(try_pre_increment_1): Don't try to create a pre-increment expression

if the register dies in the succeeding insn. From-SVN: r7308

(try_pre_increment_1): Don't try to create a pre-increment expression
if the register dies in the succeeding insn. From-SVN: r7308
89861c38 · Richard Kenner · 4ac09687 · 89861c38
Commit 89861c38 authored May 16, 1994 by Richard Kenner
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gcc/flow.c
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--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -2516,6 +2516,9 @@ try_pre_increment_1 (insn)
  rtx y = reg_next_use[regno];
  if (y != 0
      && BLOCK_NUM (y) == BLOCK_NUM (insn)
+      /* Don't do this if the reg dies, or gets set in y; a standard addressing
+	 mode would be better. */
+      && ! dead_or_set_p (y, SET_DEST (x))
      && try_pre_increment (y, SET_DEST (PATTERN (insn)),
 			    amount))
    {