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8381596: Adjust checks which use supports_ht() on x86 for hybrid CPUs

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Reviewed-by: iklam, iveresov
This commit is contained in:
Vladimir Kozlov 2026-04-03 15:58:48 +00:00
parent 4a4701106c
commit ba0aefba9c
2 changed files with 9 additions and 3 deletions
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6
src/hotspot/cpu/x86/vm_version_x86.cpp
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@ -1647,7 +1647,7 @@ void VM_Version::get_processor_features() {
}
#endif // COMPILER2
if ((supports_sse4_2() && supports_ht()) || supports_avx()) { // Newest Intel cpus
if (is_intel_modern_cpu()) { // Newest Intel cpus
if (FLAG_IS_DEFAULT(UseUnalignedLoadStores)) {
UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
}
@ -1883,7 +1883,7 @@ void VM_Version::get_processor_features() {
if (is_intel() && is_intel_server_family() && supports_sse3()) {
if (FLAG_IS_DEFAULT(AllocatePrefetchLines) &&
supports_sse4_2() && supports_ht()) { // Nehalem based cpus
is_intel_modern_cpu()) { // Nehalem based cpus
FLAG_SET_DEFAULT(AllocatePrefetchLines, 4);
}
#ifdef COMPILER2
@ -3316,7 +3316,7 @@ int VM_Version::allocate_prefetch_distance(bool use_watermark_prefetch) {
}
} else { // Intel
if (supports_sse3() && is_intel_server_family()) {
if (supports_sse4_2() && supports_ht()) { // Nehalem based cpus
if (is_intel_modern_cpu()) { // Nehalem based cpus
return 192;
} else if (use_watermark_prefetch) { // watermark prefetching on Core
return 384;

6
src/hotspot/cpu/x86/vm_version_x86.hpp
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@ -958,6 +958,12 @@ public:
static bool is_intel_darkmont();
static bool is_intel_modern_cpu() {
precond(is_intel()); // should be called only for intel CPU
// Efficient cores in hybrid CPU may not support hyper-threads.
return (supports_avx() || (supports_sse4_2() && (supports_ht() || supports_hybrid())));
}
static bool is_intel_tsc_synched_at_init();
static void insert_features_names(VM_Version::VM_Features features, stringStream& ss);