I am trying to understand below code:
ldrvsb r3, [r1], #1 // V set
ldrcsh r4, [r1], #2 // C set
ldreq r5, [r1], #4 // Z set
strvsb r3, [r0], #1
strcsh r4, [r0], #2
streq r5, [r0], #4
ldmmiia r1!, {r3-r4} // N set
stmmiia r0!, {r3-r4}
While compiling using GCC toolchain above code works fine.
But when compiling using clang I see invalid instruction for ldrvsb, ldrcsh, strcsh, strvcb, ldmmiia, stmmiia.
Refer below link: https://github.com/littlekernel/lk/blob/33b94d9b97ef835d68aca2e5edb54f7267c70625/lib/libc/string/arch/arm/arm/memcpy.S
As clang don't support it, I need to replace above instructions with equivalent one. Need to understand which are they respectively.
Thanks in advance.