[PBQP] Add a testcase for r220302: Fix coalescing benefits

llvm-svn: 220316

diff --git a/llvm/test/CodeGen/AArch64/PBQP-coalesce-benefit.ll b/llvm/test/CodeGen/AArch64/PBQP-coalesce-benefit.ll
new file mode 100644 (file)
index 0000000..45ac5e6
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/PBQP-coalesce-benefit.ll
@@ -0,0 +1,14 @@
+; RUN: llc < %s -verify-machineinstrs -mtriple=aarch64-none-linux-gnu -mcpu=cortex-a57 -mattr=+neon -fp-contract=fast -regalloc=pbqp -pbqp-coalescing | FileCheck %s
+
+; CHECK-LABEL: test:
+define i32 @test(i32 %acc, i32* nocapture readonly %c) {
+entry:
+  %0 = load i32* %c, align 4
+; CHECK-NOT: mov        w{{[0-9]*}}, w0
+  %add = add nsw i32 %0, %acc
+  %arrayidx1 = getelementptr inbounds i32* %c, i64 1
+  %1 = load i32* %arrayidx1, align 4
+  %add2 = add nsw i32 %add, %1
+  ret i32 %add2
+}
+