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8382692: Use 'isb' instruction in SpinPause on windows-aarch64

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Reviewed-by: fbredberg, jsjolen
This commit is contained in:
Mat Carter 2026-07-31 17:20:20 +00:00
parent 835c7b1be5
commit b030a508d7
1 changed files with 14 additions and 1 deletions
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15
src/hotspot/os_cpu/windows_aarch64/os_windows_aarch64.cpp
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@ -291,6 +291,19 @@ int os::extra_bang_size_in_bytes() {
extern "C" {
int SpinPause() {
return 0;
using spin_wait_func_ptr_t = void (*)();
spin_wait_func_ptr_t func = CAST_TO_FN_PTR(spin_wait_func_ptr_t, StubRoutines::aarch64::spin_wait());
assert(func != nullptr, "StubRoutines::aarch64::spin_wait must not be null.");
(*func)();
// If StubRoutines::aarch64::spin_wait consists of only a RET,
// SpinPause can be considered as implemented. There will be a sequence
// of instructions for:
// - call of SpinPause
// - load of StubRoutines::aarch64::spin_wait stub pointer
// - indirect call of the stub
// - return from the stub
// - return from SpinPause
// So '1' always is returned.
return 1;
}
};