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Unified Diff: src/base/atomicops_internals_x86_gcc.cc

Issue 331803006: Partial revert of r21901 (2nd attempt) (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 6 months ago
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Index: src/base/atomicops_internals_x86_gcc.cc
diff --git a/src/base/atomicops_internals_x86_gcc.cc b/src/base/atomicops_internals_x86_gcc.cc
index ffc8bce0b0ac6b22053ecb04eff6143250d70e5e..969f2371b0b58cd2b9e574dc51a9cec522b6dbe7 100644
--- a/src/base/atomicops_internals_x86_gcc.cc
+++ b/src/base/atomicops_internals_x86_gcc.cc
@@ -42,6 +42,9 @@ namespace base {
// default values should hopefully be pretty safe.
struct AtomicOps_x86CPUFeatureStruct AtomicOps_Internalx86CPUFeatures = {
false, // bug can't exist before process spawns multiple threads
+#if !defined(__SSE2__)
+ false, // no SSE2
+#endif
};
} } // namespace v8::base
@@ -87,6 +90,11 @@ void AtomicOps_Internalx86CPUFeaturesInit() {
} else {
AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug = false;
}
+
+#if !defined(__SSE2__)
+ // edx bit 26 is SSE2 which we use to tell use whether we can use mfence
+ AtomicOps_Internalx86CPUFeatures.has_sse2 = ((edx >> 26) & 1);
+#endif
}
class AtomicOpsx86Initializer {
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