[Bug rtl-optimization/90976] New: A suspicious code in lra.c since r177852

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90976

            Bug ID: 90976
           Summary: A suspicious code in lra.c since r177852
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---

clang-static-analyzer reports following suspicious code:

$ cat -n gcc/lra.c | less

  1031            if (nop > 0)
  1032              {
  1033                const char *p =  recog_data.constraints[0];
  1034  
  1035                for (p =  constraints[0]; *p; p++)
  1036                  nalt += *p == ',';
  1037              }

As seen result of 'p =  recog_data.constraints[0];' is never used.