[Nasm-bugs] [Bug 3392773] mov [rcx + r9*8 * + 8*0], r11 is wrongly accepted

noreply-nasm at dev.nasm.us noreply-nasm at dev.nasm.us
Wed Oct 5 11:29:43 PDT 2022


H. Peter Anvin <hpa at zytor.com> changed:

           What    |Removed                     |Added
             Status|OPEN                        |CLOSED
         Resolution|---                         |INVALID

--- Comment #1 from H. Peter Anvin <hpa at zytor.com> ---
mov [rcx + r9*8 * + 8*0], r11 is not a syntax error. However, it is an error on
your part: in this case, + is parsed as a unary + operator, and the end result
is [rcx + r9*8*8*0], which turns into [rcx + r9*0], which turns into [rcx].

[rcx + r9*8 + 8*1] is rejected because [rcx + r9*8*8*1] is [rcx + r9*64], and
only scaled-SIB instructions support a multiplier that large.

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