https://github.com/sbc100 updated
https://github.com/llvm/llvm-project/pull/117817
>From 9578cf12c95d2511975b9ede6edb3bddc5f5da74 Mon Sep 17 00:00:00 2001
From: Sam Clegg <s...@chromium.org>
Date: Tue, 26 Nov 2024 16:38:00 -0800
Subject: [PATCH] [WebAssembly] Implement %llvm.thread.pointer intrinsic. NFC
We can simply use the `__tls_base` global for this which is guaranteed
to be non-zero and unique per thread.
Fixes: #117433
---
clang/test/CodeGen/builtins-wasm.c | 5 +++
.../WebAssembly/WebAssemblyISelLowering.cpp | 11 +++++++
.../CodeGen/WebAssembly/thread_pointer.ll | 32 +++++++++++++++++++
3 files changed, 48 insertions(+)
create mode 100644 llvm/test/CodeGen/WebAssembly/thread_pointer.ll
diff --git a/clang/test/CodeGen/builtins-wasm.c
b/clang/test/CodeGen/builtins-wasm.c
index 7ee2ac5de3eac7..263cfd3ab4c691 100644
--- a/clang/test/CodeGen/builtins-wasm.c
+++ b/clang/test/CodeGen/builtins-wasm.c
@@ -740,3 +740,8 @@ __externref_t externref_null() {
// WEBASSEMBLY: tail call ptr addrspace(10) @llvm.wasm.ref.null.extern()
// WEBASSEMBLY-NEXT: ret
}
+
+void *tp (void) {
+ return __builtin_thread_pointer ();
+ // WEBASSEMBLY: call {{.*}} @llvm.thread.pointer()
+}
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
index 2d00889407ff48..94b49387b58f91 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
@@ -2089,6 +2089,17 @@ SDValue
WebAssemblyTargetLowering::LowerIntrinsic(SDValue Op,
}
return DAG.getNode(WebAssemblyISD::SHUFFLE, DL, Op.getValueType(), Ops);
}
+
+ case Intrinsic::thread_pointer: {
+ MVT PtrVT = getPointerTy(DAG.getDataLayout());
+ auto GlobalGet = PtrVT == MVT::i64 ? WebAssembly::GLOBAL_GET_I64
+ : WebAssembly::GLOBAL_GET_I32;
+ const char *TlsBase = MF.createExternalSymbolName("__tls_base");
+ return SDValue(
+ DAG.getMachineNode(GlobalGet, DL, PtrVT,
+ DAG.getTargetExternalSymbol(TlsBase, PtrVT)),
+ 0);
+ }
}
}
diff --git a/llvm/test/CodeGen/WebAssembly/thread_pointer.ll
b/llvm/test/CodeGen/WebAssembly/thread_pointer.ll
new file mode 100644
index 00000000000000..88c4c6aeb30b0b
--- /dev/null
+++ b/llvm/test/CodeGen/WebAssembly/thread_pointer.ll
@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=wasm32-unknown-unknown | FileCheck %s
--check-prefix=WASM32
+; RUN: llc < %s -mtriple=wasm64-unknown-unknown | FileCheck %s
--check-prefix=WASM64
+
+declare ptr @llvm.thread.pointer()
+
+define ptr @thread_pointer() nounwind {
+; wasm32-LABEL: thread_pointer:
+; wasm32: .functype thread_pointer () -> (i32)
+; wasm32-NEXT: # %bb.0:
+; wasm32-NEXT: global.get __tls_base
+; wasm32-NEXT: # fallthrough-return
+;
+; wasm64-LABEL: thread_pointer:
+; wasm64: .functype thread_pointer () -> (i64)
+; wasm64-NEXT: # %bb.0:
+; wasm64-NEXT: global.get __tls_base
+; wasm64-NEXT: # fallthrough-return
+; WASM32-LABEL: thread_pointer:
+; WASM32: .functype thread_pointer () -> (i32)
+; WASM32-NEXT: # %bb.0:
+; WASM32-NEXT: global.get __tls_base
+; WASM32-NEXT: # fallthrough-return
+;
+; WASM64-LABEL: thread_pointer:
+; WASM64: .functype thread_pointer () -> (i64)
+; WASM64-NEXT: # %bb.0:
+; WASM64-NEXT: global.get __tls_base
+; WASM64-NEXT: # fallthrough-return
+ %1 = tail call ptr @llvm.thread.pointer()
+ ret ptr %1
+}
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