Revert "Temporarily Revert "Add basic loop fusion pass.""
The reversion apparently deleted the test/Transforms directory.
Will be re-reverting again.
llvm-svn: 358552
diff --git a/llvm/test/Transforms/LoopUnroll/runtime-loop5.ll b/llvm/test/Transforms/LoopUnroll/runtime-loop5.ll
new file mode 100644
index 0000000..ebb9a85
--- /dev/null
+++ b/llvm/test/Transforms/LoopUnroll/runtime-loop5.ll
@@ -0,0 +1,49 @@
+; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-count=16 | FileCheck --check-prefix=UNROLL-16 %s
+; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-count=4 | FileCheck --check-prefix=UNROLL-4 %s
+
+; RUN: opt < %s -S -passes='require<opt-remark-emit>,unroll' -unroll-runtime=true -unroll-count=16 | FileCheck --check-prefix=UNROLL-16 %s
+; RUN: opt < %s -S -passes='require<opt-remark-emit>,unroll' -unroll-runtime=true -unroll-count=4 | FileCheck --check-prefix=UNROLL-4 %s
+
+; Given that the trip-count of this loop is a 3-bit value, we cannot
+; safely unroll it with a count of anything more than 8.
+
+define i3 @test(i3* %a, i3 %n) {
+; UNROLL-16-LABEL: @test(
+; UNROLL-4-LABEL: @test(
+entry:
+ %cmp1 = icmp eq i3 %n, 0
+ br i1 %cmp1, label %for.end, label %for.body
+
+for.body: ; preds = %for.body, %entry
+; UNROLL-16-LABEL: for.body:
+; UNROLL-4-LABEL: for.body:
+ %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
+ %sum.02 = phi i3 [ %add, %for.body ], [ 0, %entry ]
+ %arrayidx = getelementptr inbounds i3, i3* %a, i64 %indvars.iv
+
+; UNROLL-16-LABEL: for.body
+; UNROLL-16-LABEL: getelementptr
+; UNROLL-16-LABEL-NOT: getelementptr
+
+; UNROLL-4-LABEL: getelementptr
+; UNROLL-4-LABEL: getelementptr
+; UNROLL-4-LABEL: getelementptr
+; UNROLL-4-LABEL: getelementptr
+
+ %0 = load i3, i3* %arrayidx
+ %add = add nsw i3 %0, %sum.02
+ %indvars.iv.next = add i64 %indvars.iv, 1
+ %lftr.wideiv = trunc i64 %indvars.iv.next to i3
+ %exitcond = icmp eq i3 %lftr.wideiv, %n
+ br i1 %exitcond, label %for.end, label %for.body
+
+; UNROLL-16-LABEL: for.end
+; UNROLL-4-LABEL: for.end
+
+; UNROLL-16-NOT: for.body.epil:
+; UNROLL-4: for.body.epil:
+
+for.end: ; preds = %for.body, %entry
+ %sum.0.lcssa = phi i3 [ 0, %entry ], [ %add, %for.body ]
+ ret i3 %sum.0.lcssa
+}