https://github.com/kosarev created
https://github.com/llvm/llvm-project/pull/147541
None
>From 24b368053741bf2c8e50ed027da8a9389f940e94 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicolai=20H=C3=A4hnle?= <nicolai.haeh...@amd.com>
Date: Mon, 7 Jul 2025 11:34:03 +0100
Subject: [PATCH] [AMDGPU][Clang] Support bfloat16 arithmetic for GFX950 and
GFX1250.
Co-authored-by: Ivan Kosarev <ivan.kosa...@amd.com>
---
clang/lib/Basic/Targets/AMDGPU.h | 2 ++
clang/test/CodeGen/AMDGPU/full-bf16.c | 23 +++++++++++++++++++++++
2 files changed, 25 insertions(+)
create mode 100644 clang/test/CodeGen/AMDGPU/full-bf16.c
diff --git a/clang/lib/Basic/Targets/AMDGPU.h b/clang/lib/Basic/Targets/AMDGPU.h
index 509128f3cf070..006c2fe475a94 100644
--- a/clang/lib/Basic/Targets/AMDGPU.h
+++ b/clang/lib/Basic/Targets/AMDGPU.h
@@ -451,6 +451,8 @@ class LLVM_LIBRARY_VISIBILITY AMDGPUTargetInfo final :
public TargetInfo {
CUMode = false;
else if (F == "+image-insts")
HasImage = true;
+ else if (F == "+gfx950-insts" || F == "+gfx1250-insts")
+ HasFullBFloat16 = true;
bool IsOn = F.front() == '+';
StringRef Name = StringRef(F).drop_front();
if (!llvm::is_contained(TargetIDFeatures, Name))
diff --git a/clang/test/CodeGen/AMDGPU/full-bf16.c
b/clang/test/CodeGen/AMDGPU/full-bf16.c
new file mode 100644
index 0000000000000..7770d02c59df1
--- /dev/null
+++ b/clang/test/CodeGen/AMDGPU/full-bf16.c
@@ -0,0 +1,23 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
UTC_ARGS: --version 5
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa-gnu -target-cpu gfx950 -emit-llvm
-o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa-gnu -target-cpu gfx1250
-emit-llvm -o - %s | FileCheck %s
+
+// CHECK-LABEL: define dso_local bfloat @div(
+// CHECK-SAME: bfloat noundef [[A:%.*]], bfloat noundef [[B:%.*]])
#[[ATTR0:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: [[RETVAL:%.*]] = alloca bfloat, align 2, addrspace(5)
+// CHECK-NEXT: [[A_ADDR:%.*]] = alloca bfloat, align 2, addrspace(5)
+// CHECK-NEXT: [[B_ADDR:%.*]] = alloca bfloat, align 2, addrspace(5)
+// CHECK-NEXT: [[RETVAL_ASCAST:%.*]] = addrspacecast ptr addrspace(5)
[[RETVAL]] to ptr
+// CHECK-NEXT: [[A_ADDR_ASCAST:%.*]] = addrspacecast ptr addrspace(5)
[[A_ADDR]] to ptr
+// CHECK-NEXT: [[B_ADDR_ASCAST:%.*]] = addrspacecast ptr addrspace(5)
[[B_ADDR]] to ptr
+// CHECK-NEXT: store bfloat [[A]], ptr [[A_ADDR_ASCAST]], align 2
+// CHECK-NEXT: store bfloat [[B]], ptr [[B_ADDR_ASCAST]], align 2
+// CHECK-NEXT: [[TMP0:%.*]] = load bfloat, ptr [[A_ADDR_ASCAST]], align 2
+// CHECK-NEXT: [[TMP1:%.*]] = load bfloat, ptr [[B_ADDR_ASCAST]], align 2
+// CHECK-NEXT: [[DIV:%.*]] = fdiv bfloat [[TMP0]], [[TMP1]]
+// CHECK-NEXT: ret bfloat [[DIV]]
+//
+__bf16 div(__bf16 a, __bf16 b) {
+ return a / b;
+}
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