From: Jim Wilson <wilson@gcc.gnu.org>
Date: Wed, 26 Apr 1995 18:06:52 +0000 (-0700)
Subject: (truncdiqi2+[456]): Add patterns to simplify ZERO_EXTEND
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=99f762bff753e425603fb24473155a1c63582b95;p=gcc.git

(truncdiqi2+[456]): Add patterns to simplify ZERO_EXTEND
of a TRUNCATE.

From-SVN: r9478
---

diff --git a/gcc/config/mips/mips.md b/gcc/config/mips/mips.md
index 9717b0748ed..775013eec32 100644
--- a/gcc/config/mips/mips.md
+++ b/gcc/config/mips/mips.md
@@ -2113,6 +2113,38 @@ move\\t%0,%z4\\n\\
   [(set_attr "type"	"darith")
    (set_attr "mode"	"SI")
    (set_attr "length"	"2")])
+
+;; Combiner patterns to optimize truncate/zero_extend combinations.
+
+(define_insn ""
+  [(set (match_operand:SI 0 "register_operand" "=d")
+	(zero_extend:SI (truncate:HI
+			 (match_operand:DI 1 "register_operand" "d"))))]
+  "TARGET_64BIT"
+  "andi\\t%0,%1,0xffff"
+  [(set_attr "type"	"darith")
+   (set_attr "mode"	"SI")
+   (set_attr "length"	"1")])
+
+(define_insn ""
+  [(set (match_operand:SI 0 "register_operand" "=d")
+	(zero_extend:SI (truncate:QI
+			 (match_operand:DI 1 "register_operand" "d"))))]
+  "TARGET_64BIT"
+  "andi\\t%0,%1,0xff"
+  [(set_attr "type"	"darith")
+   (set_attr "mode"	"SI")
+   (set_attr "length"	"1")])
+
+(define_insn ""
+  [(set (match_operand:HI 0 "register_operand" "=d")
+	(zero_extend:HI (truncate:QI
+			 (match_operand:DI 1 "register_operand" "d"))))]
+  "TARGET_64BIT"
+  "andi\\t%0,%1,0xff"
+  [(set_attr "type"	"darith")
+   (set_attr "mode"	"HI")
+   (set_attr "length"	"1")])
 
 ;;
 ;;  ....................