Disable loop re-rotation for -Oz (patch by Andrey Turetsky)

After changes in rL231820 loop re-rotation is performed even in -Oz mode. Since loop rotation is disabled for -Oz, it seems loop re-rotation should be disabled too.
Differential Revision: http://reviews.llvm.org/D10961

llvm-svn: 241897

1 files changed, 30 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopRotate/oz-disable.ll b/llvm/test/Transforms/LoopRotate/oz-disable.ll
new file mode 100644
index 00000000000..7a6a9bf33a1
--- /dev/null
+++ b/llvm/test/Transforms/LoopRotate/oz-disable.ll
@@ -0,0 +1,30 @@
+; REQUIRES: asserts
+; RUN: opt < %s -S -Os -debug -debug-only=loop-rotate 2>&1 | FileCheck %s -check-prefix=OS
+; RUN: opt < %s -S -Oz -debug -debug-only=loop-rotate 2>&1 | FileCheck %s -check-prefix=OZ
+
+; Loop should be rotated for -Os but not for -Oz.
+; OS: rotating Loop at depth 1
+; OZ-NOT: rotating Loop at depth 1
+
+@e = global i32 10
+
+declare void @use(i32)
+
+define void @test() {
+entry:
+  %end = load i32, i32* @e
+  br label %loop
+
+loop:
+  %n.phi = phi i32 [ %n, %loop.fin ], [ 0, %entry ]
+  %cond = icmp eq i32 %n.phi, %end
+  br i1 %cond, label %exit, label %loop.fin
+
+loop.fin:
+  %n = add i32 %n.phi, 1
+  call void @use(i32 %n)
+  br label %loop
+
+exit:
+  ret void
+}