If your are looking for code to break a C compiler, you can try my tool Quest https://github.com/lindig/quest. It tries to to generate code that shows that a C compiler handles parameter passing wrong. I usually run it in a loop, like here on Mac OS X 10.9.4 witch gcc:

    :quest $ gcc --version
     Configured with: --prefix=/Library/Developer/CommandLineTools/usr  --with-gxx-include-dir=/usr/include/c++/4.2.1
     Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
     Target: x86_64-apple-darwin13.3.0
     Thread model: posix

    :quest $ while true; do 
     > ./main.native -test gcc -n 1 > foo.c
     > gcc -O2 -o foo foo.c 
     > ./foo || break
     > echo -n .
     > done
     ................................................................
     ................................................................
     .................................................
     Assertion failed: (b32 == b43), function callee_b0f, file foo.c, line 128.
     Abort trap: 6

This means the tool found C code where parameter passing is not compiled properly. It took about 10 seconds to find this. The test case is pretty small:

    :quest $ wc foo.c 
	 140     444    3485 foo.c

The generated code that where the assertion checks that parameters are received correctly looks like this:

    static
    union bt8 *
    callee_b0f(struct bt4 *bp7,
	double *bp8,
	struct bt6 bp9,
	float bp10,
	struct bt7 bp11,
	double bp12,
	short int bp13,
	...)
    {
	va_list ap;
	typedef int bd0;
	typedef struct bt0 bd1;
	typedef int bd2;
	typedef union bt3 bd3;
	bd0 b41;
	bd1 b42;
	bd2 b43;
	bd3 b44;
	
	/* seed: 2040 */
	va_start(ap, bp13);
	QUEST_ASSERT(b34 == bp7);
	QUEST_ASSERT(b35 == bp8);
	QUEST_ASSERT(b36.b24.b18 == bp9.b24.b18);
	QUEST_ASSERT(b36.b24.b19 == bp9.b24.b19);
	QUEST_ASSERT(b36.b24.b20 == bp9.b24.b20);
	QUEST_ASSERT(b36.b24.b21 == bp9.b24.b21);
	QUEST_ASSERT(b36.b24.b22 == bp9.b24.b22);
	QUEST_ASSERT(b36.b24.b23 == bp9.b24.b23);
	QUEST_ASSERT(b36.b25 == bp9.b25);
	QUEST_ASSERT(b36.b26 == bp9.b26);
	QUEST_ASSERT(b37 == bp10);
	QUEST_ASSERT(b38.b27 == bp11.b27);
	QUEST_ASSERT(b39 == bp12);
	QUEST_ASSERT(b40 == bp13);
	b41 = va_arg(ap, bd0);
	b42 = va_arg(ap, bd1);
	b43 = va_arg(ap, bd2);
	b44 = va_arg(ap, bd3);
	QUEST_ASSERT(b30 == b41);
	QUEST_ASSERT(b31.b0 == b42.b0);
	QUEST_ASSERT(b32 == b43);
	QUEST_ASSERT(b33.b10.b1 == b44.b10.b1);
	va_end(ap);
	return b29;
    }