* flow.c (propagate_one_insn): Formatting.

[pf3gnuchains/gcc-fork.git] / gcc / flow.c

diff --git a/gcc/flow.c b/gcc/flow.c
index 36232e9..0aa23c0 100644 (file)
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -1581,7 +1581,7 @@ propagate_one_insn (struct propagate_block_info *pbi, rtx insn)
       pbi->cc0_live = 0;
 
       if (libcall_is_dead)
-       prev = propagate_block_delete_libcall ( insn, note);
+       prev = propagate_block_delete_libcall (insn, note);
       else
        {
 
@@ -2284,7 +2284,7 @@ libcall_dead_p (struct propagate_block_info *pbi, rtx note, rtx insn)
     {
       rtx r = SET_SRC (x);
 
-      if (REG_P (r))
+      if (REG_P (r) || GET_CODE (r) == SUBREG)
        {
          rtx call = XEXP (note, 0);
          rtx call_pat;
@@ -2318,10 +2318,20 @@ libcall_dead_p (struct propagate_block_info *pbi, rtx note, rtx insn)
              call_pat = XVECEXP (call_pat, 0, i);
            }
 
-         return insn_dead_p (pbi, call_pat, 1, REG_NOTES (call));
+         if (! insn_dead_p (pbi, call_pat, 1, REG_NOTES (call)))
+           return 0;
+
+         while ((insn = PREV_INSN (insn)) != call)
+           {
+             if (! INSN_P (insn))
+               continue;
+             if (! insn_dead_p (pbi, PATTERN (insn), 0, REG_NOTES (insn)))
+               return 0;
+           }
+         return 1;
        }
     }
-  return 1;
+  return 0;
 }
 
 /* 1 if register REGNO was alive at a place where `setjmp' was called