[Bug debug/43593] New: Var-tracking unnecessarily flushes all call used registers on calls instead of regs invalidated by call

[jakub at gcc dot gnu dot org]

Flushing e.g. sp on each call is completely unnecessary:
   for (r = 0; r < FIRST_PSEUDO_REGISTER; r++)
-    if (TEST_HARD_REG_BIT (call_used_reg_set, r))
+    if (TEST_HARD_REG_BIT (regs_invalidated_by_call, r))
       var_regno_delete (set, r);


-- 
           Summary: Var-tracking unnecessarily flushes all call used
                    registers on calls instead of regs invalidated by call
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: jakub at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43593