[LoopDataPrefetch] Make it testable with opt

Summary:
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.

Reviewers: hfinkel

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D17464

llvm-svn: 261578

1 files changed, 25 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopDataPrefetch/PowerPC/basic.ll b/llvm/test/Transforms/LoopDataPrefetch/PowerPC/basic.ll
new file mode 100644
index 00000000000..772ecae74b4
--- /dev/null
+++ b/llvm/test/Transforms/LoopDataPrefetch/PowerPC/basic.ll
@@ -0,0 +1,25 @@
+; 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"
+
+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
+}