Fix some typo and brain twister logical.

gcc/
	* config/mips/mips.c: Fix typo in documentation of
	mips_loongson_ext2_prefetch_cookie.
	(mips_option_override): fix brain twister logical.
	* config/mips/mips.h: Fix typo in documentation of
	ISA_HAS_CTZ_CTO and define pattern.
	* config/mips/mips.md (prefetch): Hoist EXT2 above
	the 2EF/EXT block.
	(prefetch_indexed): Hoist EXT2 above the EXT block.

gcc/testsuite/
	* gcc.target/mips/loongson-ctz.c: Fix typo.
	* gcc.target/mips/loongson-dctz.c: Fix typo.

From-SVN: r265871

gcc/ChangeLog

+2018-11-07  Chenghua Xu  <paul.hua.gm@gmail.com>
+
+	* config/mips/mips.c: Fix typo in documentation of
+	mips_loongson_ext2_prefetch_cookie.
+	(mips_option_override): fix brain twister logical.
+	* config/mips/mips.h: Fix typo in documentation of
+	ISA_HAS_CTZ_CTO and define pattern.
+	* config/mips/mips.md (prefetch): Hoist EXT2 above
+	the 2EF/EXT block.
+	(prefetch_indexed): Hoist EXT2 above the EXT block.
+
 2018-11-07  Jan Hubicka  <jh@suse.cz>
 
 	* tree.c (free_lang_data_in_type): Add fld parameter; simplify

gcc/config/mips/mips.c

@@ -15151,7 +15151,7 @@ mips_prefetch_cookie (rtx write, rtx locality)
   return GEN_INT (INTVAL (write) + 6);
 }
 
-/* Loongson EXT2 only implements perf hint=0 (prefetch for load) and hint=1
+/* Loongson EXT2 only implements pref hint=0 (prefetch for load) and hint=1
    (prefetch for store), other hint just scale to hint = 0 and hint = 1.  */
 
 rtx
@@ -20202,7 +20202,7 @@ mips_option_override (void)
 	 is true.  If a user explicitly says -mloongson-ext2 -mno-loongson-ext
 	 then that is an error.  */
       if (!TARGET_LOONGSON_EXT
-	  && !((target_flags_explicit & MASK_LOONGSON_EXT) == 0))
+	  && (target_flags_explicit & MASK_LOONGSON_EXT) != 0)
 	error ("%<-mloongson-ext2%> must be used with %<-mloongson-ext%>");
       target_flags |= MASK_LOONGSON_EXT;
     }

gcc/config/mips/mips.h

@@ -1158,7 +1158,7 @@ struct mips_cpu_info {
 /* ISA has count leading zeroes/ones instruction (not implemented).  */
 #define ISA_HAS_CLZ_CLO		(mips_isa_rev >= 1 && !TARGET_MIPS16)
 
-/* ISA has count tailing zeroes/ones instruction.  */
+/* ISA has count trailing zeroes/ones instruction.  */
 #define ISA_HAS_CTZ_CTO		(TARGET_LOONGSON_EXT2)
 
 /* ISA has three operand multiply instructions that put

gcc/config/mips/mips.md

@@ -3153,7 +3153,7 @@
 ;;
 ;;  ...................
 ;;
-;;  Count tailing zeroes.
+;;  Count trailing zeroes.
 ;;
 ;;  ...................
 ;;
@@ -7157,21 +7157,21 @@
 	     (match_operand 2 "const_int_operand" "n"))]
   "ISA_HAS_PREFETCH && TARGET_EXPLICIT_RELOCS"
 {
-  if (TARGET_LOONGSON_2EF || TARGET_LOONGSON_EXT || TARGET_LOONGSON_EXT2)
+  if (TARGET_LOONGSON_2EF || TARGET_LOONGSON_EXT)
     {
-      /* Loongson ext2 implementation pref insnstructions.  */
-      if (TARGET_LOONGSON_EXT2)
-	{
-  	  operands[1] = mips_loongson_ext2_prefetch_cookie (operands[1],
-							    operands[2]);
-	  return "pref\t%1, %a0";
-	}
       /* Loongson 2[ef] and Loongson ext use load to $0 for prefetching.  */
       if (TARGET_64BIT)
 	return "ld\t$0,%a0";
       else
 	return "lw\t$0,%a0";
     }
+  /* Loongson ext2 implementation pref instructions.  */
+  if (TARGET_LOONGSON_EXT2)
+    {
+      operands[1] = mips_loongson_ext2_prefetch_cookie (operands[1],
+							operands[2]);
+      return "pref\t%1, %a0";
+    }
   operands[1] = mips_prefetch_cookie (operands[1], operands[2]);
   return "pref\t%1,%a0";
 }
@@ -7184,21 +7184,21 @@
 	     (match_operand 3 "const_int_operand" "n"))]
   "ISA_HAS_PREFETCHX && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT"
 {
-  if (TARGET_LOONGSON_EXT || TARGET_LOONGSON_EXT2)
+  if (TARGET_LOONGSON_EXT)
     {
-      /* Loongson ext2 implementation pref insnstructions.  */
-      if (TARGET_LOONGSON_EXT2)
-	{
-  	  operands[2] = mips_loongson_ext2_prefetch_cookie (operands[2],
-							    operands[3]);
-	  return "prefx\t%2,%1(%0)";
-	}
       /* Loongson Loongson ext use index load to $0 for prefetching.  */
       if (TARGET_64BIT)
 	return "gsldx\t$0,0(%0,%1)";
       else
 	return "gslwx\t$0,0(%0,%1)";
     }
+  /* Loongson ext2 implementation pref instructions.  */
+  if (TARGET_LOONGSON_EXT2)
+    {
+      operands[2] = mips_loongson_ext2_prefetch_cookie (operands[2],
+							operands[3]);
+      return "prefx\t%2,%1(%0)";
+    }
   operands[2] = mips_prefetch_cookie (operands[2], operands[3]);
   return "prefx\t%2,%1(%0)";
 }

gcc/testsuite/ChangeLog

+2018-11-07  Chenghua Xu  <paul.hua.gm@gmail.com>
+
+	* gcc.target/mips/loongson-ctz.c: Fix typo.
+	* gcc.target/mips/loongson-dctz.c: Fix typo.
+
 2018-11-07  Jan Hubicka  <jh@suse.cz>
 
 	* g++.dg/lto/odr-1_1.C: Fix template.

gcc/testsuite/gcc.target/mips/loongson-ctz.c

-/* Test cases for Loongson EXT2 instrutions.  */
+/* Test cases for Loongson EXT2 instructions.  */
 
 /* { dg-do compile } */
 /* { dg-options "-mloongson-ext2" } */

gcc/testsuite/gcc.target/mips/loongson-dctz.c

-/* Test cases for Loongson EXT2 instrutions.  */
+/* Test cases for Loongson EXT2 instructions.  */
 
 /* { dg-do compile } */
 /* { dg-options "-mloongson-ext2" } */