#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 */

/* Variables and functions */
float compute_suffix(char *);
int /*<<< orphan*/ gets(char *);
int /*<<< orphan*/ infix_to_suffix(char *, char *);
int /*<<< orphan*/ printf(char *, ...);
void main() {
  char exp[50], suffix[50];
  float ret;
  printf("input an expression : ");
  gets(exp);
  printf("infix expression : %s\n", exp);
  infix_to_suffix(exp, suffix);
  printf("suffix expression : %s\n", suffix);
  ret = compute_suffix(suffix);
  printf("compute result : %f\n", ret);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x90,%rsp
lea    0xeae(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x40(%rbp),%rdi
call   1050 <gets@plt>
lea    -0x40(%rbp),%rsi
lea    0xeaa(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x40(%rbp),%rdi
lea    -0x80(%rbp),%rsi
call   1060 <infix_to_suffix@plt>
lea    -0x80(%rbp),%rsi
lea    0xea2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x80(%rbp),%rdi
call   1040 <compute_suffix@plt>
movss  %xmm0,-0x84(%rbp)
ff
movss  -0x84(%rbp),%xmm0
ff
cvtss2sd %xmm0,%xmm0
lea    0xe8f(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
add    $0x90,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x78,%rsp
lea    0xeb2(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0x40(%rsp),%rbx
mov    %rbx,%rdi
call   1050 <gets@plt>
lea    0xeae(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
mov    %rsp,%r14
mov    %rbx,%rdi
mov    %r14,%rsi
call   1060 <infix_to_suffix@plt>
lea    0xea6(%rip),%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
mov    %r14,%rdi
call   1040 <compute_suffix@plt>
cvtss2sd %xmm0,%xmm0
lea    0xea1(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
add    $0x78,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [23 x i8] c"input an expression : \00"
@.str.1 = [23 x i8] c"infix expression : %s\0A\00"
@.str.2 = [24 x i8] c"suffix expression : %s\0A\00"
@.str.3 = [21 x i8] c"compute result : %f\0A\00"
define void @main() {
%1 = alloca [50 x i8]
%2 = alloca [50 x i8]
%3 = alloca float
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%6 = call i32 @gets(i8* %5)
%7 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.1, i64 0, i64 0), i8* %7)
%9 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%10 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%11 = call i32 @infix_to_suffix(i8* %9, i8* %10)
%12 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.2, i64 0, i64 0), i8* %12)
%14 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%15 = call float @compute_suffix(i8* %14)
store float %15, float* %3
%16 = load float, float* %3
%17 = fpext float %16 to double
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.3, i64 0, i64 0), double %17)
ret void
}

LLVM IR (-O2):
@.str = [23 x i8] c"input an expression : \00"
@.str.1 = [23 x i8] c"infix expression : %s\0A\00"
@.str.2 = [24 x i8] c"suffix expression : %s\0A\00"
@.str.3 = [21 x i8] c"compute result : %f\0A\00"
define void @main() {
%1 = alloca [50 x i8]
%2 = alloca [50 x i8]
%3 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%4 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @gets(i8* %3)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @.str.1, i64 0, i64 0), i8* %3)
%8 = call i32 @infix_to_suffix(i8* %3, i8* %4)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @.str.2, i64 0, i64 0), i8* %4)
%10 = call float @compute_suffix(i8* %4)
%11 = fpext float %10 to double
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.3, i64 0, i64 0), double %11)
ret void
}