From: Richard Kenner <kenner@gcc.gnu.org>
Date: Tue, 16 Apr 1996 21:43:09 +0000 (-0400)
Subject: (addsidi3_2): Handle non-MEM overlap case.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=70cff8f545f04281a8cf0e8d6ee604ee8026fe32;p=gcc.git

(addsidi3_2): Handle non-MEM overlap case.

From-SVN: r11829
---

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 7f6cd8057b4..f307767df3a 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -2764,6 +2764,36 @@
 
       if (GET_CODE (operands[0]) != MEM || GET_CODE (operands[1]) != MEM)
 	{
+	  if (rtx_equal_p (low[0], operands[2]))
+	    {
+	      output_asm_insn (AS2 (mov%L0,%2,%0), high);
+	      output_asm_insn (AS2 (add%L0,%1,%0), low);
+	      output_asm_insn (AS2 (adc%L0,%1,%0), high);
+	      RET;
+	    }
+	  if (rtx_equal_p (high[0], operands[2]))
+	    {
+	      if (GET_CODE (operands[0]) != MEM)
+		{
+		  output_asm_insn (AS2 (mov%L0,%2,%0), low);
+		  output_asm_insn (AS2 (mov%L0,%2,%0), high);
+		  output_asm_insn (AS2 (add%L0,%1,%0), low);
+		  output_asm_insn (AS2 (adc%L0,%1,%0), high);
+		}
+	      else
+		{
+		  /* It's too late to ask for a scratch now - but this
+		     will probably not happen too often.  */
+		  output_asm_insn (AS2 (add%L1,%2,%1), low);
+		  output_asm_insn (AS2 (mov%L0,%1,%0), low);
+		  output_asm_insn (AS2 (mov%L1,%2,%1), low);
+		  output_asm_insn (AS2 (mov%L0,%2,%0), high);
+		  output_asm_insn (AS2 (adc%L0,%1,%0), high);
+		  output_asm_insn (AS2 (sub%L1,%0,%1), low);
+		  output_asm_insn (AS1 (neg%L1,%1), low);
+		}
+	      RET;
+	    }
 	  output_asm_insn (AS2 (mov%L1,%3,%1), xops);
 	  output_asm_insn (AS2 (mov%L0,%2,%0), xops);
 	}