Regression is gone, don't try to find it on clean target.

llvm-svn: 33296

1 files changed, 21 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopStrengthReduce/exit_compare_live_range.ll b/llvm/test/Transforms/LoopStrengthReduce/exit_compare_live_range.ll
new file mode 100644
index 00000000000..79beb0bff74
--- /dev/null
+++ b/llvm/test/Transforms/LoopStrengthReduce/exit_compare_live_range.ll
@@ -0,0 +1,21 @@
+; Make sure that the compare instruction occurs after the increment to avoid
+; having overlapping live ranges that result in copies.  We want the setcc 
+; instruction immediately before the conditional branch.
+;
+; RUN: llvm-upgrade < %s | llvm-as | opt -loop-reduce | llvm-dis | \
+; RUN:    %prcontext 'br i1' 1 | grep icmp
+
+void %foo(float* %D, uint %E) {
+entry:
+	br label %no_exit
+
+no_exit:
+	%indvar = phi uint [ 0, %entry ], [ %indvar.next, %no_exit ]
+	volatile store float 0.0, float* %D
+	%indvar.next = add uint %indvar, 1		; <uint> [#uses=2]
+	%exitcond = seteq uint %indvar.next, %E		; <bool> [#uses=1]
+	br bool %exitcond, label %loopexit, label %no_exit
+
+loopexit:
+	ret void
+}