Vortex 2.0 changes:

+ Microarchitecture optimizations
+ 64-bit support
+ Xilinx FPGA support
+ LLVM-16 support
+ Refactoring and quality control fixes

tests/regression/basic/start.S

@@ -0,0 +1,13 @@
+.section .init, "ax"
+.global _start
+.type _start, @function
+_start:
+  # call main routine
+  call main
+
+  # dump perf counter
+  call vx_perf_dump
+
+  # end execution
+  .insn r 0x0b, 0, 0, x0, x0, x0
+.size _start, .-_start