From 4634338655449a6e76b6a948c91fbe5bc736d24b Mon Sep 17 00:00:00 2001
From: Arnold Schwaighofer <aschwaighofer@apple.com>
Date: Fri, 15 Nov 2013 23:09:33 +0000
Subject: LoopVectorizer: Use abi alignment for accesses with no alignment

When we vectorize a scalar access with no alignment specified, we have to set
the target's abi alignment of the scalar access on the vectorized access.
Using the same alignment of zero would be wrong because most targets will have a
bigger abi alignment for vector types.

This probably fixes PR17878.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194876 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/LoopVectorize/align.ll | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 test/Transforms/LoopVectorize/align.ll

(limited to 'test/Transforms')

diff --git a/test/Transforms/LoopVectorize/align.ll b/test/Transforms/LoopVectorize/align.ll
new file mode 100644
index 0000000..84b0361
--- /dev/null
+++ b/test/Transforms/LoopVectorize/align.ll
@@ -0,0 +1,33 @@
+; RUN: opt < %s  -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -S | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.8.0"
+
+; Make sure we output the abi alignment if no alignment is specified.
+
+;CHECK-LABEL: @align
+;CHECK: load <4 x i32>* {{.*}} align  4
+;CHECK: load <4 x i32>* {{.*}} align  4
+;CHECK: store <4 x i32> {{.*}} align  4
+
+define void @align(i32* %a, i32* %b, i32* %c) nounwind uwtable ssp {
+  br label %1
+
+; <label>:1                                       ; preds = %1, %0
+  %indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %1 ]
+  %2 = getelementptr inbounds i32* %b, i64 %indvars.iv
+  %3 = load i32* %2
+  %4 = getelementptr inbounds i32* %c, i64 %indvars.iv
+  %5 = load i32* %4
+  %6 = add nsw i32 %5, %3
+  %7 = getelementptr inbounds i32* %a, i64 %indvars.iv
+  store i32 %6, i32* %7
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, 128 
+  br i1 %exitcond, label %8, label %1
+
+; <label>:8                                       ; preds = %1
+  ret void
+}
+
-- 
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