1 files changed, 29 insertions, 0 deletions
diff --git a/test/Transforms/IndVarSimplify/lftr-udiv-tripcount.ll b/test/Transforms/IndVarSimplify/lftr-udiv-tripcount.ll
new file mode 100644
index 0000000..8a1bb07
--- /dev/null
+++ b/test/Transforms/IndVarSimplify/lftr-udiv-tripcount.ll
@@ -0,0 +1,29 @@
+; RUN: opt < %s -indvars -S | FileCheck %s
+
+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-S128"
+
+; It is okay to do LFTR on this loop even though the trip count is a
+; division because in this case the division can be optimized to a
+; shift.
+
+define void @foo(i8* %a, i8 %n) nounwind uwtable ssp {
+; CHECK-LABEL: @foo(
+ entry:
+  %e = icmp sgt i8 %n, 3
+  br i1 %e, label %loop, label %exit
+
+ loop:
+; CHECK-LABEL: loop:
+  %i = phi i8 [ 0, %entry ], [ %i.inc, %loop ]
+  %i1 = phi i8 [ 0, %entry ], [ %i1.inc, %loop ]
+  %i.inc = add nsw i8 %i, 4
+  %i1.inc = add i8 %i1, 1
+  store volatile i8 0, i8* %a
+  %c = icmp slt i8 %i, %n
+; CHECK-LABEL:  %exitcond = icmp ne i8 %i1.inc
+  br i1 %c, label %loop, label %exit
+
+ exit:
+; CHECK-LABEL: exit:
+  ret void
+}