From: sayle <sayle@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 12 Mar 2004 17:21:32 +0000 (+0000)
Subject: 	* config/i386/i386.c (ix86_split_ashrdi): Optimize shift by 63.
X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=commitdiff_plain;h=c1fc26c116ca2268df4f3d9912030935e88e308d

	* config/i386/i386.c (ix86_split_ashrdi): Optimize shift by 63.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@79397 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e2821e3deda..ca4525cda39 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2004-03-12  Roger Sayle  <roger@eyesopen.com>
+
+	* config/i386/i386.c (ix86_split_ashrdi): Optimize shift by 63.
+
 2004-03-12  Matt Austern  <austern@apple.com>
 
 	* target.h (struct gcc_target): New target hook, unwind_label.
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 58e26333a5c..dadd18def82 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -10873,7 +10873,14 @@ ix86_split_ashrdi (rtx *operands, rtx scratch)
       split_di (operands, 2, low, high);
       count = INTVAL (operands[2]) & 63;
 
-      if (count >= 32)
+      if (count == 63)
+	{
+	  emit_move_insn (high[0], high[1]);
+	  emit_insn (gen_ashrsi3 (high[0], high[0], GEN_INT (31)));
+	  emit_move_insn (low[0], high[0]);
+
+	}
+      else if (count >= 32)
 	{
 	  emit_move_insn (low[0], high[1]);