https://github.com/jhuber6 created
https://github.com/llvm/llvm-project/pull/81277
Summary:
Some recent support made usage of `__nvvm_reflect` more consistent. We
should expose it as an intrinsic rather than forcing users to externally
define the function.
>From 7b97388a5f251684cf4ae69c3b0cae0ff6fe1397 Mon Sep 17 00:00:00 2001
From: Joseph Huber <hube...@outlook.com>
Date: Fri, 9 Feb 2024 10:50:20 -0600
Subject: [PATCH] [NVPTX] Add clang builtin for `__nvvm_reflect` intrinsic
Summary:
Some recent support made usage of `__nvvm_reflect` more consistent. We
should expose it as an intrinsic rather than forcing users to externally
define the function.
---
clang/include/clang/Basic/BuiltinsNVPTX.def | 1 +
clang/test/CodeGen/builtins-nvptx.c | 8 ++++++++
llvm/include/llvm/IR/IntrinsicsNVVM.td | 5 +++--
3 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/clang/include/clang/Basic/BuiltinsNVPTX.def
b/clang/include/clang/Basic/BuiltinsNVPTX.def
index 7819e71d7fe2aa..8d3c5e69d55cf4 100644
--- a/clang/include/clang/Basic/BuiltinsNVPTX.def
+++ b/clang/include/clang/Basic/BuiltinsNVPTX.def
@@ -159,6 +159,7 @@ BUILTIN(__nvvm_read_ptx_sreg_pm3, "i", "n")
BUILTIN(__nvvm_prmt, "UiUiUiUi", "")
BUILTIN(__nvvm_exit, "v", "r")
+BUILTIN(__nvvm_reflect, "UicC*", "r")
TARGET_BUILTIN(__nvvm_nanosleep, "vUi", "n", AND(SM_70, PTX63))
// Min Max
diff --git a/clang/test/CodeGen/builtins-nvptx.c
b/clang/test/CodeGen/builtins-nvptx.c
index ad7c27f2d60d26..4dba7670b5c43e 100644
--- a/clang/test/CodeGen/builtins-nvptx.c
+++ b/clang/test/CodeGen/builtins-nvptx.c
@@ -44,6 +44,14 @@ __device__ int read_tid() {
}
+__device__ bool reflect() {
+
+// CHECK: call i32 @llvm.nvvm.reflect(ptr {{.*}})
+
+ unsigned x = __nvvm_reflect("__CUDA_ARCH");
+ return x >= 700;
+}
+
__device__ int read_ntid() {
// CHECK: call i32 @llvm.nvvm.read.ptx.sreg.ntid.x()
diff --git a/llvm/include/llvm/IR/IntrinsicsNVVM.td
b/llvm/include/llvm/IR/IntrinsicsNVVM.td
index d825dc82156432..f7b0fe926959b1 100644
--- a/llvm/include/llvm/IR/IntrinsicsNVVM.td
+++ b/llvm/include/llvm/IR/IntrinsicsNVVM.td
@@ -1624,8 +1624,9 @@ def int_nvvm_compiler_error :
def int_nvvm_compiler_warn :
Intrinsic<[], [llvm_anyptr_ty], [], "llvm.nvvm.compiler.warn">;
-def int_nvvm_reflect :
- Intrinsic<[llvm_i32_ty], [llvm_anyptr_ty], [IntrNoMem], "llvm.nvvm.reflect">;
+def int_nvvm_reflect :
+ Intrinsic<[llvm_i32_ty], [llvm_ptr_ty], [IntrNoMem], "llvm.nvvm.reflect">,
+ ClangBuiltin<"__nvvm_reflect">;
// isspacep.{const, global, local, shared}
def int_nvvm_isspacep_const
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