From ef402c6521e1fd6fee2ad6a1d9c2f972f57c5ede Mon Sep 17 00:00:00 2001
From: Oleg Endo <olegendo@gcc.gnu.org>
Date: Tue, 8 May 2012 21:36:30 +0000
Subject: [PATCH] re PR target/51244 ([SH] Inefficient conditional branch and
code around T bit)
PR target/51244
* config/sh/sh.md (*branch_true, *branch_false): New insns.
From-SVN: r187298
---
gcc/ChangeLog | 5 +++++
gcc/config/sh/sh.md | 48 ++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 52 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a3f5a8fd9d6c..aa5537aea02d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-05-08 Oleg Endo <olegendo@gcc.gnu.org>
+
+ PR target/51244
+ * config/sh/sh.md (*branch_true, *branch_false): New insns.
+
2012-05-08 Teresa Johnson <tejohnson@google.com>
* gcov-io.h (__gcov_reset, __gcov_dump): Declare.
diff --git a/gcc/config/sh/sh.md b/gcc/config/sh/sh.md
index 914d5bf8b924..7167b920641a 100644
--- a/gcc/config/sh/sh.md
+++ b/gcc/config/sh/sh.md
@@ -7097,6 +7097,29 @@ label:
}
[(set_attr "type" "cbranch")])
+;; The *branch_true patterns help combine when trying to invert conditions.
+(define_insn "*branch_true"
+ [(set (pc) (if_then_else (ne (zero_extend:SI (subreg:QI (reg:SI T_REG) 0))
+ (const_int 0))
+ (label_ref (match_operand 0 "" ""))
+ (pc)))]
+ "TARGET_SH1 && TARGET_LITTLE_ENDIAN"
+{
+ return output_branch (1, insn, operands);
+}
+ [(set_attr "type" "cbranch")])
+
+(define_insn "*branch_true"
+ [(set (pc) (if_then_else (ne (zero_extend:SI (subreg:QI (reg:SI T_REG) 3))
+ (const_int 0))
+ (label_ref (match_operand 0 "" ""))
+ (pc)))]
+ "TARGET_SH1 && ! TARGET_LITTLE_ENDIAN"
+{
+ return output_branch (1, insn, operands);
+}
+ [(set_attr "type" "cbranch")])
+
(define_insn "branch_false"
[(set (pc) (if_then_else (eq (reg:SI T_REG) (const_int 0))
(label_ref (match_operand 0 "" ""))
@@ -7107,6 +7130,29 @@ label:
}
[(set_attr "type" "cbranch")])
+;; The *branch_false patterns help combine when trying to invert conditions.
+(define_insn "*branch_false"
+ [(set (pc) (if_then_else (eq (zero_extend:SI (subreg:QI (reg:SI T_REG) 0))
+ (const_int 0))
+ (label_ref (match_operand 0 "" ""))
+ (pc)))]
+ "TARGET_SH1 && TARGET_LITTLE_ENDIAN"
+{
+ return output_branch (0, insn, operands);
+}
+ [(set_attr "type" "cbranch")])
+
+(define_insn "*branch_false"
+ [(set (pc) (if_then_else (eq (zero_extend:SI (subreg:QI (reg:SI T_REG) 3))
+ (const_int 0))
+ (label_ref (match_operand 0 "" ""))
+ (pc)))]
+ "TARGET_SH1 && ! TARGET_LITTLE_ENDIAN"
+{
+ return output_branch (0, insn, operands);
+}
+ [(set_attr "type" "cbranch")])
+
;; Patterns to prevent reorg from re-combining a condbranch with a branch
;; which destination is too far away.
;; The const_int_operand is distinct for each branch target; it avoids
@@ -9721,7 +9767,7 @@ label:
""
[(const_int 0)])
-;; The *movtt patterns improve code at -O1.
+;; The *movtt patterns eliminate redundant T bit to T bit moves / tests.
(define_insn_and_split "*movtt"
[(set (reg:SI T_REG)
(eq:SI (zero_extend:SI (subreg:QI (reg:SI T_REG) 3))
--
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