[LLVMbugs] [Bug 2338] New: instcombine isn't run after DSE

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat May 17 12:04:36 PDT 2008


           Summary: instcombine isn't run after DSE
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-gcc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org
                CC: llvmbugs at cs.uiuc.edu

Surprisingly (to me at least) instcombine isn't run anytime late in the
optimizer pipeline.  This prevents llvm from eliminating the malloc/free in
this example, which requires dse to remove the store first.

void *malloc(__SIZE_TYPE__);
void free(void*);
int f(void)
  char *i = malloc(1);
  *i = 1;
  free (i);

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