Look pass copies when determining whether hoisting would end up inserting more copies. rdar://9266679

llvm-svn: 129297

1 files changed, 34 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/2011-04-11-MachineLICMBug.ll b/llvm/test/CodeGen/ARM/2011-04-11-MachineLICMBug.ll
new file mode 100644
index 00000000000..a9dd97182a4
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/2011-04-11-MachineLICMBug.ll
@@ -0,0 +1,34 @@
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 | FileCheck %s
+
+; Overly aggressive LICM simply adds copies of constants
+; rdar://9266679
+
+define zeroext i1 @t(i32* nocapture %A, i32 %size, i32 %value) nounwind readonly ssp {
+; CHECK: t:
+entry:
+  br label %for.cond
+
+for.cond:
+  %0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
+  %cmp = icmp ult i32 %0, %size
+  br i1 %cmp, label %for.body, label %return
+
+for.body:
+; CHECK: %for.body
+; CHECK: movs r{{[0-9]+}}, #1
+  %arrayidx = getelementptr i32* %A, i32 %0
+  %tmp4 = load i32* %arrayidx, align 4
+  %cmp6 = icmp eq i32 %tmp4, %value
+  br i1 %cmp6, label %return, label %for.inc
+
+; CHECK: %for.cond
+; CHECK: movs r{{[0-9]+}}, #0
+
+for.inc:
+  %inc = add i32 %0, 1
+  br label %for.cond
+
+return:
+  %retval.0 = phi i1 [ true, %for.body ], [ false, %for.cond ]
+  ret i1 %retval.0
+}