The directive is not documented on https://pkg.go.dev/cmd/internal/obj/x86.
`grep -l -R PCALIGN *` run in `cmd/interal/obj` shows for the freshest
master:
arm64/doc.go
arm64/asm7.go
arm64/asm_arm64_test.go
link.go
ppc64/doc.go
ppc64/asm9.go
ppc64/asm_test.go
util.go
Seems it's not implemented. When tried to use it, I got the following error:
# main
asm: asmins: missing op 00000 (<unknown line number>) PCALIGN
$16
asm: assembly failed
Sample asm code to check this:
---asmfun_amd64.s---
#include "textflag.h"
TEXT ·asmfun(SB), NOSPLIT, $0
PCALIGN $16
RET
---eof---
---main.go---
package main
// go:noescape
func asmfun()
func main() { asmfun() }
---eof---
w.
On Friday, February 25, 2022 at 2:21:41 AM UTC+1 Ian Lance Taylor wrote:
> On Thu, Feb 24, 2022 at 9:40 AM Wojciech Muła <wojte...@gmail.com> wrote:
> >
> > I'm writing an implementation in x86 assembler and I need to force a
> certain alignment of blocks of code (as it affects performance). I found
> that there's PCALIGN directive, but it's only available for the PPC
> architecture. It does not work for x86.
> >
> > Is there any easy way to achieve this for x86? If I had one loop, it
> won't be a problem --- I'd just put a few `BYTE $0x90` and move on. The
> problem is my code is huge, partially autogenerated with few variants.
> >
> > Any hints?
>
> As far as I can tell PCALIGN is implemented for all architectures.
>
> Ian
>
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