From 74e59b6c24b6770010a76247c1c44abdf2fe92bf Mon Sep 17 00:00:00 2001
From: Richard Sandiford <rdsandiford@googlemail.com>
Date: Sun, 15 Jun 2014 07:33:04 +0000
Subject: df.h (df_single_def, [...]): New functions.

gcc/
	* df.h (df_single_def, df_single_use): New functions.
	* ira.c (find_moveable_pseudos): Use them.

From-SVN: r211681
---
 gcc/df.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'gcc/df.h')

diff --git a/gcc/df.h b/gcc/df.h
index 9ec8ae1..73c0972 100644
--- a/gcc/df.h
+++ b/gcc/df.h
@@ -1165,6 +1165,25 @@ df_get_artificial_uses (unsigned int bb_index)
   return df_scan_get_bb_info (bb_index)->artificial_uses;
 }
 
+/* If INSN defines exactly one register, return the associated reference,
+   otherwise return null.  */
+
+static inline df_ref
+df_single_def (const df_insn_info *info)
+{
+  df_ref *defs = DF_INSN_INFO_DEFS (info);
+  return defs[0] && !defs[1] ? defs[0] : NULL;
+}
+
+/* If INSN uses exactly one register, return the associated reference,
+   otherwise return null.  */
+
+static inline df_ref
+df_single_use (const df_insn_info *info)
+{
+  df_ref *uses = DF_INSN_INFO_USES (info);
+  return uses[0] && !uses[1] ? uses[0] : NULL;
+}
 
 /* web */
 
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