There are unknown unwind opcodes (0xB) in Windows intrinsic functions introduced in commit https://github.com/openjdk/jdk17u-dev/commit/9f05c411e6d6bdf612cf0cf8b9fe4ca9ecde50d1#diff-a024df6bcd94607260545e647922261703a652dee1afadb1fa758f6e74a568d1

one such example: "dumpbin.exe /unwindinfo jsvml.dll" :

_unwind___svml_atan28_ha_z0_B1_B10: in https://github.com/openjdk/jdk17u-dev/blob/9f05c411e6d6bdf612cf0cf8b9fe4ca9ecde50d1/src/jdk.incubator.vector/windows/native/libsvml/svml_d_atan2_windows_x86.S

              DD 1873409 ; Unwind version: 1, Unwind flags: None, Size of prologue: 0x96, Count of codes: 28

              DD 6018198 ; Opcode 4: SAVE_NONVOL, register=r13, offset = 0x460 (728)

              DD 4614286 ; Opcode 8: SAVE_XMM128, register=XMM6, offset = 0x360 (1120)

              DD 3569795 ; Opcode 8: SAVE_XMM128, register=XMM7, offset = 0x4E0 (864)

              DD 4098168 ; Opcode 8: SAVE_XMM128, register=XMM8, offset = 0x4E0 (992)

              DD 4364397 ; Opcode 8: SAVE_XMM128, register=XMM9, offset = 0x4E0 (1056)

              DD 3844194 ; Opcode 8: SAVE_XMM128, register=XMM10, offset = 0x4E0 (928)

              DD 3323991 ; Opcode 8: SAVE_XMM128, register=XMM11, offset = 0x4E0 (800)

              DD 3065932 ; Opcode 8: SAVE_XMM128, register=XMM12, offset = 0x4E0 (736)

              DD 5167169 ; Opcode 8: SAVE_XMM128, register=XMM13, offset = 0x4E0 (1284)

              DD 5433398 ; Opcode 8: SAVE_XMM128, register=XMM14, offset = 0x520 (1312)

              DD 4913195 ; Opcode 8: SAVE_XMM128, register=XMM15, offset = 0x4A0 (1184)

              DD 11356960 ; Opcode B: SAVE_K, register=K4, offset = 0x568 (1384)

              DD 11426583 ; Opcode B: SAVE_K, register=K5, offset = 0x570 (1392)

              DD 11469067 ; Opcode 1 : ALLOC_LARGE, size=0x578 (1400)