42e79d9771
This allows the user to set the size of the scalable vector so they can be used in structs and as the type of global variables. This works by representing the type as a fixed vector instead of a scalable vector in IR. Conversions to and from scalable vectors are made where necessary like function arguments/returns and intrinsics. This features has been requested here https://github.com/riscv-non-isa/rvv-intrinsic-doc/issues/176 I know arm_sve_vector_bits is used by the Eigen library so this could be used to port Eigen to RVV. This patch adds a new preprocessor define `__riscv_v_fixed_vlen` that is set when -mrvv_vector_bits is passed on the command line. The code is largely based on the AArch64 code. A lot of code was copy/pasted and then modiied to RVV. There may be some opportunities for sharing. This first patch only supports the LMUL=1 types. Additional changes will be needed to support other LMULs. I have also not supported mask vectors. Differential Revision: https://reviews.llvm.org/D145088
25 lines
1.0 KiB
C++
25 lines
1.0 KiB
C++
// RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +zve64x -ffreestanding -fsyntax-only -verify -std=c++11 -mvscale-min=4 -mvscale-max=4 -Wconversion %s
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// expected-no-diagnostics
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#include <stdint.h>
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typedef __rvv_int8m1_t vint8m1_t;
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typedef vint8m1_t fixed_int8m1_t __attribute__((riscv_rvv_vector_bits(__riscv_v_fixed_vlen)));
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typedef int8_t gnu_int8m1_t __attribute__((vector_size(__riscv_v_fixed_vlen / 8)));
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template<typename T> struct S { T var; };
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S<fixed_int8m1_t> s;
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// Test implicit casts between VLA and VLS vectors
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vint8m1_t to_vint8m1_t(fixed_int8m1_t x) { return x; }
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fixed_int8m1_t from_vint8m1_t(vint8m1_t x) { return x; }
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// Test implicit casts between GNU and VLA vectors
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vint8m1_t to_vint8m1_t__from_gnu_int8m1_t(gnu_int8m1_t x) { return x; }
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gnu_int8m1_t from_vint8m1_t__to_gnu_int8m1_t(vint8m1_t x) { return x; }
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// Test implicit casts between GNU and VLS vectors
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fixed_int8m1_t to_fixed_int8m1_t__from_gnu_int8m1_t(gnu_int8m1_t x) { return x; }
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gnu_int8m1_t from_fixed_int8m1_t__to_gnu_int8m1_t(fixed_int8m1_t x) { return x; }
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