int main(int argc, const char **argv) {
  unsigned char res;
  if (__builtin_mul_overflow((unsigned char)0x0, (unsigned char)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x0, (unsigned char)0x7F, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x0, (unsigned char)0x80, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x1, (unsigned char)0x7F, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x1, (unsigned char)0x80, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x2, (unsigned char)0x3F, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x2, (unsigned char)0xC0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x2, (unsigned char)0x7F, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x2, (unsigned char)0x80, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x4, (unsigned char)0x7F, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x4, (unsigned char)0x80, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x0F, (unsigned char)0x8, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x10, (unsigned char)0x8, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x10, (unsigned char)0x10, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x7F, (unsigned char)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x7F, (unsigned char)0x1, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x7F, (unsigned char)0x2, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x7F, (unsigned char)0x4, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x7F, (unsigned char)0x7F, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x7F, (unsigned char)0x80, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x80, (unsigned char)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0x80, (unsigned char)0x1, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x80, (unsigned char)0x2, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x80, (unsigned char)0x7F, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0x80, (unsigned char)0x80, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0xFF, (unsigned char)0x0, &res)) {
    return -1;
  }
  if (res != 0x0) {
    return -1;
  }
  if (__builtin_mul_overflow((unsigned char)0xFF, (unsigned char)0x1, &res)) {
    return -1;
  }
  if (res != 0xFF) {
    return -1;
  }
  if (!__builtin_mul_overflow((unsigned char)0xFF, (unsigned char)0xFF, &res)) {
    return -1;
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
xor    %eax,%eax
mov    %al,%cl
mov    %cl,%al
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    112f <main+0x2f>
jmp    113b <main+0x3b>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
xor    %eax,%eax
mov    $0x7f,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1156 <main+0x56>
jmp    1162 <main+0x62>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
xor    %eax,%eax
mov    $0x80,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    117d <main+0x7d>
jmp    1189 <main+0x89>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x1,%al
mov    $0x7f,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    11a4 <main+0xa4>
jmp    11b0 <main+0xb0>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x1,%al
mov    $0x80,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    11cb <main+0xcb>
jmp    11d7 <main+0xd7>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x2,%al
mov    $0x3f,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    11f2 <main+0xf2>
jmp    11fe <main+0xfe>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x2,%al
mov    $0xc0,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1220 <main+0x120>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x2,%al
mov    $0x7f,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    123b <main+0x13b>
jmp    1247 <main+0x147>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x2,%al
mov    $0x80,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1269 <main+0x169>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x4,%al
mov    $0x7f,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    128b <main+0x18b>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x4,%al
mov    $0x80,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    12ad <main+0x1ad>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0xf,%al
mov    $0x8,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    12c8 <main+0x1c8>
jmp    12d4 <main+0x1d4>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x10,%al
mov    $0x8,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    12ef <main+0x1ef>
jmp    12fb <main+0x1fb>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x10,%cl
mov    %cl,%al
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    131d <main+0x21d>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x7f,%al
xor    %ecx,%ecx
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1338 <main+0x238>
jmp    1344 <main+0x244>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x7f,%al
mov    $0x1,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    135f <main+0x25f>
jmp    136b <main+0x26b>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x7f,%al
mov    $0x2,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1386 <main+0x286>
jmp    1392 <main+0x292>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x7f,%al
mov    $0x4,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    13b4 <main+0x2b4>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x7f,%cl
mov    %cl,%al
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    13d6 <main+0x2d6>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x7f,%al
mov    $0x80,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    13f8 <main+0x2f8>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x80,%al
xor    %ecx,%ecx
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1413 <main+0x313>
jmp    141f <main+0x31f>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x80,%al
mov    $0x1,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    143a <main+0x33a>
jmp    1446 <main+0x346>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x80,%al
mov    $0x2,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1468 <main+0x368>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x80,%al
mov    $0x7f,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    148a <main+0x38a>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0x80,%cl
mov    %cl,%al
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    14ac <main+0x3ac>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0xff,%al
xor    %ecx,%ecx
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    14c7 <main+0x3c7>
jmp    14d3 <main+0x3d3>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
movzbl -0x11(%rbp),%eax
cmp    $0x0,%eax
je     14ec <main+0x3ec>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0xff,%al
mov    $0x1,%cl
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1507 <main+0x407>
jmp    1513 <main+0x413>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
movzbl -0x11(%rbp),%eax
cmp    $0xff,%eax
je     152e <main+0x42e>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
mov    $0xff,%cl
mov    %cl,%al
mul    %cl
mov    %al,%cl
seto   %al
mov    %cl,-0x11(%rbp)
test   $0x1,%al
jne    1550 <main+0x450>
movl   $0xffffffff,-0x4(%rbp)
jmp    1557 <main+0x457>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
pop    %rbp
ret

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

LLVM IR (-O0):
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i8
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 0, i8 0)
%8 = extractvalue { i8, i1 } %7, 1
%9 = extractvalue { i8, i1 } %7, 0
store i8 %9, i8* %6
br i1 %8, label %10, label %11
10: ; preds = %2
store i32 -1, i32* %3
br label %157
11: ; preds = %2
%12 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 0, i8 127)
%13 = extractvalue { i8, i1 } %12, 1
%14 = extractvalue { i8, i1 } %12, 0
store i8 %14, i8* %6
br i1 %13, label %15, label %16
15: ; preds = %11
store i32 -1, i32* %3
br label %157
16: ; preds = %11
%17 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 0, i8 -128)
%18 = extractvalue { i8, i1 } %17, 1
%19 = extractvalue { i8, i1 } %17, 0
store i8 %19, i8* %6
br i1 %18, label %20, label %21
20: ; preds = %16
store i32 -1, i32* %3
br label %157
21: ; preds = %16
%22 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 1, i8 127)
%23 = extractvalue { i8, i1 } %22, 1
%24 = extractvalue { i8, i1 } %22, 0
store i8 %24, i8* %6
br i1 %23, label %25, label %26
25: ; preds = %21
store i32 -1, i32* %3
br label %157
26: ; preds = %21
%27 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 1, i8 -128)
%28 = extractvalue { i8, i1 } %27, 1
%29 = extractvalue { i8, i1 } %27, 0
store i8 %29, i8* %6
br i1 %28, label %30, label %31
30: ; preds = %26
store i32 -1, i32* %3
br label %157
31: ; preds = %26
%32 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 2, i8 63)
%33 = extractvalue { i8, i1 } %32, 1
%34 = extractvalue { i8, i1 } %32, 0
store i8 %34, i8* %6
br i1 %33, label %35, label %36
35: ; preds = %31
store i32 -1, i32* %3
br label %157
36: ; preds = %31
%37 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 2, i8 -64)
%38 = extractvalue { i8, i1 } %37, 1
%39 = extractvalue { i8, i1 } %37, 0
store i8 %39, i8* %6
br i1 %38, label %41, label %40
40: ; preds = %36
store i32 -1, i32* %3
br label %157
41: ; preds = %36
%42 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 2, i8 127)
%43 = extractvalue { i8, i1 } %42, 1
%44 = extractvalue { i8, i1 } %42, 0
store i8 %44, i8* %6
br i1 %43, label %45, label %46
45: ; preds = %41
store i32 -1, i32* %3
br label %157
46: ; preds = %41
%47 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 2, i8 -128)
%48 = extractvalue { i8, i1 } %47, 1
%49 = extractvalue { i8, i1 } %47, 0
store i8 %49, i8* %6
br i1 %48, label %51, label %50
50: ; preds = %46
store i32 -1, i32* %3
br label %157
51: ; preds = %46
%52 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 4, i8 127)
%53 = extractvalue { i8, i1 } %52, 1
%54 = extractvalue { i8, i1 } %52, 0
store i8 %54, i8* %6
br i1 %53, label %56, label %55
55: ; preds = %51
store i32 -1, i32* %3
br label %157
56: ; preds = %51
%57 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 4, i8 -128)
%58 = extractvalue { i8, i1 } %57, 1
%59 = extractvalue { i8, i1 } %57, 0
store i8 %59, i8* %6
br i1 %58, label %61, label %60
60: ; preds = %56
store i32 -1, i32* %3
br label %157
61: ; preds = %56
%62 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 15, i8 8)
%63 = extractvalue { i8, i1 } %62, 1
%64 = extractvalue { i8, i1 } %62, 0
store i8 %64, i8* %6
br i1 %63, label %65, label %66
65: ; preds = %61
store i32 -1, i32* %3
br label %157
66: ; preds = %61
%67 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 16, i8 8)
%68 = extractvalue { i8, i1 } %67, 1
%69 = extractvalue { i8, i1 } %67, 0
store i8 %69, i8* %6
br i1 %68, label %70, label %71
70: ; preds = %66
store i32 -1, i32* %3
br label %157
71: ; preds = %66
%72 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 16, i8 16)
%73 = extractvalue { i8, i1 } %72, 1
%74 = extractvalue { i8, i1 } %72, 0
store i8 %74, i8* %6
br i1 %73, label %76, label %75
75: ; preds = %71
store i32 -1, i32* %3
br label %157
76: ; preds = %71
%77 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 127, i8 0)
%78 = extractvalue { i8, i1 } %77, 1
%79 = extractvalue { i8, i1 } %77, 0
store i8 %79, i8* %6
br i1 %78, label %80, label %81
80: ; preds = %76
store i32 -1, i32* %3
br label %157
81: ; preds = %76
%82 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 127, i8 1)
%83 = extractvalue { i8, i1 } %82, 1
%84 = extractvalue { i8, i1 } %82, 0
store i8 %84, i8* %6
br i1 %83, label %85, label %86
85: ; preds = %81
store i32 -1, i32* %3
br label %157
86: ; preds = %81
%87 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 127, i8 2)
%88 = extractvalue { i8, i1 } %87, 1
%89 = extractvalue { i8, i1 } %87, 0
store i8 %89, i8* %6
br i1 %88, label %90, label %91
90: ; preds = %86
store i32 -1, i32* %3
br label %157
91: ; preds = %86
%92 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 127, i8 4)
%93 = extractvalue { i8, i1 } %92, 1
%94 = extractvalue { i8, i1 } %92, 0
store i8 %94, i8* %6
br i1 %93, label %96, label %95
95: ; preds = %91
store i32 -1, i32* %3
br label %157
96: ; preds = %91
%97 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 127, i8 127)
%98 = extractvalue { i8, i1 } %97, 1
%99 = extractvalue { i8, i1 } %97, 0
store i8 %99, i8* %6
br i1 %98, label %101, label %100
100: ; preds = %96
store i32 -1, i32* %3
br label %157
101: ; preds = %96
%102 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 127, i8 -128)
%103 = extractvalue { i8, i1 } %102, 1
%104 = extractvalue { i8, i1 } %102, 0
store i8 %104, i8* %6
br i1 %103, label %106, label %105
105: ; preds = %101
store i32 -1, i32* %3
br label %157
106: ; preds = %101
%107 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 -128, i8 0)
%108 = extractvalue { i8, i1 } %107, 1
%109 = extractvalue { i8, i1 } %107, 0
store i8 %109, i8* %6
br i1 %108, label %110, label %111
110: ; preds = %106
store i32 -1, i32* %3
br label %157
111: ; preds = %106
%112 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 -128, i8 1)
%113 = extractvalue { i8, i1 } %112, 1
%114 = extractvalue { i8, i1 } %112, 0
store i8 %114, i8* %6
br i1 %113, label %115, label %116
115: ; preds = %111
store i32 -1, i32* %3
br label %157
116: ; preds = %111
%117 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 -128, i8 2)
%118 = extractvalue { i8, i1 } %117, 1
%119 = extractvalue { i8, i1 } %117, 0
store i8 %119, i8* %6
br i1 %118, label %121, label %120
120: ; preds = %116
store i32 -1, i32* %3
br label %157
121: ; preds = %116
%122 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 -128, i8 127)
%123 = extractvalue { i8, i1 } %122, 1
%124 = extractvalue { i8, i1 } %122, 0
store i8 %124, i8* %6
br i1 %123, label %126, label %125
125: ; preds = %121
store i32 -1, i32* %3
br label %157
126: ; preds = %121
%127 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 -128, i8 -128)
%128 = extractvalue { i8, i1 } %127, 1
%129 = extractvalue { i8, i1 } %127, 0
store i8 %129, i8* %6
br i1 %128, label %131, label %130
130: ; preds = %126
store i32 -1, i32* %3
br label %157
131: ; preds = %126
%132 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 -1, i8 0)
%133 = extractvalue { i8, i1 } %132, 1
%134 = extractvalue { i8, i1 } %132, 0
store i8 %134, i8* %6
br i1 %133, label %135, label %136
135: ; preds = %131
store i32 -1, i32* %3
br label %157
136: ; preds = %131
%137 = load i8, i8* %6
%138 = zext i8 %137 to i32
%139 = icmp ne i32 %138, 0
br i1 %139, label %140, label %141
140: ; preds = %136
store i32 -1, i32* %3
br label %157
141: ; preds = %136
%142 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 -1, i8 1)
%143 = extractvalue { i8, i1 } %142, 1
%144 = extractvalue { i8, i1 } %142, 0
store i8 %144, i8* %6
br i1 %143, label %145, label %146
145: ; preds = %141
store i32 -1, i32* %3
br label %157
146: ; preds = %141
%147 = load i8, i8* %6
%148 = zext i8 %147 to i32
%149 = icmp ne i32 %148, 255
br i1 %149, label %150, label %151
150: ; preds = %146
store i32 -1, i32* %3
br label %157
151: ; preds = %146
%152 = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 -1, i8 -1)
%153 = extractvalue { i8, i1 } %152, 1
%154 = extractvalue { i8, i1 } %152, 0
store i8 %154, i8* %6
br i1 %153, label %156, label %155
155: ; preds = %151
store i32 -1, i32* %3
br label %157
156: ; preds = %151
store i32 0, i32* %3
br label %157
157: ; preds = %156, %155, %150, %145, %140, %135, %130, %125, %120, %115, %110, %105, %100, %95, %90, %85, %80, %75, %70, %65, %60, %55, %50, %45, %40, %35, %30, %25, %20, %15, %10
%158 = load i32, i32* %3
ret i32 %158
}

LLVM IR (-O2):
define i32 @main(i32 %0, i8** nocapture readnone %1) {
ret i32 0
}