[LLVMbugs] [Bug 582] NEW: Dereferencing end() in IndVarSimplify::RewriteLoopExitValues()

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=582

           Summary: Dereferencing end() in
                    IndVarSimplify::RewriteLoopExitValues()
           Product: tools
           Version: 1.5
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gccas
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: bryan.turner at pobox.com


I've tried reducing this test case as far as possible, but it appears to require
all of the lines below.

LLVM 1.5 release

gccas: /home/brturn/llvm/llvm/include/llvm/ADT/ilist:120: typename
bidirectional_iterator<NodeTy, ptrdiff_t>::reference
llvm::ilist_iterator<NodeTy>::operator*() const [with NodeTy =
llvm::Instruction]: Assertion `Traits::getNext(NodePtr) != 0 && "Dereferencing
end()!"' failed.

/*
// --- RANDOMLY GENERATED PROGRAM ---
// Program Generator by Bryan Turner (bryan.turner at pobox.com)
*/

#include <stdio.h>
unsigned long context = 0;
unsigned long DEPTH = 0;
void DumbHash( unsigned long value, unsigned int len )
{
	context += value;
	context ^= 0xA50F5AF0;
	printf( "%d\n", context );
}

/* --- GLOBAL VARIABLES --- */
char g_45534591 = 0x4B;


/* --- FORWARD DECLARATIONS --- */
int func_47880058( char l_30575406, char l_86920434 );


/* --- FUNCTIONS --- */
/* ------------------------------------------ */
int func_47880058( char l_30575406, char l_86920434 )
{
	char l_09369994 = 0x8F;
	if ( DEPTH < 5 ) { DEPTH++; func_47880058( g_45534591, l_30575406 ) ; DEPTH--; }
	return l_09369994;
}

/* --- MAIN --- */
/* ------------------------------------------ */
int main(  )
{
	unsigned char l_59025022 = 0xE3;
	char l_14237116 = 0xD2;
	l_59025022 = l_59025022;
	for ( int i=0; i<100; i++ )
	{
		unsigned short l_61607339 = 0x3A37;

		for ( int i=0; i<100; i++ )
		{
			char l_06790138 = 0xBD;
			l_59025022 = l_14237116;
			func_47880058( l_59025022, l_06790138 ) ;
			DumbHash( l_06790138, 1 );
		}

		if ( ( 0x3828ECC6 & 0x3111 )  )
		{
			short l_96478320 = 0xC140;
			unsigned short l_40278093 = 0x9CAB;
			if ( l_14237116 )
			{
				l_14237116 = l_61607339;
				DumbHash( g_45534591, 1 );
			}
		}

		DumbHash( l_59025022, 1 );
	}
	DumbHash( l_59025022, 1 );
}



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