int main(int argc, const char **argv) {
  signed short res;
  if (__builtin_mul_overflow((signed short)0x0, (signed short)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x0, (signed short)0x7FFF, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x0, (signed short)0x8000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x1, (signed short)0x7FFF, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x1, (signed short)0x8000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x2, (signed short)0x3FFF, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x2, (signed short)0xC000, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x2, (signed short)0x7FFF, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x2, (signed short)0x8000, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x0FFF, (signed short)0x8, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x1000, (signed short)0x8, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x7FFF, (signed short)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x7FFF, (signed short)0x1, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x7FFF, (signed short)0x2, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x7FFF, (signed short)0x7FFF,
                              &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x7FFF, (signed short)0x8000,
                              &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x8000, (signed short)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0x8000, (signed short)0x1, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x8000, (signed short)0x2, &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x8000, (signed short)0x7FFF,
                              &res)) {
    return -1;
  }
  if (!__builtin_mul_overflow((signed short)0x8000, (signed short)0x8000,
                              &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0xFFFF, (signed short)0x0, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0xFFFF, (signed short)0x1, &res)) {
    return -1;
  }
  if (__builtin_mul_overflow((signed short)0xFFFF, (signed short)0xFFFF,
                             &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    %ax,%cx
imul   %cx,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    112f <main+0x2f>
jmp    113b <main+0x3b>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
xor    %eax,%eax
mov    %ax,%cx
mov    $0x7fff,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    115c <main+0x5c>
jmp    1168 <main+0x68>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
xor    %eax,%eax
mov    %ax,%cx
mov    $0x8000,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1189 <main+0x89>
jmp    1195 <main+0x95>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x1,%cx
mov    $0x7fff,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    11b5 <main+0xb5>
jmp    11c1 <main+0xc1>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x1,%cx
mov    $0x8000,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    11e1 <main+0xe1>
jmp    11ed <main+0xed>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x2,%cx
mov    $0x3fff,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    120d <main+0x10d>
jmp    1219 <main+0x119>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x2,%cx
mov    $0xc000,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1239 <main+0x139>
jmp    1245 <main+0x145>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x2,%cx
mov    $0x7fff,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    126c <main+0x16c>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x2,%cx
mov    $0x8000,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1293 <main+0x193>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0xfff,%cx
mov    $0x8,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    12b3 <main+0x1b3>
jmp    12bf <main+0x1bf>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x1000,%cx
mov    $0x8,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    12e6 <main+0x1e6>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x7fff,%cx
xor    %eax,%eax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1304 <main+0x204>
jmp    1310 <main+0x210>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x7fff,%cx
mov    $0x1,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1330 <main+0x230>
jmp    133c <main+0x23c>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x7fff,%cx
mov    $0x2,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1363 <main+0x263>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x7fff,%cx
imul   %cx,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1386 <main+0x286>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x7fff,%cx
mov    $0x8000,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    13ad <main+0x2ad>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x8000,%cx
xor    %eax,%eax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    13cb <main+0x2cb>
jmp    13d7 <main+0x2d7>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x8000,%cx
mov    $0x1,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    13f7 <main+0x2f7>
jmp    1403 <main+0x303>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x8000,%cx
mov    $0x2,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    142a <main+0x32a>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x8000,%cx
mov    $0x7fff,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1451 <main+0x351>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0x8000,%cx
imul   %cx,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1474 <main+0x374>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0xffff,%cx
xor    %eax,%eax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    1492 <main+0x392>
jmp    149e <main+0x39e>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0xffff,%cx
mov    $0x1,%ax
imul   %ax,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    14be <main+0x3be>
jmp    14ca <main+0x3ca>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
mov    $0xffff,%cx
imul   %cx,%cx
seto   %al
mov    %cx,-0x12(%rbp)
test   $0x1,%al
jne    14e6 <main+0x3e6>
jmp    14f2 <main+0x3f2>
movl   $0xffffffff,-0x4(%rbp)
jmp    14f9 <main+0x3f9>
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 i16
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 0, i16 0)
%8 = extractvalue { i16, i1 } %7, 1
%9 = extractvalue { i16, i1 } %7, 0
store i16 %9, i16* %6
br i1 %8, label %10, label %11
10: ; preds = %2
store i32 -1, i32* %3
br label %127
11: ; preds = %2
%12 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 0, i16 32767)
%13 = extractvalue { i16, i1 } %12, 1
%14 = extractvalue { i16, i1 } %12, 0
store i16 %14, i16* %6
br i1 %13, label %15, label %16
15: ; preds = %11
store i32 -1, i32* %3
br label %127
16: ; preds = %11
%17 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 0, i16 -32768)
%18 = extractvalue { i16, i1 } %17, 1
%19 = extractvalue { i16, i1 } %17, 0
store i16 %19, i16* %6
br i1 %18, label %20, label %21
20: ; preds = %16
store i32 -1, i32* %3
br label %127
21: ; preds = %16
%22 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 1, i16 32767)
%23 = extractvalue { i16, i1 } %22, 1
%24 = extractvalue { i16, i1 } %22, 0
store i16 %24, i16* %6
br i1 %23, label %25, label %26
25: ; preds = %21
store i32 -1, i32* %3
br label %127
26: ; preds = %21
%27 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 1, i16 -32768)
%28 = extractvalue { i16, i1 } %27, 1
%29 = extractvalue { i16, i1 } %27, 0
store i16 %29, i16* %6
br i1 %28, label %30, label %31
30: ; preds = %26
store i32 -1, i32* %3
br label %127
31: ; preds = %26
%32 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 2, i16 16383)
%33 = extractvalue { i16, i1 } %32, 1
%34 = extractvalue { i16, i1 } %32, 0
store i16 %34, i16* %6
br i1 %33, label %35, label %36
35: ; preds = %31
store i32 -1, i32* %3
br label %127
36: ; preds = %31
%37 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 2, i16 -16384)
%38 = extractvalue { i16, i1 } %37, 1
%39 = extractvalue { i16, i1 } %37, 0
store i16 %39, i16* %6
br i1 %38, label %40, label %41
40: ; preds = %36
store i32 -1, i32* %3
br label %127
41: ; preds = %36
%42 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 2, i16 32767)
%43 = extractvalue { i16, i1 } %42, 1
%44 = extractvalue { i16, i1 } %42, 0
store i16 %44, i16* %6
br i1 %43, label %46, label %45
45: ; preds = %41
store i32 -1, i32* %3
br label %127
46: ; preds = %41
%47 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 2, i16 -32768)
%48 = extractvalue { i16, i1 } %47, 1
%49 = extractvalue { i16, i1 } %47, 0
store i16 %49, i16* %6
br i1 %48, label %51, label %50
50: ; preds = %46
store i32 -1, i32* %3
br label %127
51: ; preds = %46
%52 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 4095, i16 8)
%53 = extractvalue { i16, i1 } %52, 1
%54 = extractvalue { i16, i1 } %52, 0
store i16 %54, i16* %6
br i1 %53, label %55, label %56
55: ; preds = %51
store i32 -1, i32* %3
br label %127
56: ; preds = %51
%57 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 4096, i16 8)
%58 = extractvalue { i16, i1 } %57, 1
%59 = extractvalue { i16, i1 } %57, 0
store i16 %59, i16* %6
br i1 %58, label %61, label %60
60: ; preds = %56
store i32 -1, i32* %3
br label %127
61: ; preds = %56
%62 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 32767, i16 0)
%63 = extractvalue { i16, i1 } %62, 1
%64 = extractvalue { i16, i1 } %62, 0
store i16 %64, i16* %6
br i1 %63, label %65, label %66
65: ; preds = %61
store i32 -1, i32* %3
br label %127
66: ; preds = %61
%67 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 32767, i16 1)
%68 = extractvalue { i16, i1 } %67, 1
%69 = extractvalue { i16, i1 } %67, 0
store i16 %69, i16* %6
br i1 %68, label %70, label %71
70: ; preds = %66
store i32 -1, i32* %3
br label %127
71: ; preds = %66
%72 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 32767, i16 2)
%73 = extractvalue { i16, i1 } %72, 1
%74 = extractvalue { i16, i1 } %72, 0
store i16 %74, i16* %6
br i1 %73, label %76, label %75
75: ; preds = %71
store i32 -1, i32* %3
br label %127
76: ; preds = %71
%77 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 32767, i16 32767)
%78 = extractvalue { i16, i1 } %77, 1
%79 = extractvalue { i16, i1 } %77, 0
store i16 %79, i16* %6
br i1 %78, label %81, label %80
80: ; preds = %76
store i32 -1, i32* %3
br label %127
81: ; preds = %76
%82 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 32767, i16 -32768)
%83 = extractvalue { i16, i1 } %82, 1
%84 = extractvalue { i16, i1 } %82, 0
store i16 %84, i16* %6
br i1 %83, label %86, label %85
85: ; preds = %81
store i32 -1, i32* %3
br label %127
86: ; preds = %81
%87 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 -32768, i16 0)
%88 = extractvalue { i16, i1 } %87, 1
%89 = extractvalue { i16, i1 } %87, 0
store i16 %89, i16* %6
br i1 %88, label %90, label %91
90: ; preds = %86
store i32 -1, i32* %3
br label %127
91: ; preds = %86
%92 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 -32768, i16 1)
%93 = extractvalue { i16, i1 } %92, 1
%94 = extractvalue { i16, i1 } %92, 0
store i16 %94, i16* %6
br i1 %93, label %95, label %96
95: ; preds = %91
store i32 -1, i32* %3
br label %127
96: ; preds = %91
%97 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 -32768, i16 2)
%98 = extractvalue { i16, i1 } %97, 1
%99 = extractvalue { i16, i1 } %97, 0
store i16 %99, i16* %6
br i1 %98, label %101, label %100
100: ; preds = %96
store i32 -1, i32* %3
br label %127
101: ; preds = %96
%102 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 -32768, i16 32767)
%103 = extractvalue { i16, i1 } %102, 1
%104 = extractvalue { i16, i1 } %102, 0
store i16 %104, i16* %6
br i1 %103, label %106, label %105
105: ; preds = %101
store i32 -1, i32* %3
br label %127
106: ; preds = %101
%107 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 -32768, i16 -32768)
%108 = extractvalue { i16, i1 } %107, 1
%109 = extractvalue { i16, i1 } %107, 0
store i16 %109, i16* %6
br i1 %108, label %111, label %110
110: ; preds = %106
store i32 -1, i32* %3
br label %127
111: ; preds = %106
%112 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 -1, i16 0)
%113 = extractvalue { i16, i1 } %112, 1
%114 = extractvalue { i16, i1 } %112, 0
store i16 %114, i16* %6
br i1 %113, label %115, label %116
115: ; preds = %111
store i32 -1, i32* %3
br label %127
116: ; preds = %111
%117 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 -1, i16 1)
%118 = extractvalue { i16, i1 } %117, 1
%119 = extractvalue { i16, i1 } %117, 0
store i16 %119, i16* %6
br i1 %118, label %120, label %121
120: ; preds = %116
store i32 -1, i32* %3
br label %127
121: ; preds = %116
%122 = call { i16, i1 } @llvm.smul.with.overflow.i16(i16 -1, i16 -1)
%123 = extractvalue { i16, i1 } %122, 1
%124 = extractvalue { i16, i1 } %122, 0
store i16 %124, i16* %6
br i1 %123, label %125, label %126
125: ; preds = %121
store i32 -1, i32* %3
br label %127
126: ; preds = %121
store i32 0, i32* %3
br label %127
127: ; preds = %126, %125, %120, %115, %110, %105, %100, %95, %90, %85, %80, %75, %70, %65, %60, %55, %50, %45, %40, %35, %30, %25, %20, %15, %10
%128 = load i32, i32* %3
ret i32 %128
}

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