e621757365
Pursuant to discussions at https://discourse.llvm.org/t/rfc-c-23-p1467r9-extended-floating-point-types-and-standard-names/70033/22, this commit enhances the handling of the __bf16 type in Clang. - Firstly, it upgrades __bf16 from a storage-only type to an arithmetic type. - Secondly, it changes the mangling of __bf16 to DF16b on all architectures except ARM. This change has been made in accordance with the finalization of the mangling for the std::bfloat16_t type, as discussed at https://github.com/itanium-cxx-abi/cxx-abi/pull/147. - Finally, this commit extends the existing excess precision support to the __bf16 type. This applies to hardware architectures that do not natively support bfloat16 arithmetic. Appropriate tests have been added to verify the effects of these changes and ensure no regressions in other areas of the compiler. Reviewed By: rjmccall, pengfei, zahiraam Differential Revision: https://reviews.llvm.org/D150913
57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify=scalar,neon -std=c++11 \
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// RUN: -triple aarch64-arm-none-eabi -target-cpu cortex-a75 \
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// RUN: -target-feature +bf16 -target-feature +neon -Wno-unused %s
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// RUN: %clang_cc1 -fsyntax-only -verify=scalar,neon -std=c++11 \
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// RUN: -triple arm-arm-none-eabi -target-cpu cortex-a53 \
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// RUN: -target-feature +bf16 -target-feature +neon -Wno-unused %s
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// The types should be available under AArch64 even without the bf16 feature
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// RUN: %clang_cc1 -fsyntax-only -verify=scalar -DNONEON -std=c++11 \
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// RUN: -triple aarch64-arm-none-eabi -target-cpu cortex-a75 \
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// RUN: -target-feature -bf16 -target-feature +neon -Wno-unused %s
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// REQUIRES: aarch64-registered-target || arm-registered-target
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void test(bool b) {
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__bf16 bf16;
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bf16 + bf16;
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bf16 - bf16;
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bf16 * bf16;
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bf16 / bf16;
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__fp16 fp16;
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bf16 + fp16;
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fp16 + bf16;
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bf16 - fp16;
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fp16 - bf16;
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bf16 * fp16;
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fp16 * bf16;
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bf16 / fp16;
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fp16 / bf16;
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bf16 = fp16; // scalar-error {{assigning to '__bf16' from incompatible type '__fp16'}}
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fp16 = bf16; // scalar-error {{assigning to '__fp16' from incompatible type '__bf16'}}
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bf16 + (b ? fp16 : bf16);
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}
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#ifndef NONEON
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#include <arm_neon.h>
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void test_vector(bfloat16x4_t a, bfloat16x4_t b, float16x4_t c) {
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a + b;
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a - b;
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a * b;
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a / b;
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a + c;
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a - c;
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a * c;
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a / c;
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c + b;
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c - b;
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c * b;
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c / b;
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}
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#endif |