#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 int64_t;

/* Variables and functions */
int /*<<< orphan*/ isspace(char const);
int64_t match_trailing_whitespace(const char *str) {
  const char *itr = str;
  while (*itr) {
    if (!isspace(*itr))
      return 0;
    itr++;
  }
  return (itr - str);
}


x86 assembly (clang, -O0):
<match_trailing_whitespace>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
cmpb   $0x0,(%rax)
je     1163 <match_trailing_whitespace+0x53>
mov    -0x18(%rbp),%rax
movsbl (%rax),%edi
call   1030 <isspace@plt>
cmp    $0x0,%eax
jne    1152 <match_trailing_whitespace+0x42>
movl   $0x0,-0x4(%rbp)
jmp    1171 <match_trailing_whitespace+0x61>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    1124 <match_trailing_whitespace+0x14>
mov    -0x18(%rbp),%rax
mov    -0x10(%rbp),%rcx
sub    %rcx,%rax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<match_trailing_whitespace>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
mov    (%rdi),%al
mov    %rdi,%rbx
test   %al,%al
je     1148 <match_trailing_whitespace+0x38>
mov    %r14,%rbx
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
movsbl %al,%edi
call   1030 <isspace@plt>
test   %eax,%eax
je     114d <match_trailing_whitespace+0x3d>
movzbl 0x1(%rbx),%eax
add    $0x1,%rbx
test   %al,%al
jne    1130 <match_trailing_whitespace+0x20>
sub    %r14d,%ebx
jmp    114f <match_trailing_whitespace+0x3f>
xor    %ebx,%ebx
mov    %ebx,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define i32 @match_trailing_whitespace(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i8*
store i8* %0, i8** %3
%5 = load i8*, i8** %3
store i8* %5, i8** %4
br label %6
6: ; preds = %16, %1
%7 = load i8*, i8** %4
%8 = load i8, i8* %7
%9 = icmp ne i8 %8, 0
br i1 %9, label %10, label %19
10: ; preds = %6
%11 = load i8*, i8** %4
%12 = load i8, i8* %11
%13 = call i32 @isspace(i8 signext %12)
%14 = icmp ne i32 %13, 0
br i1 %14, label %16, label %15
15: ; preds = %10
store i32 0, i32* %2
br label %26
16: ; preds = %10
%17 = load i8*, i8** %4
%18 = getelementptr inbounds i8, i8* %17, i32 1
store i8* %18, i8** %4
br label %6
19: ; preds = %6
%20 = load i8*, i8** %4
%21 = load i8*, i8** %3
%22 = ptrtoint i8* %20 to i64
%23 = ptrtoint i8* %21 to i64
%24 = sub i64 %22, %23
%25 = trunc i64 %24 to i32
store i32 %25, i32* %2
br label %26
26: ; preds = %19, %15
%27 = load i32, i32* %2
ret i32 %27
}

LLVM IR (-O2):
define i32 @match_trailing_whitespace(i8* %0) {
%2 = load i8, i8* %0
%3 = icmp eq i8 %2, 0
br i1 %3, label %13, label %4
4: ; preds = %1, %9
%5 = phi i8 [ %11, %9 ], [ %2, %1 ]
%6 = phi i8* [ %10, %9 ], [ %0, %1 ]
%7 = tail call i32 @isspace(i8 signext %5)
%8 = icmp eq i32 %7, 0
br i1 %8, label %19, label %9
9: ; preds = %4
%10 = getelementptr inbounds i8, i8* %6, i64 1
%11 = load i8, i8* %10
%12 = icmp eq i8 %11, 0
br i1 %12, label %13, label %4
13: ; preds = %9, %1
%14 = phi i8* [ %0, %1 ], [ %10, %9 ]
%15 = ptrtoint i8* %14 to i64
%16 = ptrtoint i8* %0 to i64
%17 = sub i64 %15, %16
%18 = trunc i64 %17 to i32
br label %19
19: ; preds = %4, %13
%20 = phi i32 [ %18, %13 ], [ 0, %4 ]
ret i32 %20
}