Revert "Temporarily Revert "Add basic loop fusion pass.""

The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552

1 files changed, 36 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopUnroll/runtime-li.ll b/llvm/test/Transforms/LoopUnroll/runtime-li.ll
new file mode 100644
index 00000000000..5494c8e9da7
--- /dev/null
+++ b/llvm/test/Transforms/LoopUnroll/runtime-li.ll
@@ -0,0 +1,36 @@
+; RUN: opt -S -loop-unroll -unroll-runtime -unroll-count=2 -verify-loop-info -pass-remarks=loop-unroll < %s 2>&1 | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; Verify that runtime-unrolling a top-level loop that has nested loops does not
+; make the unroller produce invalid loop-info.
+; CHECK: remark: {{.*}}: unrolled loop by a factor of 2 with run-time trip count
+; CHECK: @widget
+; CHECK: ret void
+define void @widget(double* %arg, double* %arg1, double* %p, i64* %q1, i64* %q2) local_unnamed_addr {
+entry:
+  br label %header.outer
+
+header.outer:                                     ; preds = %latch.outer, %entry
+  %tmp = phi double* [ %tmp8, %latch.outer ], [ %arg, %entry ]
+  br label %header.inner
+
+header.inner:                                     ; preds = %latch.inner, %header.outer
+  br i1 undef, label %latch.inner, label %latch.outer
+
+latch.inner:                                      ; preds = %header.inner
+  %tmp5 = load i64, i64* %q1, align 8
+  store i64 %tmp5, i64* %q2, align 8
+  %tmp6 = icmp eq double* %p, %arg
+  br label %header.inner
+
+latch.outer:                                      ; preds = %header.inner
+  store double 0.0, double* %p, align 8
+  %tmp8 = getelementptr inbounds double, double* %tmp, i64 1
+  %tmp9 = icmp eq double* %tmp8, %arg1
+  br i1 %tmp9, label %exit, label %header.outer
+
+exit:                                             ; preds = %latch.outer
+  ret void
+}