9218f92838
This patch adds support for implicit casting between GNU vectors and SVE
vectors when `__ARM_FEATURE_SVE_BITS==N`, as defined by the Arm C
Language Extensions (ACLE, version 00bet5, section 3.7.3.3) for SVE [1].
This behavior makes it possible to use GNU vectors with ACLE functions
that operate on VLAT. For example:
typedef int8_t vec __attribute__((vector_size(32)));
vec f(vec x) { return svasrd_x(svptrue_b8(), x, 1); }
Tests are also added for implicit casting between GNU and fixed-length
SVE vectors created by the 'arm_sve_vector_bits' attribute. This
behavior makes it possible to use VLST with existing interfaces that
operate on GNUT. For example:
typedef int8_t vec1 __attribute__((vector_size(32)));
void f(vec1);
#if __ARM_FEATURE_SVE_BITS==256 && __ARM_FEATURE_SVE_VECTOR_OPERATORS
typedef svint8_t vec2 __attribute__((arm_sve_vector_bits(256)));
void g(vec2 x) { f(x); } // OK
#endif
The `__ARM_FEATURE_SVE_VECTOR_OPERATORS` feature macro indicates
interoperability with the GNU vector extension. This is the first patch
providing support for this feature, which once complete will be enabled
by the `-msve-vector-bits` flag, as the `__ARM_FEATURE_SVE_BITS` feature
currently is.
[1] https://developer.arm.com/documentation/100987/latest
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D87607
27 lines
1.0 KiB
C++
27 lines
1.0 KiB
C++
// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve -target-feature +bf16 -ffreestanding -fsyntax-only -verify -std=c++11 -msve-vector-bits=512 -fallow-half-arguments-and-returns %s
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// expected-no-diagnostics
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#include <stdint.h>
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#define N __ARM_FEATURE_SVE_BITS
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typedef __SVInt8_t svint8_t;
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typedef svint8_t fixed_int8_t __attribute__((arm_sve_vector_bits(N)));
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typedef int8_t gnu_int8_t __attribute__((vector_size(N / 8)));
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template<typename T> struct S { T var; };
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S<fixed_int8_t> s;
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// Test implicit casts between VLA and VLS vectors
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svint8_t to_svint8_t(fixed_int8_t x) { return x; }
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fixed_int8_t from_svint8_t(svint8_t x) { return x; }
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// Test implicit casts between GNU and VLA vectors
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svint8_t to_svint8_t__from_gnu_int8_t(gnu_int8_t x) { return x; }
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gnu_int8_t from_svint8_t__to_gnu_int8_t(svint8_t x) { return x; }
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// Test implicit casts between GNU and VLS vectors
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fixed_int8_t to_fixed_int8_t__from_gnu_int8_t(gnu_int8_t x) { return x; }
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gnu_int8_t from_fixed_int8_t__to_gnu_int8_t(fixed_int8_t x) { return x; }
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