i386.c (output_fp_compare): Add generation of ftst instruction.

	* config/i386/i386.c (output_fp_compare): Add generation
	of ftst instruction.
	* config/i386/i386.md (*cmpfp_0_sf, cmpfp_0_df, cmpfp_0_xf):
	Use output_fp_compare () function.
	(cmpfp_i, *cmpfp_i_sse, *cmpfp_i_sse_only): Fix insn constraint.
	(fix_truncdi_memory): Remove operands[5] copy.

From-SVN: r87482

gcc/ChangeLog

+2004-09-14  Uros Bizjak  <uros@kss-loka.si>
+
+	* config/i386/i386.c (output_fp_compare): Add generation
+	of ftst instruction.
+	* config/i386/i386.md (*cmpfp_0_sf, cmpfp_0_df, cmpfp_0_xf):
+	Use output_fp_compare () function.
+	(cmpfp_i, *cmpfp_i_sse, *cmpfp_i_sse_only): Fix insn constraint.
+	(fix_truncdi_memory): Remove operands[5] copy.
+
 2004-09-14  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* config/m32r/m32r.md, config/m68k/m68kelf.h,

gcc/config/i386/i386.c

@@ -7228,15 +7228,20 @@ const char *
 output_fp_compare (rtx insn, rtx *operands, int eflags_p, int unordered_p)
 {
   int stack_top_dies;
-  rtx cmp_op0 = operands[0];
-  rtx cmp_op1 = operands[1];
+  rtx cmp_op0, cmp_op1;
   int is_sse = SSE_REG_P (operands[0]) | SSE_REG_P (operands[1]);
 
   if (eflags_p == 2)
     {
-      cmp_op0 = cmp_op1;
+      cmp_op0 = operands[1];
       cmp_op1 = operands[2];
     }
+  else
+    {
+      cmp_op0 = operands[0];
+      cmp_op1 = operands[1];
+    }
+
   if (is_sse)
     {
       if (GET_MODE (operands[0]) == SFmode)
@@ -7256,6 +7261,17 @@ output_fp_compare (rtx insn, rtx *operands, int eflags_p, int unordered_p)
 
   stack_top_dies = find_regno_note (insn, REG_DEAD, FIRST_STACK_REG) != 0;
 
+  if (cmp_op1 == CONST0_RTX (GET_MODE (cmp_op1)))
+    {
+      if (stack_top_dies)
+	{
+	  output_asm_insn ("ftst\n\tfnstsw\t%0", operands);
+	  return TARGET_USE_FFREEP ? "ffreep\t%y1" : "fstp\t%y1";
+	}
+      else
+	return "ftst\n\tfnstsw\t%0";
+    }
+
   if (STACK_REG_P (cmp_op1)
       && stack_top_dies
       && find_regno_note (insn, REG_DEAD, REGNO (cmp_op1))

gcc/config/i386/i386.md

@@ -805,15 +805,7 @@
 	     (match_operand:SF 2 "const0_operand" "X"))]
 	UNSPEC_FNSTSW))]
   "TARGET_80387"
-{
-  if (find_regno_note (insn, REG_DEAD, REGNO (operands[1])))
-    {
-      output_asm_insn ("ftst\;fnstsw\t%0", operands);
-      return TARGET_USE_FFREEP ? "ffreep\t%y1" : "fstp\t%y1";
-    }
-  else
-    return "ftst\;fnstsw\t%0";
-}
+  "* return output_fp_compare (insn, operands, 2, 0);"
   [(set_attr "type" "multi")
    (set_attr "mode" "SF")])
 
@@ -825,15 +817,7 @@
 	     (match_operand:DF 2 "const0_operand" "X"))]
 	UNSPEC_FNSTSW))]
   "TARGET_80387"
-{
-  if (find_regno_note (insn, REG_DEAD, REGNO (operands[1])))
-    {
-      output_asm_insn ("ftst\;fnstsw\t%0", operands);
-      return TARGET_USE_FFREEP ? "ffreep\t%y1" : "fstp\t%y1";
-    }
-  else
-    return "ftst\;fnstsw\t%0";
-}
+  "* return output_fp_compare (insn, operands, 2, 0);"
   [(set_attr "type" "multi")
    (set_attr "mode" "DF")])
 
@@ -845,15 +829,7 @@
 	     (match_operand:XF 2 "const0_operand" "X"))]
 	UNSPEC_FNSTSW))]
   "TARGET_80387"
-{
-  if (find_regno_note (insn, REG_DEAD, REGNO (operands[1])))
-    {
-      output_asm_insn ("ftst\;fnstsw\t%0", operands);
-      return TARGET_USE_FFREEP ? "ffreep\t%y1" : "fstp\t%y1";
-    }
-  else
-    return "ftst\;fnstsw\t%0";
-}
+  "* return output_fp_compare (insn, operands, 2, 0);"
   [(set_attr "type" "multi")
    (set_attr "mode" "XF")])
 
@@ -1032,7 +1008,7 @@
   "TARGET_80387 && TARGET_CMOVE
    && !SSE_FLOAT_MODE_P (GET_MODE (operands[0]))
    && FLOAT_MODE_P (GET_MODE (operands[0]))
-   && GET_MODE (operands[0]) == GET_MODE (operands[0])"
+   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
   "* return output_fp_compare (insn, operands, 1, 0);"
   [(set_attr "type" "fcmp")
    (set (attr "mode")
@@ -1050,7 +1026,7 @@
 		      (match_operand 1 "nonimmediate_operand" "f#x,xm#f")))]
   "TARGET_80387
    && SSE_FLOAT_MODE_P (GET_MODE (operands[0]))
-   && GET_MODE (operands[0]) == GET_MODE (operands[0])"
+   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
   "* return output_fp_compare (insn, operands, 1, 0);"
   [(set_attr "type" "fcmp,ssecomi")
    (set (attr "mode")
@@ -1064,7 +1040,7 @@
 	(compare:CCFP (match_operand 0 "register_operand" "x")
 		      (match_operand 1 "nonimmediate_operand" "xm")))]
   "SSE_FLOAT_MODE_P (GET_MODE (operands[0]))
-   && GET_MODE (operands[0]) == GET_MODE (operands[0])"
+   && GET_MODE (operands[0]) == GET_MODE (operands[1])"
   "* return output_fp_compare (insn, operands, 1, 0);"
   [(set_attr "type" "ssecomi")
    (set (attr "mode")
@@ -4161,7 +4137,7 @@
    (clobber (match_scratch:DF 4 "=&1f"))]
   "TARGET_80387 && FLOAT_MODE_P (GET_MODE (operands[1]))
    && (!SSE_FLOAT_MODE_P (GET_MODE (operands[1])) || !TARGET_64BIT)"
-  "* operands[5] = operands[4]; return output_fix_trunc (insn, operands);"
+  "* return output_fix_trunc (insn, operands);"
   [(set_attr "type" "fistp")
    (set_attr "i387_cw" "trunc")
    (set_attr "mode" "DI")])