[Clang] Support __bf16 type for SPIR/SPIR-V (#169012)

[wenju-he]

SPIR/SPIR-V are generic targets. Assume they support __bf16.

(cherry picked from commit c4254cd)

[wenju-he]

This is backport of c4254cd to 18.x branch

[llvmbot]

@llvm/pr-subscribers-clang

Author: Wenju He (wenju-he)

Changes

SPIR/SPIR-V are generic targets. Assume they support __bf16.

(cherry picked from commit c4254cd)

---

Full diff: https://github.com/llvm/llvm-project/pull/170233.diff

3 Files Affected:

• (modified) clang/lib/Basic/Targets/SPIR.h (+4)
• (added) clang/test/CodeGenOpenCL/__bf16.cl (+31)
• (modified) clang/test/SemaSYCL/bf16.cpp (+4-3)

diff --git a/clang/lib/Basic/Targets/SPIR.h b/clang/lib/Basic/Targets/SPIR.h index fa4a3bb1c82ee..f660343342b1f 100644 --- a/clang/lib/Basic/Targets/SPIR.h +++ b/clang/lib/Basic/Targets/SPIR.h @@ -101,6 +101,10 @@ class LLVM_LIBRARY_VISIBILITY BaseSPIRTargetInfo : public TargetInfo { UseAddrSpaceMapMangling = true; HasLegalHalfType = true; HasFloat16 = true; + HasBFloat16 = true; + HasFullBFloat16 = true; + BFloat16Width = BFloat16Align = 16; + BFloat16Format = &llvm::APFloat::BFloat(); // Define available target features // These must be defined in sorted order! NoAsmVariants = true; diff --git a/clang/test/CodeGenOpenCL/__bf16.cl b/clang/test/CodeGenOpenCL/__bf16.cl new file mode 100644 index 0000000000000..a40a795bc1600 --- /dev/null +++ b/clang/test/CodeGenOpenCL/__bf16.cl @@ -0,0 +1,31 @@ +// RUN: %clang_cc1 %s -cl-std=cl3.0 -emit-llvm -o - -triple spir-unknown-unknown | FileCheck %s +// RUN: %clang_cc1 %s -cl-std=cl3.0 -emit-llvm -o - -triple spirv64-unknown-unknown | FileCheck %s + +kernel void test(global __bf16 *a, global __bf16 *b){ +// CHECK-LABEL: spir_kernel void @test( +// CHECK: fadd bfloat +// CHECK: fsub bfloat +// CHECK: fmul bfloat +// CHECK: fdiv bfloat + + *b += *a; + *b -= *a; + *b *= *a; + *b /= *a; +} + +typedef __bf16 __bf16v4 __attribute((ext_vector_type(4))); + +kernel void test_v4(global __bf16v4 *a, global __bf16v4 *b){ +// CHECK-LABEL: spir_kernel void @test_v4( +// CHECK: fadd <4 x bfloat> +// CHECK: fsub <4 x bfloat> +// CHECK: fmul <4 x bfloat> +// CHECK: fdiv <4 x bfloat> + + *b += *a; + *b -= *a; + *b *= *a; + *b /= *a; +} + diff --git a/clang/test/SemaSYCL/bf16.cpp b/clang/test/SemaSYCL/bf16.cpp index d1b4776f34044..2ffb277b4eea1 100644 --- a/clang/test/SemaSYCL/bf16.cpp +++ b/clang/test/SemaSYCL/bf16.cpp @@ -1,8 +1,9 @@ // RUN: %clang_cc1 -triple spir64 -aux-triple x86_64-unknown-linux-gnu -fsycl-is-device -verify -fsyntax-only %s +// expected-no-diagnostics template <typename Name, typename Func> __attribute__((sycl_kernel)) void kernel(const Func &kernelFunc) { - kernelFunc(); // expected-note {{called by 'kernel}} + kernelFunc(); } void host_ok(void) { @@ -11,9 +12,9 @@ void host_ok(void) { int main() { host_ok(); - __bf16 var; // expected-note {{'var' defined here}} + __bf16 var; kernel<class variables>([=]() { - (void)var; // expected-error {{'var' requires 16 bit size '__bf16' type support, but target 'spir64' does not support it}} + (void)var; int B = sizeof(__bf16); }); 

[cor3ntin]

Only the 21.x branch is maintained currently.

https://llvm.org/docs/HowToReleaseLLVM.html#annual-release-schedule