[llvm] r206563 - This commit allows vectorized loops to be unrolled by a factor of 2 for AArch64.
Jiangning Liu
jiangning.liu at arm.com
Fri Apr 18 00:57:55 PDT 2014
Author: jiangning
Date: Fri Apr 18 02:57:54 2014
New Revision: 206563
URL: http://llvm.org/viewvc/llvm-project?rev=206563&view=rev
Log:
This commit allows vectorized loops to be unrolled by a factor of 2 for AArch64.
A new test case is also added for ARM64.
Patched by Z.Zheng
Added:
llvm/trunk/test/Transforms/LoopVectorize/AArch64/
llvm/trunk/test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll
llvm/trunk/test/Transforms/LoopVectorize/ARM64/arm64-unroll.ll
Modified:
llvm/trunk/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
Modified: llvm/trunk/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64TargetTransformInfo.cpp?rev=206563&r1=206562&r2=206563&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64TargetTransformInfo.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64TargetTransformInfo.cpp Fri Apr 18 02:57:54 2014
@@ -92,6 +92,7 @@ public:
return 64;
}
+ unsigned getMaximumUnrollFactor() const override { return 2; }
/// @}
};
Added: llvm/trunk/test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll?rev=206563&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll (added)
+++ llvm/trunk/test/Transforms/LoopVectorize/AArch64/aarch64-unroll.ll Fri Apr 18 02:57:54 2014
@@ -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
+}
Added: llvm/trunk/test/Transforms/LoopVectorize/ARM64/arm64-unroll.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopVectorize/ARM64/arm64-unroll.ll?rev=206563&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/LoopVectorize/ARM64/arm64-unroll.ll (added)
+++ llvm/trunk/test/Transforms/LoopVectorize/ARM64/arm64-unroll.ll Fri Apr 18 02:57:54 2014
@@ -0,0 +1,42 @@
+; RUN: opt < %s -loop-vectorize -mtriple=arm64-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
+}
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