gcc/testsuite/selftests/x86_64/unspec.rtl

(function "test_unspec"
  (insn-chain
    (block 2
      (edge-from entry (flags "FALLTHRU"))
      (cinsn 1 (set (mem/v:BLK (0|scratch:DI) [0  A8])
                    (unspec:BLK [
                            (mem/v:BLK (reuse_rtx 0) [0  A8])
                        ] UNSPEC_MEMORY_BLOCKAGE)) "../../src/gcc/testsuite/gcc.dg/rtl/test.c":2
                 (nil))

      (cinsn 2 (set (mem/v:BLK (1|scratch:DI) [0  A8])
                    (unspec_volatile:BLK [
                            (mem/v:BLK (reuse_rtx 1) [0  A8])
                        ] UNSPECV_RDTSCP)) "../../src/gcc/testsuite/gcc.dg/rtl/test.c":2
                 (nil))

      (edge-to exit (flags "FALLTHRU"))
    ) ;; block 2
  ) ;; insn-chain
) ;; function