[LRA]: Fix a bug in finding conflicts in rematerialization

In LRA rematerialization wrong mode is used to find register conflicts. It
can result in wrong rematerialization. The patch fixes this.

gcc/ChangeLog:

	* lra-remat.cc (reg_overlap_for_remat_p): Use the right mode for
	regno2.

diff --git a/gcc/lra-remat.cc b/gcc/lra-remat.cc
index c7ae0f7b8c161b120b26eed5f132615efb2866c8..c4da3f75e59855eff9f8e4d78c97b6095608df9b 100644 (file)
--- a/gcc/lra-remat.cc
+++ b/gcc/lra-remat.cc
@@ -697,7 +697,7 @@ reg_overlap_for_remat_p (lra_insn_reg *reg, rtx_insn *insn)
        if (regno2 >= FIRST_PSEUDO_REGISTER)
          nregs2 = 1;
        else
-         nregs2 = hard_regno_nregs (regno2, reg->biggest_mode);
+         nregs2 = hard_regno_nregs (regno2, reg2->biggest_mode);
 
        if ((regno2 + nregs2 - 1 >= regno && regno2 < regno + nregs)
            || (regno + nregs - 1 >= regno2 && regno < regno2 + nregs2))