#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 ei(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 /*<<< orphan*/ nrerror(char *);
int /*<<< orphan*/ printf(char *, ...);
scalar_t__ strncmp(char *, char *, int);
int main(void) {
  char txt[80];
  int i, nval;
  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 Ei", 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("%5s %12s %11s \n", "x", "actual", "ei(x)");
  for (i = 1; i <= nval; i++) {
    fscanf(fp, "%f %f", &x, &val);
    printf("%6.2f %12.6f %12.6f\n", x, val, ei(x));
  }
  fclose(fp);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x90,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xe57(%rip),%rdi
lea    0xe5b(%rip),%rsi
call   10a0 <fopen@plt>
mov    %rax,-0x78(%rbp)
cmp    $0x0,%rax
jne    11cf <main+0x3f>
lea    0xe43(%rip),%rdi
call   1040 <nrerror@plt>
lea    -0x60(%rbp),%rdi
mov    -0x78(%rbp),%rdx
mov    $0x50,%esi
call   1080 <fgets@plt>
lea    -0x60(%rbp),%rdi
lea    0xe41(%rip),%rsi
mov    $0x17,%edx
call   1030 <strncmp@plt>
cmp    $0x0,%rax
je     1236 <main+0xa6>
lea    -0x60(%rbp),%rdi
mov    -0x78(%rbp),%rdx
mov    $0x50,%esi
call   1080 <fgets@plt>
mov    -0x78(%rbp),%rdi
call   1090 <feof@plt>
cmp    $0x0,%rax
je     1231 <main+0xa1>
lea    0xe19(%rip),%rdi
call   1040 <nrerror@plt>
jmp    11e1 <main+0x51>
mov    -0x78(%rbp),%rdi
lea    0xe22(%rip),%rsi
lea    -0x68(%rbp),%rdx
mov    $0x0,%al
call   1070 <fscanf@plt>
lea    -0x60(%rbp),%rsi
lea    0xe13(%rip),%rdi
mov    $0x0,%al
call   1060 <printf@plt>
lea    0xe0a(%rip),%rdi
lea    0xe13(%rip),%rsi
lea    0xe0e(%rip),%rdx
lea    0xe0e(%rip),%rcx
mov    $0x0,%al
call   1060 <printf@plt>
movl   $0x1,-0x64(%rbp)
mov    -0x64(%rbp),%eax
cmp    -0x68(%rbp),%eax
jg     1303 <main+0x173>
mov    -0x78(%rbp),%rdi
lea    0xdef(%rip),%rsi
lea    -0x70(%rbp),%rdx
lea    -0x6c(%rbp),%rcx
mov    $0x0,%al
call   1070 <fscanf@plt>
movss  -0x70(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movsd  %xmm0,-0x80(%rbp)
movss  -0x6c(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movsd  %xmm0,-0x88(%rbp)
ff
movss  -0x70(%rbp),%xmm0
call   10b0 <ei@plt>
movsd  -0x88(%rbp),%xmm1
ff
movaps %xmm0,%xmm2
movsd  -0x80(%rbp),%xmm0
lea    0xda6(%rip),%rdi
mov    $0x3,%al
call   1060 <printf@plt>
mov    -0x64(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x64(%rbp)
jmp    1288 <main+0xf8>
mov    -0x78(%rbp),%rdi
call   1050 <fclose@plt>
xor    %eax,%eax
add    $0x90,%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   10a0 <fopen@plt>
mov    %rax,%rbx
test   %rax,%rax
jne    11c5 <main+0x35>
lea    0xe4d(%rip),%rdi
call   1040 <nrerror@plt>
lea    0x20(%rsp),%r14
mov    %r14,%rdi
mov    $0x50,%esi
mov    %rbx,%rdx
call   1080 <fgets@plt>
lea    0xe4c(%rip),%rsi
mov    %r14,%rdi
mov    $0x17,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     124c <main+0xbc>
lea    0x20(%rsp),%r14
lea    0xe2e(%rip),%r15
lea    0xe3f(%rip),%r12
jmp    1225 <main+0x95>
nopl   0x0(%rax,%rax,1)
mov    %r14,%rdi
mov    %r15,%rsi
mov    $0x17,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     124c <main+0xbc>
mov    %r14,%rdi
mov    $0x50,%esi
mov    %rbx,%rdx
call   1080 <fgets@plt>
mov    %rbx,%rdi
call   1090 <feof@plt>
test   %rax,%rax
je     1210 <main+0x80>
mov    %r12,%rdi
call   1040 <nrerror@plt>
jmp    1210 <main+0x80>
lea    0xe10(%rip),%rsi
lea    0x4(%rsp),%rdx
mov    %rbx,%rdi
xor    %eax,%eax
call   1070 <fscanf@plt>
lea    0xe01(%rip),%rdi
lea    0x20(%rsp),%rsi
xor    %eax,%eax
call   1060 <printf@plt>
lea    0xdf3(%rip),%rdi
lea    0xdfc(%rip),%rsi
lea    0xdf7(%rip),%rdx
lea    0xdf7(%rip),%rcx
xor    %eax,%eax
call   1060 <printf@plt>
cmpl   $0x0,0x4(%rsp)
jle    131d <main+0x18d>
lea    0xde8(%rip),%r14
lea    0x8(%rsp),%r15
lea    0xc(%rsp),%r12
lea    0xddd(%rip),%r13
xor    %ebp,%ebp
nopl   0x0(%rax)
mov    %rbx,%rdi
mov    %r14,%rsi
mov    %r15,%rdx
mov    %r12,%rcx
xor    %eax,%eax
call   1070 <fscanf@plt>
movss  0x8(%rsp),%xmm0
xorps  %xmm1,%xmm1
cvtss2sd %xmm0,%xmm1
movsd  %xmm1,0x18(%rsp)
movss  0xc(%rsp),%xmm1
cvtss2sd %xmm1,%xmm1
movsd  %xmm1,0x10(%rsp)
call   10b0 <ei@plt>
movaps %xmm0,%xmm2
mov    %r13,%rdi
movsd  0x18(%rsp),%xmm0
movsd  0x10(%rsp),%xmm1
mov    $0x3,%al
call   1060 <printf@plt>
add    $0x1,%ebp
cmp    0x4(%rsp),%ebp
jl     12c0 <main+0x130>
mov    %rbx,%rdi
call   1050 <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 Ei\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 = [16 x i8] c"%5s %12s %11s \0A\00"
@.str.8 = [2 x i8] c"x\00"
@.str.9 = [7 x i8] c"actual\00"
@.str.10 = [6 x i8] c"ei(x)\00"
@.str.11 = [6 x i8] c"%f %f\00"
@.str.12 = [21 x i8] c"%6.2f %12.6f %12.6f\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [80 x i8]
%3 = alloca i32
%4 = alloca i32
%5 = alloca float
%6 = alloca float
%7 = alloca i32*
store i32 0, i32* %1
%8 = 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* %8, i32** %7
%9 = icmp eq i32* %8, null
br i1 %9, label %10, label %12
10: ; preds = %0
%11 = call i32 @nrerror(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str.2, i64 0, i64 0))
br label %12
12: ; preds = %10, %0
%13 = getelementptr inbounds [80 x i8], [80 x i8]* %2, i64 0, i64 0
%14 = load i32*, i32** %7
%15 = call i32 @fgets(i8* %13, i32 80, i32* %14)
br label %16
16: ; preds = %29, %12
%17 = getelementptr inbounds [80 x i8], [80 x i8]* %2, i64 0, i64 0
%18 = call i64 @strncmp(i8* %17, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0), i32 23)
%19 = icmp ne i64 %18, 0
br i1 %19, label %20, label %30
20: ; preds = %16
%21 = getelementptr inbounds [80 x i8], [80 x i8]* %2, i64 0, i64 0
%22 = load i32*, i32** %7
%23 = call i32 @fgets(i8* %21, i32 80, i32* %22)
%24 = load i32*, i32** %7
%25 = call i64 @feof(i32* %24)
%26 = icmp ne i64 %25, 0
br i1 %26, label %27, label %29
27: ; preds = %20
%28 = call i32 @nrerror(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.4, i64 0, i64 0))
br label %29
29: ; preds = %27, %20
br label %16
30: ; preds = %16
%31 = load i32*, i32** %7
%32 = call i32 (i32*, i8*, ...) @fscanf(i32* %31, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i32* %4)
%33 = getelementptr inbounds [80 x i8], [80 x i8]* %2, i64 0, i64 0
%34 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.6, i64 0, i64 0), i8* %33)
%35 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 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 ([7 x i8], [7 x i8]* @.str.9, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.10, i64 0, i64 0))
store i32 1, i32* %3
br label %36
36: ; preds = %50, %30
%37 = load i32, i32* %3
%38 = load i32, i32* %4
%39 = icmp sle i32 %37, %38
br i1 %39, label %40, label %53
40: ; preds = %36
%41 = load i32*, i32** %7
%42 = call i32 (i32*, i8*, ...) @fscanf(i32* %41, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.11, i64 0, i64 0), float* %6, float* %5)
%43 = load float, float* %6
%44 = fpext float %43 to double
%45 = load float, float* %5
%46 = fpext float %45 to double
%47 = load float, float* %6
%48 = call double @ei(float %47)
%49 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.12, i64 0, i64 0), double %44, double %46, double %48)
br label %50
50: ; preds = %40
%51 = load i32, i32* %3
%52 = add nsw i32 %51, 1
store i32 %52, i32* %3
br label %36
53: ; preds = %36
%54 = load i32*, i32** %7
%55 = call i32 @fclose(i32* %54)
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 Ei\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 = [16 x i8] c"%5s %12s %11s \0A\00"
@.str.8 = [2 x i8] c"x\00"
@.str.9 = [7 x i8] c"actual\00"
@.str.10 = [6 x i8] c"ei(x)\00"
@.str.11 = [6 x i8] c"%f %f\00"
@.str.12 = [21 x i8] c"%6.2f %12.6f %12.6f\0A\00"
define i32 @main() {
%1 = alloca [80 x i8]
%2 = alloca i32
%3 = alloca float
%4 = alloca float
%5 = getelementptr inbounds [80 x i8], [80 x i8]* %1, i64 0, i64 0
%6 = bitcast i32* %2 to i8*
%7 = bitcast float* %3 to i8*
%8 = bitcast float* %4 to i8*
%9 = 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))
%10 = icmp eq i32* %9, null
br i1 %10, label %11, label %13
11: ; preds = %0
%12 = tail 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 = call i32 @fgets(i8* %5, i32 80, i32* %9)
%15 = call i64 @strncmp(i8* %5, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0), i32 23)
%16 = icmp eq i64 %15, 0
br i1 %16, label %26, label %17
17: ; preds = %13, %23
%18 = call i32 @fgets(i8* %5, i32 80, i32* %9)
%19 = call i64 @feof(i32* %9)
%20 = icmp eq i64 %19, 0
br i1 %20, label %23, label %21
21: ; preds = %17
%22 = call i32 @nrerror(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.4, i64 0, i64 0))
br label %23
23: ; preds = %21, %17
%24 = call i64 @strncmp(i8* %5, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0), i32 23)
%25 = icmp eq i64 %24, 0
br i1 %25, label %26, label %17
26: ; preds = %23, %13
%27 = call i32 (i32*, i8*, ...) @fscanf(i32* %9, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i32* %2)
%28 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.6, i64 0, i64 0), i8* %5)
%29 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 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 ([7 x i8], [7 x i8]* @.str.9, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.10, i64 0, i64 0))
%30 = load i32, i32* %2
%31 = icmp slt i32 %30, 1
br i1 %31, label %44, label %32
32: ; preds = %26, %32
%33 = phi i32 [ %41, %32 ], [ 1, %26 ]
%34 = call i32 (i32*, i8*, ...) @fscanf(i32* %9, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.11, i64 0, i64 0), float* %4, float* %3)
%35 = load float, float* %4
%36 = fpext float %35 to double
%37 = load float, float* %3
%38 = fpext float %37 to double
%39 = call double @ei(float %35)
%40 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.12, i64 0, i64 0), double %36, double %38, double %39)
%41 = add nuw nsw i32 %33, 1
%42 = load i32, i32* %2
%43 = icmp slt i32 %33, %42
br i1 %43, label %32, label %44
44: ; preds = %32, %26
%45 = call i32 @fclose(i32* %9)
ret i32 0
}