/* If this block ends in a conditional branch, for each register live
from one side of the branch and not the other, record the register
as conditionally dead. */
- if (GET_CODE (bb->end) == JUMP_INSN
+ if ((flags & (PROP_DEATH_NOTES | PROP_SCAN_DEAD_CODE))
+ && GET_CODE (bb->end) == JUMP_INSN
&& any_condjump_p (bb->end))
{
regset_head diff_head;
}
#endif
+ /* If this block has no successors, any stores to the frame that aren't
+ used later in the block are dead. So make a pass over the block
+ recording any such that are made and show them dead at the end. We do
+ a very conservative and simple job here. */
+ if ((flags & PROP_SCAN_DEAD_CODE)
+ && (bb->succ == NULL
+ || (bb->succ->succ_next == NULL
+ && bb->succ->dest == EXIT_BLOCK_PTR)))
+ {
+ rtx insn;
+ for (insn = bb->end; insn != bb->head; insn = PREV_INSN (insn))
+ if (GET_CODE (insn) == INSN
+ && GET_CODE (PATTERN (insn)) == SET
+ && GET_CODE (SET_DEST (PATTERN (insn))) == MEM)
+ {
+ rtx mem = SET_DEST (PATTERN (insn));
+
+ if (XEXP (mem, 0) == frame_pointer_rtx
+ || (GET_CODE (XEXP (mem, 0)) == PLUS
+ && XEXP (XEXP (mem, 0), 0) == frame_pointer_rtx
+ && GET_CODE (XEXP (XEXP (mem, 0), 1)) == CONST_INT))
+ pbi->mem_set_list = alloc_EXPR_LIST (0, mem, pbi->mem_set_list);
+ }
+ }
+
return pbi;
}
{ REG_BASIC_BLOCK (i) = REG_BLOCK_GLOBAL; });
}
- /* If this block has no successors, any stores to the frame that aren't
- used later in the block are dead. So make a pass over the block
- recording any such that are made and show them dead at the end. We do
- a very conservative and simple job here. */
- if (bb->succ != 0 && bb->succ->succ_next == 0
- && bb->succ->dest == EXIT_BLOCK_PTR)
- for (insn = bb->end; insn != bb->head; insn = PREV_INSN (insn))
- if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SET
- && GET_CODE (SET_DEST (PATTERN (insn))) == MEM)
- {
- rtx mem = SET_DEST (PATTERN (insn));
-
- if ((GET_CODE (XEXP (mem, 0)) == REG
- && REGNO (XEXP (mem, 0)) == FRAME_POINTER_REGNUM)
- || (GET_CODE (XEXP (mem, 0)) == PLUS
- && GET_CODE (XEXP (XEXP (mem, 0), 0)) == REG
- && REGNO (XEXP (XEXP (mem, 0), 0)) == FRAME_POINTER_REGNUM))
- pbi->mem_set_list = alloc_EXPR_LIST (0, mem, pbi->mem_set_list);
- }
-
/* Scan the block an insn at a time from end to beginning. */
for (insn = bb->end; ; insn = prev)