https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90346
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |hjl.tools at gmail dot com,
| |uros at gcc dot gnu.org
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r263196, where:
+(define_insn "speculation_barrier"
+ [(unspec_volatile [(const_int 0)] UNSPECV_SPECULATION_BARRIER)]
+ ""
+ "lfence"
+ [(set_attr "type" "other")
+ (set_attr "length" "3")])
+
was added. lfence is SSE2 instruction, so the question is what to for older
CPUs. Does it make sense to use __builtin_speculation_safe_value for such old
CPUs? Are the CPUs really affected by SPECTRE v1?
