From ada219b13a2debc94cb252feb0dd987ef9290126 Mon Sep 17 00:00:00 2001
From: Roman Lebedev <lebedev.ri@gmail.com>
Date: Mon, 30 Aug 2021 12:00:08 +0300
Subject: [PATCH] [NFC][IndVars] Add test that caused D108043 to be reverted

We currently don't simplify anything here, but we can.
---
 llvm/test/Transforms/IndVarSimplify/D108043.ll | 68 ++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 llvm/test/Transforms/IndVarSimplify/D108043.ll

diff --git a/llvm/test/Transforms/IndVarSimplify/D108043.ll b/llvm/test/Transforms/IndVarSimplify/D108043.ll
new file mode 100644
index 0000000..d12506b
--- /dev/null
+++ b/llvm/test/Transforms/IndVarSimplify/D108043.ll
@@ -0,0 +1,68 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -indvars -S %s | FileCheck %s
+
+@g_2168 = external global [4 x [6 x i32]], align 16
+@g_1150 = external global i32*, align 8
+
+define internal fastcc void @func_2() unnamed_addr {
+; CHECK-LABEL: @func_2(
+; CHECK-NEXT:  lbl_2898.preheader:
+; CHECK-NEXT:    br label [[LBL_2898:%.*]]
+; CHECK:       lbl_2898.loopexit:
+; CHECK-NEXT:    [[DOTLCSSA:%.*]] = phi i32* [ [[TMP0:%.*]], [[FOR_COND884:%.*]] ]
+; CHECK-NEXT:    store i32* [[DOTLCSSA]], i32** @g_1150, align 8
+; CHECK-NEXT:    br label [[LBL_2898]]
+; CHECK:       lbl_2898:
+; CHECK-NEXT:    [[G_1150_PROMOTED:%.*]] = load i32*, i32** @g_1150, align 8
+; CHECK-NEXT:    br label [[FOR_COND884]]
+; CHECK:       for.cond884:
+; CHECK-NEXT:    [[TMP0]] = phi i32* [ getelementptr inbounds ([4 x [6 x i32]], [4 x [6 x i32]]* @g_2168, i64 0, i64 3, i64 1), [[FOR_END987:%.*]] ], [ [[G_1150_PROMOTED]], [[LBL_2898]] ]
+; CHECK-NEXT:    [[STOREMERGE9:%.*]] = phi i16 [ [[ADD990:%.*]], [[FOR_END987]] ], [ 0, [[LBL_2898]] ]
+; CHECK-NEXT:    [[CMP886:%.*]] = icmp ult i16 [[STOREMERGE9]], 3
+; CHECK-NEXT:    br i1 [[CMP886]], label [[FOR_BODY888:%.*]], label [[LBL_2898_LOOPEXIT:%.*]]
+; CHECK:       for.body888:
+; CHECK-NEXT:    br label [[FOR_COND918:%.*]]
+; CHECK:       for.cond918:
+; CHECK-NEXT:    br label [[FOR_END926:%.*]]
+; CHECK:       for.end926:
+; CHECK-NEXT:    br label [[FOR_COND936:%.*]]
+; CHECK:       for.cond936:
+; CHECK-NEXT:    br label [[FOR_END987]]
+; CHECK:       for.end987:
+; CHECK-NEXT:    [[ADD990]] = add nuw nsw i16 [[STOREMERGE9]], 1
+; CHECK-NEXT:    br label [[FOR_COND884]]
+;
+lbl_2898.preheader:
+  br label %lbl_2898
+
+lbl_2898.loopexit:
+  %.lcssa = phi i32* [ %0, %for.cond884 ]
+  store i32* %.lcssa, i32** @g_1150, align 8
+  br label %lbl_2898
+
+lbl_2898:
+  %g_1150.promoted = load i32*, i32** @g_1150, align 8
+  br label %for.cond884
+
+for.cond884:
+  %0 = phi i32* [ getelementptr inbounds ([4 x [6 x i32]], [4 x [6 x i32]]* @g_2168, i64 0, i64 3, i64 1), %for.end987 ], [ %g_1150.promoted, %lbl_2898 ]
+  %storemerge9 = phi i16 [ %add990, %for.end987 ], [ 0, %lbl_2898 ]
+  %cmp886 = icmp slt i16 %storemerge9, 3
+  br i1 %cmp886, label %for.body888, label %lbl_2898.loopexit
+
+for.body888:
+  br label %for.cond918
+
+for.cond918:
+  br label %for.end926
+
+for.end926:
+  br label %for.cond936
+
+for.cond936:
+  br label %for.end987
+
+for.end987:
+  %add990 = add i16 %storemerge9, 1
+  br label %for.cond884
+}
-- 
2.7.4