Add missing ChangeLog entry for r190406

From-SVN: r190436

gcc/ChangeLog

@@ -306,6 +306,13 @@
 	(neon_vdup_n<mode> VX, V32): Likewise.
 	(neon_vdup_nv2di): Likewise.
 
+2012-08-14  Maxim Kuvyrkov  <maxim@codesourcery.com>
+
+	* config/mips/mips.md (define_attr accum_in): New instruction
+	attribute.  Set it for imadd and fmadd patterns.
+	* config/mips/mips.c (mips_linked_madd_p): Use accum_in to extract
+	accumulator register.
+
 2012-08-14   Diego Novillo  <dnovillo@google.com>
 
 	Merge from cxx-conversion branch.  Configury.

gcc/config/mips/mips-dspr2.md

@@ -68,6 +68,7 @@
   UNSPEC_DPAQX_SA_W_PH
   UNSPEC_DPSQX_S_W_PH
   UNSPEC_DPSQX_SA_W_PH
+  UNSPEC_ACC_INIT
 ])
 
 (define_insn "mips_absq_s_qb"
@@ -630,3 +631,33 @@
   [(set_attr "type"	"dspmacsat")
    (set_attr "accum_in" "1")
    (set_attr "mode"	"SI")])
+
+;; Convert  mtlo $ac[1-3],$0  =>  mult $ac[1-3],$0,$0
+;;          mthi $ac[1-3],$0
+(define_peephole2
+  [(set (match_operand:SI 0 "register_operand" "")
+	(const_int 0))
+   (set (match_operand:SI 1 "register_operand" "")
+	(const_int 0))]
+  "ISA_HAS_DSPR2
+   && !TARGET_MIPS16
+   && !TARGET_64BIT
+   && true_regnum (operands[0]) >= DSP_ACC_REG_FIRST
+   && true_regnum (operands[0]) <= DSP_ACC_REG_LAST
+   && true_regnum (operands[0]) / 2 == true_regnum (operands[1]) / 2"
+  [(parallel [(set (match_dup 0) (const_int 0))
+	      (set (match_dup 1) (const_int 0))
+	      (unspec [(const_int 0)] UNSPEC_ACC_INIT)])]
+)
+
+(define_insn "*mips_acc_init"
+  [(parallel
+    [(set (match_operand:SI 0 "register_operand" "=a") (const_int 0))
+     (set (match_operand:SI 1 "register_operand" "=a") (const_int 0))
+     (unspec [(const_int 0)] UNSPEC_ACC_INIT)])]
+  "ISA_HAS_DSPR2
+   && !TARGET_MIPS16
+   && !TARGET_64BIT"
+  "mult\t%q0,$0,$0\t\t# Clear ACC HI/LO"
+  [(set_attr "type"	"imul")
+   (set_attr "mode"	"SI")])