From: Richard Stallman <rms@gnu.org>
Date: Sun, 11 Apr 1993 18:46:06 +0000 (+0000)
Subject: (can_combine_p):  Don't move an UNSPEC_VOLATILE.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a66a10c7075ee4056c1ce30f32d415612f3dd8c3;p=gcc.git

(can_combine_p):  Don't move an UNSPEC_VOLATILE.

From-SVN: r4085
---

diff --git a/gcc/combine.c b/gcc/combine.c
index a33bcc1e293..86f920cf5c5 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -825,10 +825,12 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc)
 	 If the insns are adjacent, a use can't cross a set even though we
 	 think it might (this can happen for a sequence of insns each setting
 	 the same destination; reg_last_set of that register might point to
-	 a NOTE).  Also, don't move a volatile asm across any other insns.  */
+	 a NOTE).  Also, don't move a volatile asm or UNSPEC_VOLATILE across
+	 any other insns.  */
       || (! all_adjacent
 	  && (use_crosses_set_p (src, INSN_CUID (insn))
-	      || (GET_CODE (src) == ASM_OPERANDS && MEM_VOLATILE_P (src))))
+	      || (GET_CODE (src) == ASM_OPERANDS && MEM_VOLATILE_P (src))
+	      || GET_CODE (src) == UNSPEC_VOLATILE))
       /* If there is a REG_NO_CONFLICT note for DEST in I3 or SUCC, we get
 	 better register allocation by not doing the combine.  */
       || find_reg_note (i3, REG_NO_CONFLICT, dest)