[PATCH] [AArch64] Implement getMaximumUnrollFactor()

[zhaoshiz at codeaurora.org]

>
>   This looks fine to me.
>
>   Tim.
>
> http://reviews.llvm.org/D3320
>
>
>

See below for rebased patch.

Thanks,
Zhaoshi

Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by
The Linux Foundation

>From 8faf5715b31c9f19ea0986c08ec4911df1231e15 Mon Sep 17 00:00:00 2001
From: Zhaoshi Zheng <zhaoshiz at codeaurora.org>
Date: Mon, 31 Mar 2014 17:10:57 -0700
Subject: [PATCH 2/3] [AArch64] Implement getMaximumUnrollFactor()

---
 lib/Target/AArch64/AArch64TargetTransformInfo.cpp  |  1 +
 .../LoopVectorize/AArch64/aarch64-unroll.ll        | 42
++++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll

diff --git a/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
b/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
index e2a1647..b2fb41a 100644
--- a/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -92,6 +92,7 @@ public:
     return 64;
   }

+  unsigned getMaximumUnrollFactor() const override { return 2; }
   /// @}
 };

diff --git a/test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll
b/test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll
new file mode 100644
index 0000000..9962c3d
--- /dev/null
+++ b/test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll
@@ -0,0 +1,42 @@
+; RUN: opt < %s -loop-vectorize -mtriple=aarch64-none-linux-gnu
-mattr=+neon -S | FileCheck %s
+target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
+
+; Function Attrs: nounwind
+define i32* @array_add(i32* noalias nocapture readonly %a, i32* noalias
nocapture readonly %b, i32* %c, i32 %size) {
+;CHECK-LABEL: array_add
+;CHECK: load <4 x i32>
+;CHECK: load <4 x i32>
+;CHECK: load <4 x i32>
+;CHECK: load <4 x i32>
+;CHECK: add nsw <4 x i32>
+;CHECK: add nsw <4 x i32>
+;CHECK: store <4 x i32>
+;CHECK: store <4 x i32>
+;CHECK: ret
+entry:
+  %cmp10 = icmp sgt i32 %size, 0
+  br i1 %cmp10, label %for.body.preheader, label %for.end
+
+for.body.preheader:                               ; preds = %entry
+  br label %for.body
+
+for.body:                                         ; preds =
%for.body.preheader, %for.body
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0,
%for.body.preheader ]
+  %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
+  %0 = load i32* %arrayidx, align 4
+  %arrayidx2 = getelementptr inbounds i32* %b, i64 %indvars.iv
+  %1 = load i32* %arrayidx2, align 4
+  %add = add nsw i32 %1, %0
+  %arrayidx4 = getelementptr inbounds i32* %c, i64 %indvars.iv
+  store i32 %add, i32* %arrayidx4, align 4
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, %size
+  br i1 %exitcond, label %for.end.loopexit, label %for.body
+
+for.end.loopexit:                                 ; preds = %for.body
+  br label %for.end
+
+for.end:                                          ; preds =
%for.end.loopexit, %entry
+  ret i32* %c
+}
-- 
1.8.2.1
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