From 3be4893dcecaec7acc21ea445321e27a03ef99b2 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 2 Mar 2008 17:56:29 +0000
Subject: [PATCH] Evan implemented this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47827 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/README.txt          | 23 -----------------------
 test/CodeGen/PowerPC/rlwimi-commute.ll |  8 ++++++++
 2 files changed, 8 insertions(+), 23 deletions(-)

diff --git a/lib/Target/PowerPC/README.txt b/lib/Target/PowerPC/README.txt
index 2ae4088293a..7bc50e5aa39 100644
--- a/lib/Target/PowerPC/README.txt
+++ b/lib/Target/PowerPC/README.txt
@@ -154,29 +154,6 @@ more than one use.  Itanium will want this too.
 
 ===-------------------------------------------------------------------------===
 
-Compile this:
-
-int %f1(int %a, int %b) {
-        %tmp.1 = and int %a, 15         ; <int> [#uses=1]
-        %tmp.3 = and int %b, 240                ; <int> [#uses=1]
-        %tmp.4 = or int %tmp.3, %tmp.1          ; <int> [#uses=1]
-        ret int %tmp.4
-}
-
-without a copy.  We make this currently:
-
-_f1:
-        rlwinm r2, r4, 0, 24, 27
-        rlwimi r2, r3, 0, 28, 31
-        or r3, r2, r2
-        blr
-
-The two-addr pass or RA needs to learn when it is profitable to commute an
-instruction to avoid a copy AFTER the 2-addr instruction.  The 2-addr pass
-currently only commutes to avoid inserting a copy BEFORE the two addr instr.
-
-===-------------------------------------------------------------------------===
-
 Compile offsets from allocas:
 
 int *%test() {
diff --git a/test/CodeGen/PowerPC/rlwimi-commute.ll b/test/CodeGen/PowerPC/rlwimi-commute.ll
index ed2e7b0c297..f8a42b51420 100644
--- a/test/CodeGen/PowerPC/rlwimi-commute.ll
+++ b/test/CodeGen/PowerPC/rlwimi-commute.ll
@@ -24,3 +24,11 @@ define void @test2(i32* %A, i32* %B, i32* %D, i32* %E) {
 	store i32 %B.upgrd.4, i32* %E
 	ret void
 }
+
+define i32 @test3(i32 %a, i32 %b) {
+	%tmp.1 = and i32 %a, 15		; <i32> [#uses=1]
+	%tmp.3 = and i32 %b, 240		; <i32> [#uses=1]
+	%tmp.4 = or i32 %tmp.3, %tmp.1		; <i32> [#uses=1]
+	ret i32 %tmp.4
+}
+