From: Chris Lattner <sabre@nondot.org>
Date: Sat, 24 Mar 2007 06:01:32 +0000 (+0000)
Subject: add a bad case evan though of.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1a77a556cdc7ff75391a474b6aea03250f44b45b;p=oota-llvm.git

add a bad case evan though of.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35296 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 482bc49ad7f..8297bc3a8c8 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -377,3 +377,35 @@ Promote for i32 bswap can use i64 bswap + shr.  Useful on targets with 64-bit
 regs and bswap, like itanium.
 
 //===---------------------------------------------------------------------===//
+
+LSR should know what GPR types a target has.  This code:
+
+volatile short X, Y; // globals
+
+void foo(int N) {
+  int i;
+  for (i = 0; i < N; i++) { X = i; Y = i*4; }
+}
+
+produces two identical IV's (after promotion) on PPC/ARM:
+
+LBB1_1: @bb.preheader
+        mov r3, #0
+        mov r2, r3
+        mov r1, r3
+LBB1_2: @bb
+        ldr r12, LCPI1_0
+        ldr r12, [r12]
+        strh r2, [r12]
+        ldr r12, LCPI1_1
+        ldr r12, [r12]
+        strh r3, [r12]
+        add r1, r1, #1    <- [0,+,1]
+        add r3, r3, #4
+        add r2, r2, #1    <- [0,+,1]
+        cmp r1, r0
+        bne LBB1_2      @bb
+
+
+//===---------------------------------------------------------------------===//
+