Add support for the CLZ insn

Add support for the CLZ insn
* config/microblaze/microblaze.c: microblaze_has_clz = 0
Add version check for v8.10.a to enable microblaze_has_clz
* config/microblaze/microblaze.h: Add TARGET_HAS_CLZ as
combined version and TARGET_PATTERN_COMPARE check
* config/microblaze/microblaze.md: New clzsi2 instruction

From-SVN: r196158

gcc/ChangeLog

 2012-02-19  Edgar E. Iglesias <edgar.iglesias@gmail.com>
+	* config/microblaze/microblaze.c: microblaze_has_clz = 0
+	Add version check for v8.10.a to enable microblaze_has_clz
+	* config/microblaze/microblaze.h: Add TARGET_HAS_CLZ as combined 
+	version and TARGET_PATTERN_COMPARE check
+	* config/microblaze/microblaze.md: New clzsi2 instruction
+	
+2012-02-19  Edgar E. Iglesias <edgar.iglesias@gmail.com>
 
 	*  config/microblaze/microblaze.md (call_value_intern): Check symbol is 
 	function before branching.

gcc/config/microblaze/microblaze.c

@@ -143,6 +143,9 @@ int microblaze_section_threshold = -1;
    delay slots.  -mcpu=v3.00.a or v4.00.a turns this on.  */
 int microblaze_no_unsafe_delay;
 
+/* Set to one if the targeted core has the CLZ insn.  */
+int microblaze_has_clz = 0;
+
 /* Which CPU pipeline do we use. We haven't really standardized on a CPU 
    version having only a particular type of pipeline. There can still be 
    options on the CPU to scale pipeline features up or down. :( 
@@ -1369,6 +1372,14 @@ microblaze_option_override (void)
 		 "-mxl-multiply-high can be used only with -mcpu=v6.00.a or greater");
     }
 
+  ver = MICROBLAZE_VERSION_COMPARE (microblaze_select_cpu, "v8.10.a");
+  microblaze_has_clz = 1;
+  if (ver < 0)
+    {
+        /* MicroBlaze prior to 8.10.a didn't have clz.  */
+        microblaze_has_clz = 0;
+    }
+
   if (TARGET_MULTIPLY_HIGH && TARGET_SOFT_MUL)
     error ("-mxl-multiply-high requires -mno-xl-soft-mul");
 

gcc/config/microblaze/microblaze.h

@@ -42,6 +42,7 @@ extern int microblaze_section_threshold;
 extern int microblaze_dbx_regno[];
 
 extern int microblaze_no_unsafe_delay;
+extern int microblaze_has_clz;
 extern enum pipeline_type microblaze_pipe;
 
 #define OBJECT_FORMAT_ELF
@@ -58,6 +59,9 @@ extern enum pipeline_type microblaze_pipe;
 #define TARGET_DEFAULT      (MASK_SOFT_MUL | MASK_SOFT_DIV | MASK_SOFT_FLOAT \
                              | TARGET_ENDIAN_DEFAULT)
 
+/* Do we have CLZ?  */
+#define TARGET_HAS_CLZ      (TARGET_PATTERN_COMPARE && microblaze_has_clz)
+
 /* The default is to support PIC.  */
 #define TARGET_SUPPORTS_PIC 1
 

gcc/config/microblaze/microblaze.md

@@ -2200,3 +2200,13 @@
   [(set_attr "type" "multi")
    (set_attr "length" "12")])
 
+;; This insn gives the count of leading number of zeros for the second
+;; operand and stores the result in first operand.
+(define_insn "clzsi2"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+        (clz:SI (match_operand:SI 1 "register_operand" "r")))]
+  "TARGET_HAS_CLZ"
+  "clz\t%0,%1"
+  [(set_attr "type"     "arith")
+  (set_attr "mode"      "SI")
+  (set_attr "length"    "4")])