xtensa: Convert to fma.

        * config.gcc [xtensa] (extra_options): Add fused-madd.opt.
        * config/xtensa/xtensa.opt (mfused-madd): Remove.
        * config/xtensa/xtensa.c (TARGET_DEFAULT_TARGET_FLAGS): Remove
        MASK_FUSED_MADD.
        * config/xtensa/xtensa.md (fmasf4): Rename from muladdsf3; use
        * fma.
        (fnmasf4): Rename from mulsubsf3; use fma.

From-SVN: r166666

gcc/ChangeLog

+2010-11-12  Richard Henderson  <rth@redhat.com>
+
+	* config.gcc [xtensa] (extra_options): Add fused-madd.opt.
+	* config/xtensa/xtensa.opt (mfused-madd): Remove.
+	* config/xtensa/xtensa.c (TARGET_DEFAULT_TARGET_FLAGS): Remove
+	MASK_FUSED_MADD.
+	* config/xtensa/xtensa.md (fmasf4): Rename from muladdsf3; use fma.
+	(fnmasf4): Rename from mulsubsf3; use fma.
+
 2010-11-12  Joern Rennecke  <amylaar@spamcop.net>
 	    Richard Henderson  <rth@redhat.com>
 

gcc/config.gcc

@@ -399,6 +399,9 @@ sh[123456789lbe]*-*-* | sh-*-*)
 	cpu_type=sh
 	need_64bit_hwint=yes
 	;;
+xtensa*-*-*)
+	extra_options="${extra_options} fused-madd.opt"
+	;;
 esac
 
 tm_file=${cpu_type}/${cpu_type}.h

gcc/config/xtensa/xtensa.c

@@ -193,7 +193,7 @@ static const struct default_options xtensa_option_optimization_table[] =
 #define TARGET_ASM_SELECT_RTX_SECTION  xtensa_select_rtx_section
 
 #undef TARGET_DEFAULT_TARGET_FLAGS
-#define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT | MASK_FUSED_MADD)
+#define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT)
 
 #undef TARGET_LEGITIMIZE_ADDRESS
 #define TARGET_LEGITIMIZE_ADDRESS xtensa_legitimize_address

gcc/config/xtensa/xtensa.md

@@ -315,24 +315,25 @@
    (set_attr "mode"	"SF")
    (set_attr "length"	"3")])
 
-(define_insn "muladdsf3"
+(define_insn "fmasf4"
   [(set (match_operand:SF 0 "register_operand" "=f")
-	(plus:SF (mult:SF (match_operand:SF 1 "register_operand" "%f")
-			  (match_operand:SF 2 "register_operand" "f"))
-		 (match_operand:SF 3 "register_operand" "0")))]
-  "TARGET_HARD_FLOAT && TARGET_FUSED_MADD"
+	(fma:SF (match_operand:SF 1 "register_operand" "f")
+		(match_operand:SF 2 "register_operand" "f")
+		(match_operand:SF 3 "register_operand" "0")))]
+  "TARGET_HARD_FLOAT"
   "madd.s\t%0, %1, %2"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"SF")
    (set_attr "length"	"3")])
 
-(define_insn "mulsubsf3"
+;; Note that (C - A*B) = (-A*B + C)
+(define_insn "fnmasf4"
   [(set (match_operand:SF 0 "register_operand" "=f")
-	(minus:SF (match_operand:SF 1 "register_operand" "0")
-		  (mult:SF (match_operand:SF 2 "register_operand" "%f")
-			   (match_operand:SF 3 "register_operand" "f"))))]
-  "TARGET_HARD_FLOAT && TARGET_FUSED_MADD"
-  "msub.s\t%0, %2, %3"
+	(fma:SF (neg:SF (match_operand:SF 1 "register_operand" "f"))
+		(match_operand:SF 2 "register_operand" "f")
+		(match_operand:SF 3 "register_operand" "0")))]
+  "TARGET_HARD_FLOAT"
+  "msub.s\t%0, %1, %2"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"SF")
    (set_attr "length"	"3")])

gcc/config/xtensa/xtensa.opt

@@ -22,10 +22,6 @@ mconst16
 Target Report Mask(CONST16)
 Use CONST16 instruction to load constants
 
-mfused-madd
-Target Report Mask(FUSED_MADD)
-Enable fused multiply/add and multiply/subtract FP instructions
-
 mforce-no-pic
 Target Report Mask(FORCE_NO_PIC)
 Disable position-independent code (PIC) for use in OS kernel code