[LLVMbugs] [Bug 15522] New: Loop Optimizer Problems

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Mar 15 00:55:43 PDT 2013


            Bug ID: 15522
           Summary: Loop Optimizer Problems
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: 8181919 at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

#include <stdio.h>
#include <stdlib.h>

int main()
    long buf[2];
    long *pvalue = &buf[0];
    long *pj = &buf[1];
    long *pi = &buf[2];
    for(*pj=0; *pj<1000000; (*pj)++)
        *pvalue = 0;
        for(*pi=0; *pi<1000; (*pi)++)
            *pvalue += (*pi)+1;

    printf("%ld\n", *pvalue);


when I compile it with:clang main.c  -O3 
the result is 0

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