1 files changed, 70 insertions, 0 deletions
diff --git a/polly/test/Isl/CodeGen/single_loop_zero_iterations.ll b/polly/test/Isl/CodeGen/single_loop_zero_iterations.ll
new file mode 100644
index 00000000000..23354ffab3c
--- /dev/null
+++ b/polly/test/Isl/CodeGen/single_loop_zero_iterations.ll
@@ -0,0 +1,70 @@
+; RUN: opt %loadPolly %defaultOpts -polly-ast -analyze  -S < %s | FileCheck %s
+
+;#define N 20
+;
+;int main () {
+;  int i;
+;  int A[N];
+;
+;  A[0] = 0;
+;
+;  __sync_synchronize();
+;
+;  for (i = 0; i < 0; i++)
+;    A[i] = 1;
+;
+;  __sync_synchronize();
+;
+;  if (A[0] == 0)
+;    return 0;
+;  else
+;    return 1;
+;}
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-unknown-linux-gnu"
+
+define i32 @main() nounwind {
+entry:
+  %A = alloca [20 x i32], align 4                 ; <[20 x i32]*> [#uses=3]
+  %arraydecay = getelementptr inbounds [20 x i32]* %A, i32 0, i32 0 ; <i32*> [#uses=1]
+  %arrayidx = getelementptr inbounds i32* %arraydecay, i64 0 ; <i32*> [#uses=1]
+  store i32 0, i32* %arrayidx
+  fence seq_cst
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.inc, %entry
+  %indvar = phi i64 [ %indvar.next, %for.inc ], [ 0, %entry ] ; <i64> [#uses=2]
+  %arrayidx3 = getelementptr [20 x i32]* %A, i64 0, i64 %indvar ; <i32*> [#uses=1]
+  br i1 false, label %for.body, label %for.end
+
+for.body:                                         ; preds = %for.cond
+  store i32 1, i32* %arrayidx3
+  br label %for.inc
+
+for.inc:                                          ; preds = %for.body
+  %indvar.next = add i64 %indvar, 1               ; <i64> [#uses=1]
+  br label %for.cond
+
+for.end:                                          ; preds = %for.cond
+  fence seq_cst
+  %arraydecay5 = getelementptr inbounds [20 x i32]* %A, i32 0, i32 0 ; <i32*> [#uses=1]
+  %arrayidx6 = getelementptr inbounds i32* %arraydecay5, i64 0 ; <i32*> [#uses=1]
+  %tmp7 = load i32* %arrayidx6                    ; <i32> [#uses=1]
+  %cmp8 = icmp eq i32 %tmp7, 0                    ; <i1> [#uses=1]
+  br i1 %cmp8, label %if.then, label %if.else
+
+if.then:                                          ; preds = %for.end
+  br label %return
+
+if.else:                                          ; preds = %for.end
+  br label %return
+
+return:                                           ; preds = %if.else, %if.then
+  %retval.0 = phi i32 [ 0, %if.then ], [ 1, %if.else ] ; <i32> [#uses=1]
+  ret i32 %retval.0
+}
+
+; CHECK: for region: 'for.cond => for.end.region' in function 'main':
+; CHECK-NEXT: main():
+; CHECK-NEXT:   Stmt_for_body(0);