On Mon, 20 Nov 2017 15:20:14 +0000 Mark Rutland <mark.rutland@xxxxxxx> wrote: > On Wed, Nov 15, 2017 at 01:34:26PM -0800, Sami Tolvanen wrote: > > CONFIG_LTO_CLANG requires the use of clang's integrated assembler, > > which doesn't understand the inline assembly in aes-ce-cipher.c. > > Disable LTO for the file to work around the issue. > > Could you elaborate on what the integrated asembler doesn't like? > > It's not entirely clear at a glance, as the asm in that file doesn't > seem to do anything that obscure. > > Is it a bug? Turns out, integrated assembler doesn't like this instruction in aes_sub(): umov %w[out], v0.4s[0] Specifically, it barks at "v0.4s[0]" part. And the way I read the spec, it's quite correct in not accepting this argument. From UMOV description: UMOV <Wd>, <Vn>.<Ts>[<index>] ... <Ts> For the 32-bit variant: is an element size specifier, encoded in the "imm5" field. It can have the following values: B when imm5 = xxxx1 H when imm5 = xxx10 S when imm5 = xx100 With "v0.s[0]" it builds fine. Ard, since this is your code, can you comment? Feels like a typo. Regards, Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
