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[AArch64][compiler-rt] Add a function returning the current vector length #92921

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Merged
kmclaughlin-arm merged 6 commits into from
Jun 5, 2024
Merged

[AArch64][compiler-rt] Add a function returning the current vector length #92921

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1038d54
[AArch64][compiler-rt] Add a function returning the current vector le…
kmclaughlin-arm May 21, 2024
2baec75
- Run clang-format
kmclaughlin-arm May 21, 2024
75c2ae9
- Changes based on support routine added to the ABI document, see:
kmclaughlin-arm May 22, 2024
455bb3a
- Replaced use of __arm_in_streaming_mode from arm_sme.h with __arm_s…
kmclaughlin-arm May 30, 2024
5edc405
- Renamed get_features to __get_aarch64_features in aarch64.h
kmclaughlin-arm May 31, 2024
6a0a1fc
- Removed CONSTRUCTOR_ATTRIBUTE from __init_cpu_features declaration.
kmclaughlin-arm Jun 3, 2024
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23 changes: 23 additions & 0 deletions compiler-rt/lib/builtins/aarch64/sme-abi-init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include "../cpu_model/aarch64.c"

@efriedma-quic efriedma-quic May 21, 2024

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cpu_model/aarch64.c isn't a header; including it seem wrong.


__attribute__((visibility("hidden"), nocommon))
_Bool __aarch64_has_sme_and_tpidr2_el0;

Expand Down Expand Up @@ -50,3 +52,24 @@ __attribute__((constructor(90)))
static void init_aarch64_has_sme(void) {
__aarch64_has_sme_and_tpidr2_el0 = has_sme();
}

#if __GNUC__ >= 9
#pragma GCC diagnostic ignored "-Wprio-ctor-dtor"
#endif
__attribute__((constructor(90))) void get_aarch64_cpu_features(void) {
if (!__aarch64_cpu_features.features)
__init_cpu_features();
}

__attribute__((target("sve"))) long emit_cntd(void) {

@efriedma-quic efriedma-quic May 21, 2024

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static?

long vl;
__asm__ __volatile__("cntd %0" : "=r"(vl));
return vl;
}

long get_runtime_vl(void) {

@efriedma-quic efriedma-quic May 21, 2024

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This probably should be prefixed with __aarch64

@kmclaughlin-arm kmclaughlin-arm May 30, 2024

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Hi @efriedma-quic, I've added this routine to the ABI document in ARM-software/abi-aa#263 and renamed it to __arm_get_current_vg.

if (__aarch64_cpu_features.features & (1ULL << FEAT_SVE))
return emit_cntd();
else
return 0;
}