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6808665: Use486InstrsOnly aborts 32-bit VM

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The code supporting -XX:+/-Use486InstrsOnly was removed.

Reviewed-by: dholmes, thartmann, vlivanov
This commit is contained in:
Jamsheed Mohammed 2015-12-09 11:06:39 +01:00 • committed by Tobias Hartmann
parent a1bb5b8456
commit 1f2a9c1407
2 changed files with 12 additions and 17 deletions
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3
hotspot/src/cpu/x86/vm/globals_x86.hpp
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@ -175,9 +175,6 @@ define_pd_global(bool, PreserveFramePointer, false);
"Use RTM Xend instead of Xabort when lock busy") \ "Use RTM Xend instead of Xabort when lock busy") \
\ \
/* assembler */ \ /* assembler */ \
product(bool, Use486InstrsOnly, false, \
"Use 80486 Compliant instruction subset") \
\
product(bool, UseCountLeadingZerosInstruction, false, \ product(bool, UseCountLeadingZerosInstruction, false, \
"Use count leading zeros instruction") \ "Use count leading zeros instruction") \
\ \

26
hotspot/src/cpu/x86/vm/vm_version_x86.cpp
View file

@ -473,23 +473,21 @@ void VM_Version::get_processor_features() {
// i486 internal cache is both I&D and has a 16-byte line size // i486 internal cache is both I&D and has a 16-byte line size
_L1_data_cache_line_size = 16; _L1_data_cache_line_size = 16;
if (!Use486InstrsOnly) { // Get raw processor info
// Get raw processor info
get_cpu_info_stub(&_cpuid_info); get_cpu_info_stub(&_cpuid_info);
assert_is_initialized(); assert_is_initialized();
_cpu = extended_cpu_family(); _cpu = extended_cpu_family();
_model = extended_cpu_model(); _model = extended_cpu_model();
_stepping = cpu_stepping(); _stepping = cpu_stepping();
if (cpu_family() > 4) { // it supports CPUID if (cpu_family() > 4) { // it supports CPUID
_cpuFeatures = feature_flags(); _cpuFeatures = feature_flags();
// Logical processors are only available on P4s and above, // Logical processors are only available on P4s and above,
// and only if hyperthreading is available. // and only if hyperthreading is available.
_logical_processors_per_package = logical_processor_count(); _logical_processors_per_package = logical_processor_count();
_L1_data_cache_line_size = L1_line_size(); _L1_data_cache_line_size = L1_line_size();
}
} }
_supports_cx8 = supports_cmpxchg8(); _supports_cx8 = supports_cmpxchg8();