#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 */
scalar_t__ toupper(char const);
int case_ignore_strcmp(const char *s1, const char *s2) {
  for (; toupper(*s1) == toupper(*s2); ++s1, ++s2) {
    if (*s1 == 0)
      return 0;
  }
  return (toupper(*s1) < toupper(*s2)) ? -1 : +1;
}


x86 assembly (clang, -O0):
<case_ignore_strcmp>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rax
movsbl (%rax),%edi
call   1030 <toupper@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rax
movsbl (%rax),%edi
call   1030 <toupper@plt>
mov    %rax,%rcx
mov    -0x20(%rbp),%rax
cmp    %rcx,%rax
jne    118a <case_ignore_strcmp+0x7a>
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x0,%eax
jne    1168 <case_ignore_strcmp+0x58>
movl   $0x0,-0x4(%rbp)
jmp    11c0 <case_ignore_strcmp+0xb0>
jmp    116d <case_ignore_strcmp+0x5d>
mov    -0x10(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x10(%rbp)
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    1120 <case_ignore_strcmp+0x10>
mov    -0x10(%rbp),%rax
movsbl (%rax),%edi
call   1030 <toupper@plt>
mov    %rax,-0x28(%rbp)
mov    -0x18(%rbp),%rax
movsbl (%rax),%edi
call   1030 <toupper@plt>
mov    -0x28(%rbp),%rdx
mov    %rax,%rsi
mov    $0x1,%eax
mov    $0xffffffff,%ecx
cmp    %rsi,%rdx
cmovl  %ecx,%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<case_ignore_strcmp>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%rbx
movsbl (%rdi),%edi
call   1030 <toupper@plt>
mov    %rax,%r15
movsbl (%r14),%edi
call   1030 <toupper@plt>
cmp    %rax,%r15
jne    116d <case_ignore_strcmp+0x5d>
nopw   0x0(%rax,%rax,1)
cmpb   $0x0,(%rbx)
je     1195 <case_ignore_strcmp+0x85>
lea    0x1(%r14),%r12
movsbl 0x1(%rbx),%edi
add    $0x1,%rbx
call   1030 <toupper@plt>
mov    %rax,%r15
movsbl 0x1(%r14),%edi
call   1030 <toupper@plt>
mov    %r12,%r14
cmp    %rax,%r15
je     1140 <case_ignore_strcmp+0x30>
jmp    1170 <case_ignore_strcmp+0x60>
mov    %r14,%r12
movsbl (%rbx),%edi
call   1030 <toupper@plt>
mov    %rax,%rbx
movsbl (%r12),%edi
call   1030 <toupper@plt>
xor    %ecx,%ecx
cmp    %rax,%rbx
setge  %cl
lea    (%rcx,%rcx,1),%eax
add    $0xffffffff,%eax
jmp    1197 <case_ignore_strcmp+0x87>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define i32 @case_ignore_strcmp(i8* %0, i8* %1) {
%3 = alloca i32
%4 = alloca i8*
%5 = alloca i8*
store i8* %0, i8** %4
store i8* %1, i8** %5
br label %6
6: ; preds = %21, %2
%7 = load i8*, i8** %4
%8 = load i8, i8* %7
%9 = call i64 @toupper(i8 signext %8)
%10 = load i8*, i8** %5
%11 = load i8, i8* %10
%12 = call i64 @toupper(i8 signext %11)
%13 = icmp eq i64 %9, %12
br i1 %13, label %14, label %26
14: ; preds = %6
%15 = load i8*, i8** %4
%16 = load i8, i8* %15
%17 = sext i8 %16 to i32
%18 = icmp eq i32 %17, 0
br i1 %18, label %19, label %20
19: ; preds = %14
store i32 0, i32* %3
br label %36
20: ; preds = %14
br label %21
21: ; preds = %20
%22 = load i8*, i8** %4
%23 = getelementptr inbounds i8, i8* %22, i32 1
store i8* %23, i8** %4
%24 = load i8*, i8** %5
%25 = getelementptr inbounds i8, i8* %24, i32 1
store i8* %25, i8** %5
br label %6
26: ; preds = %6
%27 = load i8*, i8** %4
%28 = load i8, i8* %27
%29 = call i64 @toupper(i8 signext %28)
%30 = load i8*, i8** %5
%31 = load i8, i8* %30
%32 = call i64 @toupper(i8 signext %31)
%33 = icmp slt i64 %29, %32
%34 = zext i1 %33 to i64
%35 = select i1 %33, i32 -1, i32 1
store i32 %35, i32* %3
br label %36
36: ; preds = %26, %19
%37 = load i32, i32* %3
ret i32 %37
}

LLVM IR (-O2):
define i32 @case_ignore_strcmp(i8* nocapture %0, i8* nocapture %1) {
%3 = load i8, i8* %0
%4 = tail call i64 @toupper(i8 signext %3)
%5 = load i8, i8* %1
%6 = tail call i64 @toupper(i8 signext %5)
%7 = icmp eq i64 %4, %6
br i1 %7, label %8, label %21
8: ; preds = %2, %13
%9 = phi i8* [ %15, %13 ], [ %1, %2 ]
%10 = phi i8* [ %14, %13 ], [ %0, %2 ]
%11 = load i8, i8* %10
%12 = icmp eq i8 %11, 0
br i1 %12, label %30, label %13
13: ; preds = %8
%14 = getelementptr inbounds i8, i8* %10, i64 1
%15 = getelementptr inbounds i8, i8* %9, i64 1
%16 = load i8, i8* %14
%17 = tail call i64 @toupper(i8 signext %16)
%18 = load i8, i8* %15
%19 = tail call i64 @toupper(i8 signext %18)
%20 = icmp eq i64 %17, %19
br i1 %20, label %8, label %21
21: ; preds = %13, %2
%22 = phi i8* [ %0, %2 ], [ %14, %13 ]
%23 = phi i8* [ %1, %2 ], [ %15, %13 ]
%24 = load i8, i8* %22
%25 = tail call i64 @toupper(i8 signext %24)
%26 = load i8, i8* %23
%27 = tail call i64 @toupper(i8 signext %26)
%28 = icmp slt i64 %25, %27
%29 = select i1 %28, i32 -1, i32 1
br label %30
30: ; preds = %8, %21
%31 = phi i32 [ %29, %21 ], [ 0, %8 ]
ret i32 %31
}