Add testcase for r154007, when a function has the optsize attribute,

  the loop should be unrolled according the value of OptSizeUnrollThreshold.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154014 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopUnroll/partial-unroll-optsize.ll b/test/Transforms/LoopUnroll/partial-unroll-optsize.ll
new file mode 100644 (file)
index 0000000..3179d55
--- /dev/null
+++ b/test/Transforms/LoopUnroll/partial-unroll-optsize.ll
@@ -0,0 +1,35 @@
+; RUN: opt < %s -S -loop-unroll -unroll-allow-partial | FileCheck %s
+; Loop size = 3, when the function has the optsize attribute, the
+; OptSizeUnrollThreshold, i.e. 50, is used, hence the loop should be unrolled
+; by 16 times because 3 * 16 < 50.
+define void @unroll_opt_for_size() nounwind optsize {
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
+  %inc = add i32 %iv, 1
+  %exitcnd = icmp uge i32 %inc, 1024
+  br i1 %exitcnd, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+; CHECK:      add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: add
+; CHECK-NEXT: icmp