Support -mxl-reorder and swap instructions.

	*  config/microblaze/microblaze.c:
	Check mcpu, pcmp requirement and set TARGET_REORDER to 0 if not met.
	*  config/microblaze/microblaze.h: Add -mxl-reorder to DRIVER_SELF_SPECS
	*  config/microblaze/microblaze.md: New bswapsi2 and bswaphi2
	instructions emitted if TARGET_REORDER
	*  config/microblaze/microblaze.opt: New option -mxl-reorder set to 1 
	or 0 for -m/-mno case, but initialises as 2 to detect default use case 
	separately

From-SVN: r196415

gcc/ChangeLog

+2013-03-02  David Holsgrove <david.holsgrove@xilinx.com>
+
+	*  config/microblaze/microblaze.c:
+	Check mcpu, pcmp requirement and set TARGET_REORDER to 0 if not met.
+	*  config/microblaze/microblaze.h: Add -mxl-reorder to DRIVER_SELF_SPECS
+	*  config/microblaze/microblaze.md: New bswapsi2 and bswaphi2
+	instructions emitted if TARGET_REORDER
+	*  config/microblaze/microblaze.opt: New option -mxl-reorder set to 1 
+	or 0 for -m/-mno case, but initialises as 2 to detect default use case 
+	separately
+
 2013-03-01  Xinliang David Li  <davidxl@google.com>
 
 	* tree-ssa-uninit.c (compute_control_dep_chain): Limit post-dom

gcc/config/microblaze/microblaze.c

@@ -1380,6 +1380,21 @@ microblaze_option_override (void)
         microblaze_has_clz = 0;
     }
 
+  /* TARGET_REORDER defaults to 2 if -mxl-reorder not specified.  */
+  ver = MICROBLAZE_VERSION_COMPARE (microblaze_select_cpu, "v8.30.a");
+  if (ver < 0)
+    {
+        if (TARGET_REORDER == 1)
+          warning (0, "-mxl-reorder can be used only with -mcpu=v8.30.a or greater");
+        TARGET_REORDER = 0;
+    }
+  else if ((ver == 0) && !TARGET_PATTERN_COMPARE)
+    {
+        if (TARGET_REORDER == 1)
+          warning (0, "-mxl-reorder requires -mxl-pattern-compare for -mcpu=v8.30.a");
+        TARGET_REORDER = 0;
+    }
+
   if (TARGET_MULTIPLY_HIGH && TARGET_SOFT_MUL)
     error ("-mxl-multiply-high requires -mno-xl-soft-mul");
 

gcc/config/microblaze/microblaze.h

@@ -78,6 +78,7 @@ extern enum pipeline_type microblaze_pipe;
 	"%{mno-xl-barrel-shift:%<mxl-barrel-shift}", 	\
 	"%{mno-xl-pattern-compare:%<mxl-pattern-compare}", \
 	"%{mxl-soft-div:%<mno-xl-soft-div}", 		\
+	"%{mxl-reorder:%<mno-xl-reorder}", 		\
 	"%{msoft-float:%<mhard-float}"
 
 /* Tell collect what flags to pass to nm.  */

gcc/config/microblaze/microblaze.md

@@ -353,6 +353,20 @@
 (automata_option "time")
 (automata_option "progress")
 
+(define_insn "bswapsi2"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+        (bswap:SI (match_operand:SI 1 "register_operand" "r")))]
+  "TARGET_REORDER"
+  "swapb %0, %1"
+)
+
+(define_insn "bswaphi2"
+  [(set (match_operand:HI 0 "register_operand" "=r")
+        (bswap:HI (match_operand:HI 1 "register_operand" "r")))]
+  "TARGET_REORDER"
+  "swaph %0, %1"
+)
+
 ;;----------------------------------------------------------------
 ;; Microblaze delay slot description
 ;;----------------------------------------------------------------

gcc/config/microblaze/microblaze.opt

@@ -67,6 +67,10 @@ mxl-soft-mul
 Target Mask(SOFT_MUL)
 Use the soft multiply emulation (default)
 
+mxl-reorder
+Target Var(TARGET_REORDER) Init(2)
+Use reorder instructions (swap and byte reversed load/store) (default)
+
 mxl-soft-div
 Target Mask(SOFT_DIV)
 Use the software emulation for divides (default)