From b482829abb6d3e1fe80eec0ad92e0514e41cfd2a Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Sat, 3 Jul 2010 08:43:32 +0000
Subject: [PATCH] Minor amendment to switch-lowering improvement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107569 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/README.txt | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 8f785393fd0..90afe3640ce 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -1918,9 +1918,17 @@ a:
 .LBB0_2:
 	ret
 .LBB0_3:
-	xorb	%al, %al
-	jmp	foo@PLT  # TAILCALL
+	jmp	foo  # TAILCALL
 
 The movl+movl+btq+jb could be simplified to a cmpl+jne.
 
+Or, if we wanted to be really clever, we could simplify the whole thing to
+something like the following, which eliminates a branch:
+	xorl    $1, %edi
+	cmpl	$4, %edi
+	ja	.LBB0_2
+	ret
+.LBB0_2:
+	jmp	foo  # TAILCALL
+
 //===---------------------------------------------------------------------===//
-- 
2.34.1