[llvm] [Hexagon] Add support for addrspacecast lowering (PR #119195)

[Santanu Das via llvm-commits]

https://github.com/quic-santdas created https://github.com/llvm/llvm-project/pull/119195

Change-Id: I04898ffa9d75a8177b9aa13e0836988e03eb26c9

>From 881271f4683dcbc049e764c4fbafc85f8c0b71dd Mon Sep 17 00:00:00 2001
From: quic-santdas <quic_santdas at quicinc.com>
Date: Wed, 4 Dec 2024 04:14:57 -0800
Subject: [PATCH] [Hexagon] Add support for addrspacecast lowering

Change-Id: I04898ffa9d75a8177b9aa13e0836988e03eb26c9
---
 llvm/lib/Target/Hexagon/HexagonTargetMachine.h   |  4 ++++
 llvm/test/CodeGen/Hexagon/addrspacecast-crash.ll | 12 ++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 llvm/test/CodeGen/Hexagon/addrspacecast-crash.ll

diff --git a/llvm/lib/Target/Hexagon/HexagonTargetMachine.h b/llvm/lib/Target/Hexagon/HexagonTargetMachine.h
index 6e9a78b7665042..84edbe6fd870b3 100644
--- a/llvm/lib/Target/Hexagon/HexagonTargetMachine.h
+++ b/llvm/lib/Target/Hexagon/HexagonTargetMachine.h
@@ -46,6 +46,10 @@ class HexagonTargetMachine : public LLVMTargetMachine {
   MachineFunctionInfo *
   createMachineFunctionInfo(BumpPtrAllocator &Allocator, const Function &F,
                             const TargetSubtargetInfo *STI) const override;
+
+  bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override {
+    return true;
+  }
 };
 
 } // end namespace llvm
diff --git a/llvm/test/CodeGen/Hexagon/addrspacecast-crash.ll b/llvm/test/CodeGen/Hexagon/addrspacecast-crash.ll
new file mode 100644
index 00000000000000..ce197bdeea1f38
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/addrspacecast-crash.ll
@@ -0,0 +1,12 @@
+; Tests if addrspacecast is handled in Hexagon backend
+
+; REQUIRES: asserts
+
+; RUN: llc -march=hexagon %s -o /dev/null
+
+define double @f(ptr %G, ptr %x) {
+BB:
+  %Castaddrspacecast = addrspacecast ptr %x to ptr addrspace(1)
+  store ptr addrspace(1) %Castaddrspacecast, ptr %G, align 8
+  ret double 0.000000e+00
+}