From 25ce6341729dab20601787a317ea7c5166c31f15 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Fri, 14 Aug 2020 15:59:53 +0100
Subject: [PATCH] [DemandedBits] Add addition test case from D72423

---
 llvm/test/Analysis/DemandedBits/add.ll | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 llvm/test/Analysis/DemandedBits/add.ll

diff --git a/llvm/test/Analysis/DemandedBits/add.ll b/llvm/test/Analysis/DemandedBits/add.ll
new file mode 100644
index 000000000000..102d667745a2
--- /dev/null
+++ b/llvm/test/Analysis/DemandedBits/add.ll
@@ -0,0 +1,22 @@
+; RUN: opt -S -demanded-bits -analyze < %s | FileCheck %s
+; RUN: opt -S -disable-output -passes="print<demanded-bits>" < %s 2>&1 | FileCheck %s
+
+; CHECK-DAG: DemandedBits: 0x1f for   %5 = or i32 %2, %3
+; CHECK-DAG: DemandedBits: 0xffffffff for   %8 = and i32 %7, 16
+; CHECK-DAG: DemandedBits: 0x1f for   %4 = and i32 %d, 4
+; CHECK-DAG: DemandedBits: 0x1f for   %1 = and i32 %a, 9
+; CHECK-DAG: DemandedBits: 0x1f for   %3 = and i32 %c, 13
+; CHECK-DAG: DemandedBits: 0x10 for   %7 = add i32 %1, %6
+; CHECK-DAG: DemandedBits: 0x1f for   %6 = or i32 %4, %5
+; CHECK-DAG: DemandedBits: 0x1f for   %2 = and i32 %b, 9
+define i32 @test_add(i32 %a, i32 %b, i32 %c, i32 %d) {
+  %1 = and i32 %a, 9
+  %2 = and i32 %b, 9
+  %3 = and i32 %c, 13
+  %4 = and i32 %d, 4 ; no bit of %d alive, %4 simplifies to zero
+  %5 = or i32 %2, %3
+  %6 = or i32 %4, %5
+  %7 = add i32 %1, %6
+  %8 = and i32 %7, 16
+  ret i32 %8
+}
\ No newline at end of file