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Unified Diff: src/base/cpu.cc

Issue 1977983003: [base] Implement CPU time on Windows. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 4 years, 7 months ago
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Index: src/base/cpu.cc
diff --git a/src/base/cpu.cc b/src/base/cpu.cc
index 12a38819197a90aa4d91dfbbef86aa64cb1f3455..a5ce6da23a56c246338f11b974847902e355d633 100644
--- a/src/base/cpu.cc
+++ b/src/base/cpu.cc
@@ -338,7 +338,8 @@ CPU::CPU()
has_vfp_(false),
has_vfp3_(false),
has_vfp3_d32_(false),
- is_fp64_mode_(false) {
+ is_fp64_mode_(false),
+ has_non_stop_time_stamp_counter_(false) {
memcpy(vendor_, "Unknown", 8);
#if V8_OS_NACL
// Portable host shouldn't do feature detection.
@@ -419,6 +420,12 @@ CPU::CPU()
has_sahf_ = (cpu_info[2] & 0x00000001) != 0;
}
fmeawad 2016/05/25 23:40:31 nit: Add a small comment to explain what happens h
lpy 2016/05/26 16:25:22 Done.
+ const int parameter_containing_non_stop_time_stamp_counter = 0x80000007;
+ if (num_ext_ids >= parameter_containing_non_stop_time_stamp_counter) {
+ __cpuid(cpu_info, parameter_containing_non_stop_time_stamp_counter);
+ has_non_stop_time_stamp_counter_ = (cpu_info[3] & (1 << 8)) != 0;
+ }
+
#elif V8_HOST_ARCH_ARM
#if V8_OS_LINUX
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