#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 */
double expint(int, float);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
scalar_t__ feof(int /*<<< orphan*/ *);
int /*<<< orphan*/ fgets(char *, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fscanf(int /*<<< orphan*/ *, char *, int *, ...);
int /*<<< orphan*/ nrerror(char *);
int /*<<< orphan*/ printf(char *, ...);
scalar_t__ strncmp(char *, char *, int);
int main(void) {
  char txt[80];
  int i, nval, n;
  float val, x;
  FILE *fp;
  if ((fp = fopen("fncval.dat", "r")) == NULL)
    nrerror("Data file fncval.dat not found\n");
  fgets(txt, 80, fp);
  while (strncmp(txt, "Exponential Integral En", 23)) {
    fgets(txt, 80, fp);
    if (feof(fp))
      nrerror("Data not found in fncval.dat\n");
  }
  fscanf(fp, "%d %*s", &nval);
  printf("\n%s\n", txt);
  printf("%4s %7s %15s %21s \n", "n", "x", "actual", "expint(n,x)");
  for (i = 1; i <= nval; i++) {
    fscanf(fp, "%d %f %f", &n, &x, &val);
    printf("%4d %8.2f %18.6e %18.6e\n", n, x, val, expint(n, x));
  }
  fclose(fp);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0xa0,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xe57(%rip),%rdi
lea    0xe5b(%rip),%rsi
call   10b0 <fopen@plt>
mov    %rax,-0x80(%rbp)
cmp    $0x0,%rax
jne    11cf <main+0x3f>
lea    0xe43(%rip),%rdi
call   1050 <nrerror@plt>
lea    -0x60(%rbp),%rdi
mov    -0x80(%rbp),%rdx
mov    $0x50,%esi
call   1090 <fgets@plt>
lea    -0x60(%rbp),%rdi
lea    0xe41(%rip),%rsi
mov    $0x17,%edx
call   1040 <strncmp@plt>
cmp    $0x0,%rax
je     1236 <main+0xa6>
lea    -0x60(%rbp),%rdi
mov    -0x80(%rbp),%rdx
mov    $0x50,%esi
call   1090 <fgets@plt>
mov    -0x80(%rbp),%rdi
call   10a0 <feof@plt>
cmp    $0x0,%rax
je     1231 <main+0xa1>
lea    0xe19(%rip),%rdi
call   1050 <nrerror@plt>
jmp    11e1 <main+0x51>
mov    -0x80(%rbp),%rdi
lea    0xe22(%rip),%rsi
lea    -0x68(%rbp),%rdx
mov    $0x0,%al
call   1080 <fscanf@plt>
lea    -0x60(%rbp),%rsi
lea    0xe13(%rip),%rdi
mov    $0x0,%al
call   1070 <printf@plt>
lea    0xe0a(%rip),%rdi
lea    0xdd7(%rip),%rsi
lea    0xe10(%rip),%rdx
lea    0xe0b(%rip),%rcx
lea    0xe0b(%rip),%r8
mov    $0x0,%al
call   1070 <printf@plt>
movl   $0x1,-0x64(%rbp)
mov    -0x64(%rbp),%eax
cmp    -0x68(%rbp),%eax
jg     1326 <main+0x196>
mov    -0x80(%rbp),%rdi
lea    0xdf2(%rip),%rsi
lea    -0x6c(%rbp),%rdx
lea    -0x74(%rbp),%rcx
lea    -0x70(%rbp),%r8
mov    $0x0,%al
call   1080 <fscanf@plt>
mov    -0x6c(%rbp),%eax
mov    %eax,-0x94(%rbp)
movss  -0x74(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movsd  %xmm0,-0x88(%rbp)
ff
movss  -0x70(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movsd  %xmm0,-0x90(%rbp)
ff
mov    -0x6c(%rbp),%edi
movss  -0x74(%rbp),%xmm0
call   1030 <expint@plt>
mov    -0x94(%rbp),%esi
movsd  -0x90(%rbp),%xmm1
ff
movaps %xmm0,%xmm2
movsd  -0x88(%rbp),%xmm0
ff
lea    0xd90(%rip),%rdi
mov    $0x3,%al
call   1070 <printf@plt>
mov    -0x64(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x64(%rbp)
jmp    128f <main+0xff>
mov    -0x80(%rbp),%rdi
call   1060 <fclose@plt>
xor    %eax,%eax
add    $0xa0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x78,%rsp
lea    0xe5b(%rip),%rdi
lea    0xe5f(%rip),%rsi
call   10b0 <fopen@plt>
mov    %rax,%rbx
test   %rax,%rax
jne    11c5 <main+0x35>
lea    0xe4d(%rip),%rdi
call   1050 <nrerror@plt>
lea    0x20(%rsp),%rbp
mov    %rbp,%rdi
mov    $0x50,%esi
mov    %rbx,%rdx
call   1090 <fgets@plt>
lea    0xe4c(%rip),%rsi
mov    %rbp,%rdi
mov    $0x17,%edx
call   1040 <strncmp@plt>
test   %rax,%rax
je     124c <main+0xbc>
lea    0x20(%rsp),%rbp
lea    0xe2e(%rip),%r14
lea    0xe3f(%rip),%r15
jmp    1225 <main+0x95>
nopl   0x0(%rax,%rax,1)
mov    %rbp,%rdi
mov    %r14,%rsi
mov    $0x17,%edx
call   1040 <strncmp@plt>
test   %rax,%rax
je     124c <main+0xbc>
mov    %rbp,%rdi
mov    $0x50,%esi
mov    %rbx,%rdx
call   1090 <fgets@plt>
mov    %rbx,%rdi
call   10a0 <feof@plt>
test   %rax,%rax
je     1210 <main+0x80>
mov    %r15,%rdi
call   1050 <nrerror@plt>
jmp    1210 <main+0x80>
lea    0xe10(%rip),%rsi
mov    %rsp,%rdx
mov    %rbx,%rdi
xor    %eax,%eax
call   1080 <fscanf@plt>
lea    0xe03(%rip),%rdi
lea    0x20(%rsp),%rsi
xor    %eax,%eax
call   1070 <printf@plt>
lea    0xdf5(%rip),%rdi
lea    0xdc2(%rip),%rsi
lea    0xdfb(%rip),%rdx
lea    0xdf6(%rip),%rcx
lea    0xdf6(%rip),%r8
xor    %eax,%eax
call   1070 <printf@plt>
cmpl   $0x0,(%rsp)
jle    1332 <main+0x1a2>
lea    0x4(%rsp),%r12
lea    0x8(%rsp),%r13
lea    0xde9(%rip),%rbp
xor    %r15d,%r15d
nopl   0x0(%rax,%rax,1)
mov    %rbx,%rdi
lea    0xdce(%rip),%rsi
lea    0xc(%rsp),%rdx
mov    %r12,%rcx
mov    %r13,%r8
xor    %eax,%eax
call   1080 <fscanf@plt>
mov    0xc(%rsp),%r14d
movss  0x4(%rsp),%xmm0
xorps  %xmm1,%xmm1
cvtss2sd %xmm0,%xmm1
movsd  %xmm1,0x18(%rsp)
movss  0x8(%rsp),%xmm1
cvtss2sd %xmm1,%xmm1
movsd  %xmm1,0x10(%rsp)
mov    %r14d,%edi
call   1030 <expint@plt>
movaps %xmm0,%xmm2
mov    %rbp,%rdi
mov    %r14d,%esi
movsd  0x18(%rsp),%xmm0
movsd  0x10(%rsp),%xmm1
mov    $0x3,%al
call   1070 <printf@plt>
add    $0x1,%r15d
cmp    (%rsp),%r15d
jl     12c0 <main+0x130>
mov    %rbx,%rdi
call   1060 <fclose@plt>
xor    %eax,%eax
add    $0x78,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [11 x i8] c"fncval.dat\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [32 x i8] c"Data file fncval.dat not found\0A\00"
@.str.3 = [24 x i8] c"Exponential Integral En\00"
@.str.4 = [30 x i8] c"Data not found in fncval.dat\0A\00"
@.str.5 = [7 x i8] c"%d %*s\00"
@.str.6 = [5 x i8] c"\0A%s\0A\00"
@.str.7 = [20 x i8] c"%4s %7s %15s %21s \0A\00"
@.str.8 = [2 x i8] c"n\00"
@.str.9 = [2 x i8] c"x\00"
@.str.10 = [7 x i8] c"actual\00"
@.str.11 = [12 x i8] c"expint(n,x)\00"
@.str.12 = [9 x i8] c"%d %f %f\00"
@.str.13 = [25 x i8] c"%4d %8.2f %18.6e %18.6e\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [80 x i8]
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca float
%7 = alloca float
%8 = alloca i32*
store i32 0, i32* %1
%9 = call i32* @fopen(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %9, i32** %8
%10 = icmp eq i32* %9, null
br i1 %10, label %11, label %13
11: ; preds = %0
%12 = call i32 @nrerror(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str.2, i64 0, i64 0))
br label %13
13: ; preds = %11, %0
%14 = getelementptr inbounds [80 x i8], [80 x i8]* %2, i64 0, i64 0
%15 = load i32*, i32** %8
%16 = call i32 @fgets(i8* %14, i32 80, i32* %15)
br label %17
17: ; preds = %30, %13
%18 = getelementptr inbounds [80 x i8], [80 x i8]* %2, i64 0, i64 0
%19 = call i64 @strncmp(i8* %18, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0), i32 23)
%20 = icmp ne i64 %19, 0
br i1 %20, label %21, label %31
21: ; preds = %17
%22 = getelementptr inbounds [80 x i8], [80 x i8]* %2, i64 0, i64 0
%23 = load i32*, i32** %8
%24 = call i32 @fgets(i8* %22, i32 80, i32* %23)
%25 = load i32*, i32** %8
%26 = call i64 @feof(i32* %25)
%27 = icmp ne i64 %26, 0
br i1 %27, label %28, label %30
28: ; preds = %21
%29 = call i32 @nrerror(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.4, i64 0, i64 0))
br label %30
30: ; preds = %28, %21
br label %17
31: ; preds = %17
%32 = load i32*, i32** %8
%33 = call i32 (i32*, i8*, i32*, ...) @fscanf(i32* %32, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i32* %4)
%34 = getelementptr inbounds [80 x i8], [80 x i8]* %2, i64 0, i64 0
%35 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.6, i64 0, i64 0), i8* %34)
%36 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.7, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.8, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.9, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.10, i64 0, i64 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.11, i64 0, i64 0))
store i32 1, i32* %3
br label %37
37: ; preds = %53, %31
%38 = load i32, i32* %3
%39 = load i32, i32* %4
%40 = icmp sle i32 %38, %39
br i1 %40, label %41, label %56
41: ; preds = %37
%42 = load i32*, i32** %8
%43 = call i32 (i32*, i8*, i32*, ...) @fscanf(i32* %42, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.12, i64 0, i64 0), i32* %5, float* %7, float* %6)
%44 = load i32, i32* %5
%45 = load float, float* %7
%46 = fpext float %45 to double
%47 = load float, float* %6
%48 = fpext float %47 to double
%49 = load i32, i32* %5
%50 = load float, float* %7
%51 = call double @expint(i32 %49, float %50)
%52 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.13, i64 0, i64 0), i32 %44, double %46, double %48, double %51)
br label %53
53: ; preds = %41
%54 = load i32, i32* %3
%55 = add nsw i32 %54, 1
store i32 %55, i32* %3
br label %37
56: ; preds = %37
%57 = load i32*, i32** %8
%58 = call i32 @fclose(i32* %57)
ret i32 0
}

LLVM IR (-O2):
@.str = [11 x i8] c"fncval.dat\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [32 x i8] c"Data file fncval.dat not found\0A\00"
@.str.3 = [24 x i8] c"Exponential Integral En\00"
@.str.4 = [30 x i8] c"Data not found in fncval.dat\0A\00"
@.str.5 = [7 x i8] c"%d %*s\00"
@.str.6 = [5 x i8] c"\0A%s\0A\00"
@.str.7 = [20 x i8] c"%4s %7s %15s %21s \0A\00"
@.str.8 = [2 x i8] c"n\00"
@.str.9 = [2 x i8] c"x\00"
@.str.10 = [7 x i8] c"actual\00"
@.str.11 = [12 x i8] c"expint(n,x)\00"
@.str.12 = [9 x i8] c"%d %f %f\00"
@.str.13 = [25 x i8] c"%4d %8.2f %18.6e %18.6e\0A\00"
define i32 @main() {
%1 = alloca [80 x i8]
%2 = alloca i32
%3 = alloca i32
%4 = alloca float
%5 = alloca float
%6 = getelementptr inbounds [80 x i8], [80 x i8]* %1, i64 0, i64 0
%7 = bitcast i32* %2 to i8*
%8 = bitcast i32* %3 to i8*
%9 = bitcast float* %4 to i8*
%10 = bitcast float* %5 to i8*
%11 = tail call i32* @fopen(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%12 = icmp eq i32* %11, null
br i1 %12, label %13, label %15
13: ; preds = %0
%14 = tail call i32 @nrerror(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str.2, i64 0, i64 0))
br label %15
15: ; preds = %13, %0
%16 = call i32 @fgets(i8* %6, i32 80, i32* %11)
%17 = call i64 @strncmp(i8* %6, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0), i32 23)
%18 = icmp eq i64 %17, 0
br i1 %18, label %28, label %19
19: ; preds = %15, %25
%20 = call i32 @fgets(i8* %6, i32 80, i32* %11)
%21 = call i64 @feof(i32* %11)
%22 = icmp eq i64 %21, 0
br i1 %22, label %25, label %23
23: ; preds = %19
%24 = call i32 @nrerror(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.4, i64 0, i64 0))
br label %25
25: ; preds = %23, %19
%26 = call i64 @strncmp(i8* %6, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0), i32 23)
%27 = icmp eq i64 %26, 0
br i1 %27, label %28, label %19
28: ; preds = %25, %15
%29 = call i32 (i32*, i8*, i32*, ...) @fscanf(i32* %11, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i32* %2)
%30 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.6, i64 0, i64 0), i8* %6)
%31 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @.str.7, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.8, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.9, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.10, i64 0, i64 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.11, i64 0, i64 0))
%32 = load i32, i32* %2
%33 = icmp slt i32 %32, 1
br i1 %33, label %47, label %34
34: ; preds = %28, %34
%35 = phi i32 [ %44, %34 ], [ 1, %28 ]
%36 = call i32 (i32*, i8*, i32*, ...) @fscanf(i32* %11, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.12, i64 0, i64 0), i32* %3, float* %5, float* %4)
%37 = load i32, i32* %3
%38 = load float, float* %5
%39 = fpext float %38 to double
%40 = load float, float* %4
%41 = fpext float %40 to double
%42 = call double @expint(i32 %37, float %38)
%43 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.13, i64 0, i64 0), i32 %37, double %39, double %41, double %42)
%44 = add nuw nsw i32 %35, 1
%45 = load i32, i32* %2
%46 = icmp slt i32 %35, %45
br i1 %46, label %34, label %47
47: ; preds = %34, %28
%48 = call i32 @fclose(i32* %11)
ret i32 0
}