(output_float_compare): Added support for Pentium Pro

fcomi instruction which sets EFLAGS instead of FPU Status Word.

From-SVN: r12563

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index c86e6d684d583d6354479d094ed6d7c7653f9ccf..4499248c38a52b4d1ba8c6f82e492d2ac863ced5 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -3548,6 +3548,7 @@ output_float_compare (insn, operands)
   int stack_top_dies;
   rtx body = XVECEXP (PATTERN (insn), 0, 0);
   int unordered_compare = GET_MODE (SET_SRC (body)) == CCFPEQmode;
+  int target_fcomi = TARGET_CMOVE && STACK_REG_P (operands[1]);
 
   rtx tmp;
   if (! STACK_TOP_P (operands[0]))
@@ -3585,9 +3586,9 @@ output_float_compare (insn, operands)
         unordered float compare. */
 
       if (unordered_compare)
-       strcpy (buf, "fucom");
+       strcpy (buf, target_fcomi ? "fucomi" : "fucom");
       else if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_FLOAT)
-       strcpy (buf, "fcom");
+       strcpy (buf, target_fcomi ? "fcomi" : "fcom");
       else
        strcpy (buf, "ficom");
 
@@ -3598,6 +3599,13 @@ output_float_compare (insn, operands)
 
       if (NON_STACK_REG_P (operands[1]))
        output_op_from_reg (operands[1], strcat (buf, AS1 (%z0,%1)));
+      else if (target_fcomi) 
+       {
+         rtx xops[] = {operands[0], operands[1], operands[0]};
+         
+         output_asm_insn (strcat (buf, AS2 (%z1,%y1,%2)), xops);
+         RET;
+       }
       else
         output_asm_insn (strcat (buf, AS1 (%z1,%y1)), operands);
     }