From: Richard Kenner <kenner@gcc.gnu.org>
Date: Fri, 20 Oct 1995 23:14:10 +0000 (-0400)
Subject: (distribute_notes): Delete instructions without side effect that set a
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d02089a5f24db5cea75174304a367b8b5555ddb8;p=gcc.git

(distribute_notes): Delete instructions without side effect that set a
subreg of an unused register.

From-SVN: r10491
---

diff --git a/gcc/combine.c b/gcc/combine.c
index cd7dc12eb3e..3cdfb32dd3e 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -10745,7 +10745,10 @@ distribute_notes (notes, from_insn, i3, i2, elim_i2, elim_i1)
 			 modified the register.  */
 
 		      if (set != 0 && ! side_effects_p (SET_SRC (set))
-			  && rtx_equal_p (XEXP (note, 0), SET_DEST (set)))
+			  && (rtx_equal_p (XEXP (note, 0), SET_DEST (set))
+			      || (GET_CODE (SET_DEST (set)) == SUBREG
+				  && rtx_equal_p (XEXP (note, 0),
+						  XEXP (SET_DEST (set), 0)))))
 			{
 			  /* Move the notes and links of TEM elsewhere.
 			     This might delete other dead insns recursively.