv+0x75>
mov    -0x20(%rbp),%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<write_to_csv>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    %edx,%ebp
mov    %rsi,%r14
lea    0xebc(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,%r12
test   %rax,%rax
je     117a <write_to_csv+0x4a>
test   %ebp,%ebp
jle    117a <write_to_csv+0x4a>
mov    %ebp,%ebp
xor    %ebx,%ebx
lea    0xea2(%rip),%r15
movsd  (%r14,%rbx,8),%xmm0
mov    %r12,%rdi
mov    %r15,%rsi
call   1040 <fprintf@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1160 <write_to_csv+0x30>
mov    %r12,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [2 x i8] c"w\00"
@.str.1 = [4 x i8] c"%f,\00"
define i32 @write_to_csv(i8* %0, double* %1, i32 %2) {
%4 = alloca i8*
%5 = alloca double*
%6 = alloca i32
%7 = alloca i32*
%8 = alloca i32
store i8* %0, i8** %4
store double* %1, double** %5
store i32 %2, i32* %6
%9 = load i8*, i8** %4
%10 = call i32* @fopen(i8* %9, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %10, i32** %7
%11 = load i32*, i32** %7
%12 = icmp ne i32* %11, null
br i1 %12, label %13, label %30
13: ; preds = %3
store i32 0, i32* %8
br label %14
14: ; preds = %26, %13
%15 = load i32, i32* %8
%16 = load i32, i32* %6
%17 = icmp slt i32 %15, %16
br i1 %17, label %18, label %29
18: ; preds = %14
%19 = load i32*, i32** %7
%20 = load double*, double** %5
%21 = load i32, i32* %8
%22 = sext i32 %21 to i64
%23 = getelementptr inbounds double, double* %20, i64 %22
%24 = load double, double* %23
%25 = call i32 @fprintf(i32* %19, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), double %24)
br label %26
26: ; preds = %18
%27 = load i32, i32* %8
%28 = add nsw i32 %27, 1
store i32 %28, i32* %8
br label %14
29: ; preds = %14
br label %30
30: ; preds = %29, %3
%31 = load i32*, i32** %7
%32 = call i32 @fclose(i32* %31)
ret i32 0
}

LLVM IR (-O2):
@.str = [2 x i8] c"w\00"
@.str.1 = [4 x i8] c"%f,\00"
define i32 @write_to_csv(i8* nocapture %0, double* nocapture %1, i32 %2) {
%4 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%5 = icmp ne i32* %4, null
%6 = icmp sgt i32 %2, 0
%7 = and i1 %5, %6
br i1 %7, label %8, label %17
8: ; preds = %3
%9 = zext i32 %2 to i64
br label %10
10: ; preds = %8, %10
%11 = phi i64 [ 0, %8 ], [ %15, %10 ]
%12 = getelementptr inbounds double, double* %1, i64 %11
%13 = load double, double* %12
%14 = tail call i32 @fprintf(i32* %4, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), double %13)
%15 = add nuw nsw i64 %11, 1
%16 = icmp eq i64 %15, %9
br i1 %16, label %17, label %10
17: ; preds = %10, %3
%18 = tail call i32 @fclose(i32* %4)
ret i32 0
}