[LLVMbugs] [Bug 671] NEW: switch statement miscompilation

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Mon Nov 28 16:50:33 PST 2005


           Summary: switch statement miscompilation
           Product: libraries
           Version: 1.6
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Miscellaneous Instrumentation passes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: markus at oberhumer.com

llvm 1.6 miscompiles the switch statement below. Looking at the C output it does
incorrectly cast v to unsigned.


#include <stdio.h>

int foo(long long v) {
    switch (v) {
    case 0:
        return 1;
    case -1:
        return 2;
    return 0;

int main() {
    int r = foo(4294967295LL);
    printf("foo = %d\n", r);
    return r;

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