Re: Help with some assembler syntax

>> adrp Xn, dest >> add Xn, Xn, :lo12:dest >> blr Xn >> > > I don't suppose the branch predictor would like that very much, > though. Can't you keep the original arrangement, and use this sequence > instead? Or use the new sequence unconditionally, but nop out the add > instruction and

Re: Help with some assembler syntax

On Mon, 2015-12-07 at 10:51 +, Edward Nevill wrote: > Hi, > > Does anyone know how I do > > adrp x0, dest & ~0xfff > add x0, x0, dest & 0xfff > > in aarch64 assembler? Guessing here from experience with 32-bit ARM... adr x0, dest and the assembler with generate the

Re: Help with some assembler syntax

> adrp, x0, dest > add x0, x0, #:lo12:dest Thanks! Thats the syntax I wanted. The use case is I want to benchmark this as a way of generating far calls, for use within the JIT for when code cache becomes > 128m. At the moment we generate trampolines tramp: ldr Xn, here br Xn here .dword

Re: Help with some assembler syntax

On 7 December 2015 at 14:40, Ard Biesheuvel wrote: > On 7 December 2015 at 11:51, Edward Nevill wrote: >> Hi, >> >> Does anyone know how I do >> >> adrp x0, dest & ~0xfff >> add x0, x0, dest & 0xfff >> >> in aarch64 assembler? >> >

Re: Help with some assembler syntax

On 7 December 2015 at 11:51, Edward Nevill wrote: > Hi, > > Does anyone know how I do > > adrp x0, dest & ~0xfff > add x0, x0, dest & 0xfff > > in aarch64 assembler? > You can't. ADRP is PC relative, but rounded to page granularity, so you can't use it for