From 3b364cb9866f7fdadd9b98d4c339ee1ae91505e9 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 15 Oct 2008 16:33:52 +0000
Subject: [PATCH] move PR1941 here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57586 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/README.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 9831efbdf64..93e8c54979d 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -971,3 +971,17 @@ int main() {
 
 //===---------------------------------------------------------------------===//
 
+Instcombine will merge comparisons like (x >= 10) && (x < 20) by producing (x -
+10) u< 10, but only when the comparisons have matching sign.
+
+This could be converted with a similiar technique. (PR1941)
+
+define i1 @test(i8 %x) {
+  %A = icmp uge i8 %x, 5
+  %B = icmp slt i8 %x, 20
+  %C = and i1 %A, %B
+  ret i1 %C
+}
+
+//===---------------------------------------------------------------------===//
+
-- 
2.34.1