(pushxf,movxf,extenddfxf2,extendsfxf2): Handle XFmode write to MEM by eading...

(pushxf,movxf,extenddfxf2,extendsfxf2): Handle XFmode write to MEM by
eading back value after write if source doesn't die.
(movxf,extenddfxf2,extendsfxf2): Don't emit fld before calling
output_to_reg: output_to_reg does that now.

From-SVN: r5601

gcc/config/i386/i386.md

@@ -1154,13 +1154,10 @@
       xops[2] = stack_pointer_rtx;
 
       output_asm_insn (AS2 (sub%L2,%1,%2), xops);
-      if (find_regno_note (insn, REG_DEAD, FIRST_STACK_REG))
-        output_asm_insn (AS1 (fstp%T0,%0), xops);
-      else
-        {
-          output_asm_insn (AS1 (fld,%y1), operands);
-          output_asm_insn (AS1 (fstp%T0,%y0), xops);
-         }
+      output_asm_insn (AS1 (fstp%T0,%0), xops);
+      if (! find_regno_note (insn, REG_DEAD, FIRST_STACK_REG))
+	output_asm_insn (AS1 (fld%T0,%0), xops);
+
       RET;
     }
   else
@@ -1211,11 +1208,6 @@
 
   if (STACK_TOP_P (operands[1]) && NON_STACK_REG_P (operands[0]))
     {
-      if (stack_top_dies == 0)
-	{
-	  output_asm_insn (AS1 (fld,%y1), operands);
-	  stack_top_dies = 1;
-	}
       output_to_reg (operands[0], stack_top_dies);
       RET;
     }
@@ -1224,13 +1216,11 @@
 
   if (STACK_TOP_P (operands[1]))
     {
-      if (stack_top_dies)
-	return AS1 (fstp%z0,%y0);
-      else
-	{
-        output_asm_insn (AS1 (fld,%y1), operands);
-	return AS1 (fstp%z0,%y0);
-	}
+      output_asm_insn (AS1 (fstp%z0,%y0), operands);
+      if (! stack_top_dies)
+	return AS1 (fld%z0,%y0);
+
+      RET;
     }
 
   /* Handle other kinds of reads to the 387 */
@@ -1491,11 +1481,6 @@
 
   if (NON_STACK_REG_P (operands[0]))
     {
-      if (stack_top_dies == 0)
-	{
-	  output_asm_insn (AS1 (fld,%y1), operands);
-	  stack_top_dies = 1;
-	}
       output_to_reg (operands[0], stack_top_dies);
       RET;
     }
@@ -1505,13 +1490,10 @@
 
   if (GET_CODE (operands[0]) == MEM)
     {
-      if (stack_top_dies)
-	return AS1 (fstp%z0,%y0);
-      else
-	{
-	  output_asm_insn (AS1 (fld,%y1), operands);
-	  return AS1 (fstp%z0,%0);
-	}
+      output_asm_insn (AS1 (fstp%z0,%y0), operands);
+      if (! stack_top_dies)
+	return AS1 (fld%z0,%y0);
+      RET;
     }
 
   abort ();
@@ -1534,11 +1516,6 @@
 
   if (NON_STACK_REG_P (operands[0]))
     {
-      if (stack_top_dies == 0)
-	{
-	  output_asm_insn (AS1 (fld,%y1), operands);
-	  stack_top_dies = 1;
-	}
       output_to_reg (operands[0], stack_top_dies);
       RET;
     }
@@ -1548,13 +1525,10 @@
 
   if (GET_CODE (operands[0]) == MEM)
     {
-      if (stack_top_dies)
-	return AS1 (fstp%z0,%y0);
-      else
-	{
-	  output_asm_insn (AS1 (fld,%y1), operands);
-	  return AS1 (fstp%z0,%0);
-	}
+      output_asm_insn (AS1 (fstp%z0,%y0), operands);
+      if (! stack_top_dies)
+	return AS1 (fld%z0,%y0);
+      RET;
     }
 
   abort ();