combine: Do not throw away unneeded arms of parallels (PR83156)

[gcc.git] / gcc / combine.c

diff --git a/gcc/combine.c b/gcc/combine.c
index 0ce07511a3e351fd01d8f80ad6fe55298defc227..cfe24f42633840957f46c57d063b7723f63b721e 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -3016,7 +3016,8 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0,
       && can_split_parallel_of_n_reg_sets (i2, 2)
       && !reg_used_between_p (SET_DEST (XVECEXP (PATTERN (i2), 0, 0)), i2, i3)
       && !reg_used_between_p (SET_DEST (XVECEXP (PATTERN (i2), 0, 1)), i2, i3)
-      && !find_reg_note (i2, REG_UNUSED, 0))
+      && !reg_set_between_p  (SET_DEST (XVECEXP (PATTERN (i2), 0, 0)), i2, i3)
+      && !reg_set_between_p  (SET_DEST (XVECEXP (PATTERN (i2), 0, 1)), i2, i3))
     {
       /* If there is no I1, there is no I0 either.  */
       i0 = i1;