[LLVMbugs] [Bug 3123] New: clang miscompiling comma operator

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sun Nov 23 22:24:01 PST 2008


           Summary: clang miscompiling comma operator
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu

Seen using r59934 on Ubuntu Hardy on x86.

Obviously the right answer is 1.

regehr at john-home:~/volatile/tmp67$ clang small.c -I/usr/include --emit-llvm -o 
- | llvm-as | llc | as -o small.o ; gcc small.o -o small
regehr at john-home:~/volatile/tmp67$ ./small
regehr at john-home:~/volatile/tmp67$ cat small.c
#include <stdio.h>
#include <stdint.h>

uint32_t g_60;

int32_t func_111 (void);
int32_t func_111 (void)
  g_60 = 1;
  return 1;

void func_1 (void);
void func_1 (void)
  if (func_111 (), 0) { }

int main (void)
  func_1 ();
  printf ("%d\n", g_60);
  return 0;

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