[IndVars] Have getInsertPointForUses preserve LCSSA

[oota-llvm.git] / test / Transforms / IndVarSimplify / pr25578.ll

diff --git a/test/Transforms/IndVarSimplify/pr25578.ll b/test/Transforms/IndVarSimplify/pr25578.ll
new file mode 100644 (file)
index 0000000..bc648b5
--- /dev/null
+++ b/test/Transforms/IndVarSimplify/pr25578.ll
@@ -0,0 +1,45 @@
+; RUN: opt < %s -indvars -S | FileCheck %s
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+
+; CHECK-LABEL: @foo
+define void @foo() {
+entry:
+  br label %L1_header
+
+L1_header:
+  br label %L2_header
+
+; CHECK: L2_header:
+; CHECK: %[[INDVAR:.*]] = phi i64
+; CHECK: %[[TRUNC:.*]] = trunc i64 %[[INDVAR]] to i32
+L2_header:
+  %i = phi i32 [ 0, %L1_header ], [ %i_next, %L2_latch ]
+  %i_prom = sext i32 %i to i64
+  br label %L3_header
+
+L3_header:
+  br i1 undef, label %L3_latch, label %L2_exiting_1
+
+L3_latch:
+  br i1 undef, label %L3_header, label %L2_exiting_2
+
+L2_exiting_1:
+  br i1 undef, label %L2_latch, label %L1_latch
+
+L2_exiting_2:
+  br i1 undef, label %L2_latch, label %L1_latch
+
+L2_latch:
+  %i_next = add nsw i32 %i, 1
+  br label %L2_header
+
+L1_latch:
+; CHECK: L1_latch:
+; CHECK: %i_lcssa = phi i32 [ %[[TRUNC]], %L2_exiting_1 ], [ %[[TRUNC]], %L2_exiting_2 ]
+
+  %i_lcssa = phi i32 [ %i, %L2_exiting_1 ], [ %i, %L2_exiting_2 ]
+  br i1 undef, label %exit, label %L1_header
+
+exit:
+  ret void
+}