From: Chenghua Xu <paul.hua.gm@gmail.com>
Date: Tue, 14 May 2019 01:42:59 +0000 (+0000)
Subject: [MIPS] Skip forward src into next insn when the SRC reg is dead.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4dbf3a15f1b6afa0100c1b026ba13450677931c9;p=gcc.git

[MIPS] Skip forward src into next insn when the SRC reg is dead.

	PR target/90357
	gcc/
	* config/mips/mips.c (mips_split_move): Skip forward SRC into
	next insn when the SRC reg is dead.

From-SVN: r271146
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0985651503a..db8f647ec78 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-05-14  Chenghua Xu  <paul.hua.gm@gmail.com>
+
+	PR target/90357
+	* config/mips/mips.c (mips_split_move): Skip forward SRC into
+	next insn when the SRC reg is dead.
+
 2019-05-14  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	* gimple-ssa-strength-reduction.c (lookup_cand): Adjust index by 1.
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 1de33b28c38..89fc073c62b 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -4849,6 +4849,7 @@ mips_split_move (rtx dest, rtx src, enum mips_split_type split_type, rtx insn_)
      can forward SRC for DEST.  This is most useful if the next insn is a
      simple store.   */
   rtx_insn *insn = (rtx_insn *)insn_;
+  struct mips_address_info addr;
   if (insn)
     {
       rtx_insn *next = next_nonnote_nondebug_insn_bb (insn);
@@ -4856,7 +4857,17 @@ mips_split_move (rtx dest, rtx src, enum mips_split_type split_type, rtx insn_)
 	{
 	  rtx set = single_set (next);
 	  if (set && SET_SRC (set) == dest)
-	    validate_change (next, &SET_SRC (set), src, false);
+	    {
+	      if (MEM_P (src))
+		{
+		  rtx tmp = XEXP (src, 0);
+		  mips_classify_address (&addr, tmp, GET_MODE (tmp), true);
+		  if (REGNO (addr.reg) != REGNO (dest))
+		    validate_change (next, &SET_SRC (set), src, false);
+		}
+	      else
+		validate_change (next, &SET_SRC (set), src, false);
+	    }
 	}
     }
 }