[llvm] AMDGPU: Mark ds append/consume intrinsics with align 4 (PR #110533)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/110533

Manual says the low 2 bits of the pointer are ignored.

>From 8660c807a059f92c72e430086dfd59c92f78d5dc Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Mon, 30 Sep 2024 19:46:31 +0400
Subject: [PATCH] AMDGPU: Mark ds append/consume intrinsics with align 4

Manual says the low 2 bits of the pointer are ignored.
---
 llvm/include/llvm/IR/IntrinsicsAMDGPU.td      |  3 ++-
 .../Assembler/amdgcn-intrinsic-attributes.ll  | 21 +++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 llvm/test/Assembler/amdgcn-intrinsic-attributes.ll

diff --git a/llvm/include/llvm/IR/IntrinsicsAMDGPU.td b/llvm/include/llvm/IR/IntrinsicsAMDGPU.td
index a03a92b5a97f78..50179c1ceddb47 100644
--- a/llvm/include/llvm/IR/IntrinsicsAMDGPU.td
+++ b/llvm/include/llvm/IR/IntrinsicsAMDGPU.td
@@ -558,7 +558,8 @@ class AMDGPUDSAppendConsumedIntrinsic : Intrinsic<
   [llvm_anyptr_ty, // LDS or GDS ptr
    llvm_i1_ty], // isVolatile
    [IntrConvergent, IntrWillReturn, IntrArgMemOnly,
-    NoCapture<ArgIndex<0>>, ImmArg<ArgIndex<1>>, IntrNoCallback, IntrNoFree],
+    Align<ArgIndex<0>, 4>, NoCapture<ArgIndex<0>>,
+    ImmArg<ArgIndex<1>>, IntrNoCallback, IntrNoFree],
    "",
    [SDNPMemOperand]
 >;
diff --git a/llvm/test/Assembler/amdgcn-intrinsic-attributes.ll b/llvm/test/Assembler/amdgcn-intrinsic-attributes.ll
new file mode 100644
index 00000000000000..3652f6a4a27e37
--- /dev/null
+++ b/llvm/test/Assembler/amdgcn-intrinsic-attributes.ll
@@ -0,0 +1,21 @@
+; REQUIRES: amdgpu-registered-target
+
+; RUN: llvm-as < %s | llvm-dis | FileCheck %s
+
+; Test assumed alignment parameter
+
+; CHECK: declare i32 @llvm.amdgcn.ds.append.p3(ptr addrspace(3) nocapture align 4, i1 immarg) #0
+
+define i32 @ds_append(ptr addrspace(3) %ptr) {
+  %ret = call i32 @llvm.amdgcn.ds.append.p3(ptr addrspace(3) %ptr, i1 false)
+  ret i32 %ret
+}
+
+; Test assumed alignment parameter
+; CHECK: declare i32 @llvm.amdgcn.ds.consume.p3(ptr addrspace(3) nocapture align 4, i1 immarg) #0
+define i32 @ds_consume(ptr addrspace(3) %ptr) {
+  %ret = call i32 @llvm.amdgcn.ds.consume.p3(ptr addrspace(3) %ptr, i1 false)
+  ret i32 %ret
+}
+
+; CHECK: attributes #0 = { convergent nocallback nofree nounwind willreturn memory(argmem: readwrite) }