re PR target/36557 (-m32 -mpowerpc64 produces better code than -m64 for a!=0)

	PR target/36557
	* config/rs6000/rs6000.md (*eqsi3_ext<mode>, *nesi3_ext<mode>): New.

From-SVN: r219336

gcc/ChangeLog

+2015-01-07  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/36557
+	* config/rs6000/rs6000.md (*eqsi3_ext<mode>, *nesi3_ext<mode>): New.
+
 2015-01-07  Sandra Loosemore  <sandra@codesourcery.com>
 
 	* doc/invoke.texi ([-fvtable-verify]): Fix markup on option

gcc/config/rs6000/rs6000.md

@@ -12576,6 +12576,66 @@
 	(if_then_else (match_test "operands[2] == const0_rtx")
 		      (const_string "8")
 		      (const_string "12")))])
+
+(define_insn_and_split "*eqsi3_ext<mode>"
+  [(set (match_operand:EXTSI 0 "gpc_reg_operand" "=r")
+	(eq:EXTSI (match_operand:SI 1 "gpc_reg_operand" "r")
+		  (match_operand:SI 2 "scc_eq_operand" "rKLI")))
+   (clobber (match_scratch:SI 3 "=r"))
+   (clobber (match_scratch:SI 4 "=r"))]
+  ""
+  "#"
+  ""
+  [(set (match_dup 4)
+	(clz:SI (match_dup 3)))
+   (set (match_dup 0)
+	(zero_extend:EXTSI
+	  (lshiftrt:SI (match_dup 4)
+		       (const_int 5))))]
+{
+  operands[3] = rs6000_emit_eqne (SImode,
+				  operands[1], operands[2], operands[3]);
+
+  if (GET_CODE (operands[4]) == SCRATCH)
+    operands[4] = gen_reg_rtx (SImode);
+}
+  [(set (attr "length")
+	(if_then_else (match_test "operands[2] == const0_rtx")
+		      (const_string "8")
+		      (const_string "12")))])
+
+(define_insn_and_split "*nesi3_ext<mode>"
+  [(set (match_operand:EXTSI 0 "gpc_reg_operand" "=r")
+	(ne:EXTSI (match_operand:SI 1 "gpc_reg_operand" "r")
+		  (match_operand:SI 2 "scc_eq_operand" "rKLI")))
+   (clobber (match_scratch:SI 3 "=r"))
+   (clobber (match_scratch:SI 4 "=r"))
+   (clobber (match_scratch:EXTSI 5 "=r"))]
+  ""
+  "#"
+  ""
+  [(set (match_dup 4)
+	(clz:SI (match_dup 3)))
+   (set (match_dup 5)
+	(zero_extend:EXTSI
+	  (lshiftrt:SI (match_dup 4)
+		       (const_int 5))))
+   (set (match_dup 0)
+	(xor:EXTSI (match_dup 5)
+		   (const_int 1)))]
+{
+  operands[3] = rs6000_emit_eqne (SImode,
+				  operands[1], operands[2], operands[3]);
+
+  if (GET_CODE (operands[4]) == SCRATCH)
+    operands[4] = gen_reg_rtx (SImode);
+  if (GET_CODE (operands[5]) == SCRATCH)
+    operands[5] = gen_reg_rtx (<MODE>mode);
+}
+  [(set (attr "length")
+	(if_then_else (match_test "operands[2] == const0_rtx")
+		      (const_string "12")
+		      (const_string "16")))])
 
 ;; Define both directions of branch and return.  If we need a reload
 ;; register, we'd rather use CR0 since it is much easier to copy a