[PATCH] D17464: [LoopDataPrefetch] Make it testable with opt

[Adam Nemet via llvm-commits]

anemet created this revision.
anemet added a reviewer: hfinkel.
anemet added a subscriber: llvm-commits.

Since this is an IR pass it's nice to be able to write tests without
llc.  This is the counterpart of the llc test under
CodeGen/PowerPC/loop-data-prefetch.ll.

http://reviews.llvm.org/D17464

Files:
  include/llvm/InitializePasses.h
  lib/Transforms/Scalar/Scalar.cpp
  test/Transforms/LoopDataPrefetch/basic.ll

Index: test/Transforms/LoopDataPrefetch/basic.ll
===================================================================
--- /dev/null
+++ test/Transforms/LoopDataPrefetch/basic.ll
@@ -0,0 +1,26 @@
+; RUN: opt -mcpu=a2 -loop-data-prefetch -S < %s | FileCheck %s
+target datalayout = "E-m:e-i64:64-n32:64"
+target triple = "powerpc64-bgq-linux"
+
+; Function Attrs: nounwind
+define void @foo(double* nocapture %a, double* nocapture readonly %b) {
+entry:
+  br label %for.body
+
+; CHECK: for.body:
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %arrayidx = getelementptr inbounds double, double* %b, i64 %indvars.iv
+; CHECK: call void @llvm.prefetch
+  %0 = load double, double* %arrayidx, align 8
+  %add = fadd double %0, 1.000000e+00
+  %arrayidx2 = getelementptr inbounds double, double* %a, i64 %indvars.iv
+  store double %add, double* %arrayidx2, align 8
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond = icmp eq i64 %indvars.iv.next, 1600
+  br i1 %exitcond, label %for.end, label %for.body
+
+; CHECK: for.end:
+for.end:                                          ; preds = %for.body
+  ret void
+}
Index: lib/Transforms/Scalar/Scalar.cpp
===================================================================
--- lib/Transforms/Scalar/Scalar.cpp
+++ lib/Transforms/Scalar/Scalar.cpp
@@ -47,6 +47,7 @@
   initializeIndVarSimplifyPass(Registry);
   initializeJumpThreadingPass(Registry);
   initializeLICMPass(Registry);
+  initializeLoopDataPrefetchPass(Registry);
   initializeLoopDeletionPass(Registry);
   initializeLoopAccessAnalysisPass(Registry);
   initializeLoopInstSimplifyPass(Registry);
Index: include/llvm/InitializePasses.h
===================================================================
--- include/llvm/InitializePasses.h
+++ include/llvm/InitializePasses.h
@@ -163,6 +163,7 @@
 void initializeLiveVariablesPass(PassRegistry&);
 void initializeLoaderPassPass(PassRegistry&);
 void initializeLocalStackSlotPassPass(PassRegistry&);
+void initializeLoopDataPrefetchPass(PassRegistry&);
 void initializeLoopDeletionPass(PassRegistry&);
 void initializeLoopExtractorPass(PassRegistry&);
 void initializeLoopInfoWrapperPassPass(PassRegistry&);


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