From: Richard Kenner <kenner@gcc.gnu.org>
Date: Fri, 31 Jul 1992 12:15:14 +0000 (-0400)
Subject: (convert_move): Put FROM into a register if it is a SUBREG.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3dc4195c6a0777d896bdd5c11691d80c54064bbe;p=gcc.git

(convert_move): Put FROM into a register if it is a SUBREG.

From-SVN: r1732
---

diff --git a/gcc/expr.c b/gcc/expr.c
index 1e4191f9bb0..8bb7e41d740 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -705,6 +705,12 @@ convert_move (to, from, unsignedp)
       if ((code = can_extend_p (to_mode, from_mode, unsignedp))
 	  != CODE_FOR_nothing)
 	{
+	  /* If FROM is a SUBREG, put it into a register.  Do this
+	     so that we always generate the same set of insns for
+	     better cse'ing; if an intermediate assignment occurred,
+	     we won't be doing the operation directly on the SUBREG.  */
+	  if (optimize > 0 && GET_CODE (from) == SUBREG)
+	    from = force_reg (from_mode, from);
 	  emit_unop_insn (code, to, from, equiv_code);
 	  return;
 	}