int main() {
  signed char a, b, c;
  signed char d;
  unsigned char ua, ub, uc;
  unsigned char ud;
  a = 0x0A;
  b = 0x14;
  c = a - b;
  c = 0;
  a = 0xEC;
  b = 0xE2;
  c = a - b;
  c = 0;
  a = 0xFE;
  b = 0x02;
  c = a - b;
  c = 0;
  a = 0x0A;
  b = 0xFB;
  c = a - b;
  c = 0;
  a = 0x05;
  b = 0xF6;
  c = a - b;
  c = 0;
  a = 0x0F;
  b = 0xF0;
  c = a - b;
  c = 0;
  a = 0xAA;
  b = 0x55;
  c = a - b;
  c = 0;
  d = 15;
  d -= 1;
  d -= 2;
  d -= 3;
  d -= 4;
  d -= 5;
  d = 0;
  ua = 0x0A;
  ub = 0x14;
  uc = ua - ub;
  uc = 0;
  ua = 0xEC;
  ub = 0xE2;
  uc = ua - ub;
  uc = 0;
  ua = 0xFE;
  ub = 0x02;
  uc = ua - ub;
  uc = 0;
  ua = 0x0A;
  ub = 0xFB;
  uc = ua - ub;
  uc = 0;
  ua = 0x05;
  ub = 0xF6;
  uc = ua - ub;
  uc = 0;
  ua = 0x0F;
  ub = 0xF0;
  uc = ua - ub;
  uc = 0;
  ua = 0xAA;
  ub = 0x55;
  uc = ua - ub;
  uc = 0;
  ud = 15;
  ud -= 1;
  ud -= 2;
  ud -= 3;
  ud -= 4;
  ud -= 5;
  ud = 0;
  d = 0;
  d -= 0xFF;
  d -= 0xFE;
  d -= 0xFD;
  d -= 0xFC;
  d -= 0xFB;
  d = 0;
  ud = 0;
  ud -= 0xFF;
  ud -= 0xFE;
  ud -= 0xFD;
  ud -= 0xFC;
  ud -= 0xFB;
  ud = 0;
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
movl   $0x0,-0x4(%rbp)
movb   $0xa,-0x5(%rbp)
movb   $0x14,-0x6(%rbp)
movsbl -0x5(%rbp),%eax
movsbl -0x6(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0x7(%rbp)
movb   $0x0,-0x7(%rbp)
movb   $0xec,-0x5(%rbp)
movb   $0xe2,-0x6(%rbp)
movsbl -0x5(%rbp),%eax
movsbl -0x6(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0x7(%rbp)
movb   $0x0,-0x7(%rbp)
movb   $0xfe,-0x5(%rbp)
movb   $0x2,-0x6(%rbp)
movsbl -0x5(%rbp),%eax
movsbl -0x6(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0x7(%rbp)
movb   $0x0,-0x7(%rbp)
movb   $0xa,-0x5(%rbp)
movb   $0xfb,-0x6(%rbp)
movsbl -0x5(%rbp),%eax
movsbl -0x6(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0x7(%rbp)
movb   $0x0,-0x7(%rbp)
movb   $0x5,-0x5(%rbp)
movb   $0xf6,-0x6(%rbp)
movsbl -0x5(%rbp),%eax
movsbl -0x6(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0x7(%rbp)
movb   $0x0,-0x7(%rbp)
movb   $0xf,-0x5(%rbp)
movb   $0xf0,-0x6(%rbp)
movsbl -0x5(%rbp),%eax
movsbl -0x6(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0x7(%rbp)
movb   $0x0,-0x7(%rbp)
movb   $0xaa,-0x5(%rbp)
movb   $0x55,-0x6(%rbp)
movsbl -0x5(%rbp),%eax
movsbl -0x6(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0x7(%rbp)
movb   $0x0,-0x7(%rbp)
movb   $0xf,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0x1,%eax
mov    %al,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0x2,%eax
mov    %al,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0x3,%eax
mov    %al,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0x4,%eax
mov    %al,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0x5,%eax
mov    %al,-0x8(%rbp)
movb   $0x0,-0x8(%rbp)
movb   $0xa,-0x9(%rbp)
movb   $0x14,-0xa(%rbp)
movzbl -0x9(%rbp),%eax
movzbl -0xa(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0xb(%rbp)
movb   $0x0,-0xb(%rbp)
movb   $0xec,-0x9(%rbp)
movb   $0xe2,-0xa(%rbp)
movzbl -0x9(%rbp),%eax
movzbl -0xa(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0xb(%rbp)
movb   $0x0,-0xb(%rbp)
movb   $0xfe,-0x9(%rbp)
movb   $0x2,-0xa(%rbp)
movzbl -0x9(%rbp),%eax
movzbl -0xa(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0xb(%rbp)
movb   $0x0,-0xb(%rbp)
movb   $0xa,-0x9(%rbp)
movb   $0xfb,-0xa(%rbp)
movzbl -0x9(%rbp),%eax
movzbl -0xa(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0xb(%rbp)
movb   $0x0,-0xb(%rbp)
movb   $0x5,-0x9(%rbp)
movb   $0xf6,-0xa(%rbp)
movzbl -0x9(%rbp),%eax
movzbl -0xa(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0xb(%rbp)
movb   $0x0,-0xb(%rbp)
movb   $0xf,-0x9(%rbp)
movb   $0xf0,-0xa(%rbp)
movzbl -0x9(%rbp),%eax
movzbl -0xa(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0xb(%rbp)
movb   $0x0,-0xb(%rbp)
movb   $0xaa,-0x9(%rbp)
movb   $0x55,-0xa(%rbp)
movzbl -0x9(%rbp),%eax
movzbl -0xa(%rbp),%ecx
sub    %ecx,%eax
mov    %al,-0xb(%rbp)
movb   $0x0,-0xb(%rbp)
movb   $0xf,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0x1,%eax
mov    %al,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0x2,%eax
mov    %al,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0x3,%eax
mov    %al,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0x4,%eax
mov    %al,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0x5,%eax
mov    %al,-0xc(%rbp)
movb   $0x0,-0xc(%rbp)
movb   $0x0,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0xff,%eax
mov    %al,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0xfe,%eax
mov    %al,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0xfd,%eax
mov    %al,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0xfc,%eax
mov    %al,-0x8(%rbp)
movsbl -0x8(%rbp),%eax
sub    $0xfb,%eax
mov    %al,-0x8(%rbp)
movb   $0x0,-0x8(%rbp)
movb   $0x0,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0xff,%eax
mov    %al,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0xfe,%eax
mov    %al,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0xfd,%eax
mov    %al,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0xfc,%eax
mov    %al,-0xc(%rbp)
movzbl -0xc(%rbp),%eax
sub    $0xfb,%eax
mov    %al,-0xc(%rbp)
movb   $0x0,-0xc(%rbp)
xor    %eax,%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
xor    %eax,%eax
ret

LLVM IR (-O0):
define i32 @main() {
%1 = alloca i32
%2 = alloca i8
%3 = alloca i8
%4 = alloca i8
%5 = alloca i8
%6 = alloca i8
%7 = alloca i8
%8 = alloca i8
%9 = alloca i8
store i32 0, i32* %1
store i8 10, i8* %2
store i8 20, i8* %3
%10 = load i8, i8* %2
%11 = sext i8 %10 to i32
%12 = load i8, i8* %3
%13 = sext i8 %12 to i32
%14 = sub nsw i32 %11, %13
%15 = trunc i32 %14 to i8
store i8 %15, i8* %4
store i8 0, i8* %4
store i8 -20, i8* %2
store i8 -30, i8* %3
%16 = load i8, i8* %2
%17 = sext i8 %16 to i32
%18 = load i8, i8* %3
%19 = sext i8 %18 to i32
%20 = sub nsw i32 %17, %19
%21 = trunc i32 %20 to i8
store i8 %21, i8* %4
store i8 0, i8* %4
store i8 -2, i8* %2
store i8 2, i8* %3
%22 = load i8, i8* %2
%23 = sext i8 %22 to i32
%24 = load i8, i8* %3
%25 = sext i8 %24 to i32
%26 = sub nsw i32 %23, %25
%27 = trunc i32 %26 to i8
store i8 %27, i8* %4
store i8 0, i8* %4
store i8 10, i8* %2
store i8 -5, i8* %3
%28 = load i8, i8* %2
%29 = sext i8 %28 to i32
%30 = load i8, i8* %3
%31 = sext i8 %30 to i32
%32 = sub nsw i32 %29, %31
%33 = trunc i32 %32 to i8
store i8 %33, i8* %4
store i8 0, i8* %4
store i8 5, i8* %2
store i8 -10, i8* %3
%34 = load i8, i8* %2
%35 = sext i8 %34 to i32
%36 = load i8, i8* %3
%37 = sext i8 %36 to i32
%38 = sub nsw i32 %35, %37
%39 = trunc i32 %38 to i8
store i8 %39, i8* %4
store i8 0, i8* %4
store i8 15, i8* %2
store i8 -16, i8* %3
%40 = load i8, i8* %2
%41 = sext i8 %40 to i32
%42 = load i8, i8* %3
%43 = sext i8 %42 to i32
%44 = sub nsw i32 %41, %43
%45 = trunc i32 %44 to i8
store i8 %45, i8* %4
store i8 0, i8* %4
store i8 -86, i8* %2
store i8 85, i8* %3
%46 = load i8, i8* %2
%47 = sext i8 %46 to i32
%48 = load i8, i8* %3
%49 = sext i8 %48 to i32
%50 = sub nsw i32 %47, %49
%51 = trunc i32 %50 to i8
store i8 %51, i8* %4
store i8 0, i8* %4
store i8 15, i8* %5
%52 = load i8, i8* %5
%53 = sext i8 %52 to i32
%54 = sub nsw i32 %53, 1
%55 = trunc i32 %54 to i8
store i8 %55, i8* %5
%56 = load i8, i8* %5
%57 = sext i8 %56 to i32
%58 = sub nsw i32 %57, 2
%59 = trunc i32 %58 to i8
store i8 %59, i8* %5
%60 = load i8, i8* %5
%61 = sext i8 %60 to i32
%62 = sub nsw i32 %61, 3
%63 = trunc i32 %62 to i8
store i8 %63, i8* %5
%64 = load i8, i8* %5
%65 = sext i8 %64 to i32
%66 = sub nsw i32 %65, 4
%67 = trunc i32 %66 to i8
store i8 %67, i8* %5
%68 = load i8, i8* %5
%69 = sext i8 %68 to i32
%70 = sub nsw i32 %69, 5
%71 = trunc i32 %70 to i8
store i8 %71, i8* %5
store i8 0, i8* %5
store i8 10, i8* %6
store i8 20, i8* %7
%72 = load i8, i8* %6
%73 = zext i8 %72 to i32
%74 = load i8, i8* %7
%75 = zext i8 %74 to i32
%76 = sub nsw i32 %73, %75
%77 = trunc i32 %76 to i8
store i8 %77, i8* %8
store i8 0, i8* %8
store i8 -20, i8* %6
store i8 -30, i8* %7
%78 = load i8, i8* %6
%79 = zext i8 %78 to i32
%80 = load i8, i8* %7
%81 = zext i8 %80 to i32
%82 = sub nsw i32 %79, %81
%83 = trunc i32 %82 to i8
store i8 %83, i8* %8
store i8 0, i8* %8
store i8 -2, i8* %6
store i8 2, i8* %7
%84 = load i8, i8* %6
%85 = zext i8 %84 to i32
%86 = load i8, i8* %7
%87 = zext i8 %86 to i32
%88 = sub nsw i32 %85, %87
%89 = trunc i32 %88 to i8
store i8 %89, i8* %8
store i8 0, i8* %8
store i8 10, i8* %6
store i8 -5, i8* %7
%90 = load i8, i8* %6
%91 = zext i8 %90 to i32
%92 = load i8, i8* %7
%93 = zext i8 %92 to i32
%94 = sub nsw i32 %91, %93
%95 = trunc i32 %94 to i8
store i8 %95, i8* %8
store i8 0, i8* %8
store i8 5, i8* %6
store i8 -10, i8* %7
%96 = load i8, i8* %6
%97 = zext i8 %96 to i32
%98 = load i8, i8* %7
%99 = zext i8 %98 to i32
%100 = sub nsw i32 %97, %99
%101 = trunc i32 %100 to i8
store i8 %101, i8* %8
store i8 0, i8* %8
store i8 15, i8* %6
store i8 -16, i8* %7
%102 = load i8, i8* %6
%103 = zext i8 %102 to i32
%104 = load i8, i8* %7
%105 = zext i8 %104 to i32
%106 = sub nsw i32 %103, %105
%107 = trunc i32 %106 to i8
store i8 %107, i8* %8
store i8 0, i8* %8
store i8 -86, i8* %6
store i8 85, i8* %7
%108 = load i8, i8* %6
%109 = zext i8 %108 to i32
%110 = load i8, i8* %7
%111 = zext i8 %110 to i32
%112 = sub nsw i32 %109, %111
%113 = trunc i32 %112 to i8
store i8 %113, i8* %8
store i8 0, i8* %8
store i8 15, i8* %9
%114 = load i8, i8* %9
%115 = zext i8 %114 to i32
%116 = sub nsw i32 %115, 1
%117 = trunc i32 %116 to i8
store i8 %117, i8* %9
%118 = load i8, i8* %9
%119 = zext i8 %118 to i32
%120 = sub nsw i32 %119, 2
%121 = trunc i32 %120 to i8
store i8 %121, i8* %9
%122 = load i8, i8* %9
%123 = zext i8 %122 to i32
%124 = sub nsw i32 %123, 3
%125 = trunc i32 %124 to i8
store i8 %125, i8* %9
%126 = load i8, i8* %9
%127 = zext i8 %126 to i32
%128 = sub nsw i32 %127, 4
%129 = trunc i32 %128 to i8
store i8 %129, i8* %9
%130 = load i8, i8* %9
%131 = zext i8 %130 to i32
%132 = sub nsw i32 %131, 5
%133 = trunc i32 %132 to i8
store i8 %133, i8* %9
store i8 0, i8* %9
store i8 0, i8* %5
%134 = load i8, i8* %5
%135 = sext i8 %134 to i32
%136 = sub nsw i32 %135, 255
%137 = trunc i32 %136 to i8
store i8 %137, i8* %5
%138 = load i8, i8* %5
%139 = sext i8 %138 to i32
%140 = sub nsw i32 %139, 254
%141 = trunc i32 %140 to i8
store i8 %141, i8* %5
%142 = load i8, i8* %5
%143 = sext i8 %142 to i32
%144 = sub nsw i32 %143, 253
%145 = trunc i32 %144 to i8
store i8 %145, i8* %5
%146 = load i8, i8* %5
%147 = sext i8 %146 to i32
%148 = sub nsw i32 %147, 252
%149 = trunc i32 %148 to i8
store i8 %149, i8* %5
%150 = load i8, i8* %5
%151 = sext i8 %150 to i32
%152 = sub nsw i32 %151, 251
%153 = trunc i32 %152 to i8
store i8 %153, i8* %5
store i8 0, i8* %5
store i8 0, i8* %9
%154 = load i8, i8* %9
%155 = zext i8 %154 to i32
%156 = sub nsw i32 %155, 255
%157 = trunc i32 %156 to i8
store i8 %157, i8* %9
%158 = load i8, i8* %9
%159 = zext i8 %158 to i32
%160 = sub nsw i32 %159, 254
%161 = trunc i32 %160 to i8
store i8 %161, i8* %9
%162 = load i8, i8* %9
%163 = zext i8 %162 to i32
%164 = sub nsw i32 %163, 253
%165 = trunc i32 %164 to i8
store i8 %165, i8* %9
%166 = load i8, i8* %9
%167 = zext i8 %166 to i32
%168 = sub nsw i32 %167, 252
%169 = trunc i32 %168 to i8
store i8 %169, i8* %9
%170 = load i8, i8* %9
%171 = zext i8 %170 to i32
%172 = sub nsw i32 %171, 251
%173 = trunc i32 %172 to i8
store i8 %173, i8* %9
store i8 0, i8* %9
ret i32 0
}

LLVM IR (-O2):
define i32 @main() {
ret i32 0
}