zuochunwei commented on a change in pull request #8042:
URL: https://github.com/apache/incubator-doris/pull/8042#discussion_r805559865
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File path: be/src/service/doris_main.cpp
##########
@@ -74,6 +78,194 @@ static void thrift_output(const char* x) {
} // namespace doris
+// These code is referenced from clickhouse
+// It is used to check the SIMD instructions
+enum class InstructionFail
+{
+ NONE = 0,
+ SSE3 = 1,
+ SSSE3 = 2,
+ SSE4_1 = 3,
+ SSE4_2 = 4,
+ POPCNT = 5,
+ AVX = 6,
+ AVX2 = 7,
+ AVX512 = 8
+};
+
+#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
+
+auto instruction_fail_to_string(InstructionFail fail)
+{
+ switch (fail)
+ {
+#define ret(x) return std::make_tuple(STDERR_FILENO, x, ARRAY_SIZE(x) - 1)
+ case InstructionFail::NONE:
+ ret("NONE");
+ case InstructionFail::SSE3:
+ ret("SSE3");
+ case InstructionFail::SSSE3:
+ ret("SSSE3");
+ case InstructionFail::SSE4_1:
+ ret("SSE4.1");
+ case InstructionFail::SSE4_2:
+ ret("SSE4.2");
+ case InstructionFail::POPCNT:
+ ret("POPCNT");
+ case InstructionFail::AVX:
+ ret("AVX");
+ case InstructionFail::AVX2:
+ ret("AVX2");
+ case InstructionFail::AVX512:
+ ret("AVX512");
+ }
+ __builtin_unreachable();
+}
+
+
+sigjmp_buf jmpbuf;
+
+[[noreturn]] void sig_ill_check_handler(int, siginfo_t *, void *)
+{
+ siglongjmp(jmpbuf, 1);
+}
+
+/// Check if necessary SSE extensions are available by trying to execute some
sse instructions.
+/// If instruction is unavailable, SIGILL will be sent by kernel.
+void check_required_instructions_impl(volatile InstructionFail & fail)
Review comment:
因为用了sigsetjmp和siglongjmp，在异步信号的环境下，使用volatile确保每次都是都从内存里读取fail变量的值，而不用寄存器里的缓存吧
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