rx.md: Add peephole to remove redundant extensions after loads.

	* config/rx/rx.md: Add peephole to remove redundant extensions
	after loads.

From-SVN: r173820

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8ceeac3..637241f 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2011-05-17  Nick Clifton  <nickc@redhat.com>
+
+       * config/rx/rx.md: Add peephole to remove redundant extensions
+       after loads.
+
 2011-05-17  Kazuhio Inaoka  <kazuhiro.inaoka.ud@renesas.com>
            Nick Clifton  <nickc@redhat.com>
 

diff --git a/gcc/config/rx/rx.md b/gcc/config/rx/rx.md
index fdbf287..227fe31 100644 (file)
--- a/gcc/config/rx/rx.md
+++ b/gcc/config/rx/rx.md
@@ -1701,6 +1701,35 @@
                    (extend_types:SI (match_dup 1))))]
 )
 
+;; Convert:
+;;   (set (reg1) (sign_extend (mem))
+;;   (set (reg2) (zero_extend (reg1))
+;; into
+;;   (set (reg2) (zero_extend (mem)))
+(define_peephole2
+  [(set (match_operand:SI                              0 "register_operand")
+       (sign_extend:SI (match_operand:small_int_modes 1 "memory_operand")))
+   (set (match_operand:SI                              2 "register_operand")
+       (zero_extend:SI (match_operand:small_int_modes 3 "register_operand")))]
+  "REGNO (operands[0]) == REGNO (operands[3])
+   && (REGNO (operands[0]) == REGNO (operands[2])
+       || peep2_regno_dead_p (2, REGNO (operands[0])))"
+  [(set (match_dup 2)
+       (zero_extend:SI (match_dup 1)))]
+)
+
+;; Remove the redundant sign extension from:
+;;   (set (reg) (extend (mem)))
+;;   (set (reg) (extend (reg)))
+(define_peephole2
+  [(set (match_operand:SI                               0 "register_operand")
+       (extend_types:SI (match_operand:small_int_modes 1 "memory_operand")))
+   (set (match_dup 0)
+       (extend_types:SI (match_operand:small_int_modes 2 "register_operand")))]
+  "REGNO (operands[0]) == REGNO (operands[2])"
+  [(set (match_dup 0) (extend_types:SI (match_dup 1)))]
+)
+
 (define_insn "comparesi3_<extend_types:code><small_int_modes:mode>"
   [(set (reg:CC CC_REG)
        (compare:CC (match_operand:SI                               0 "register_operand" "=r")