From: Jeff Law <jeffreyalaw@gmail.com>
To: gcc-patches@gcc.gnu.org, richard.sandiford@arm.com
Subject: Re: [PATCH] Allow targets to add USEs to asms
Date: Sat, 12 Nov 2022 18:07:08 -0700 [thread overview]
Message-ID: <607d31c4-d363-577a-6f0a-ae8e3604f10d@gmail.com> (raw)
In-Reply-To: <mpt5yfls8j1.fsf@arm.com>
On 11/11/22 10:30, Richard Sandiford via Gcc-patches wrote:
> Arm's SME has an array called ZA that for inline asm purposes
> is effectively a form of special-purpose memory. It doesn't
> have an associated storage type and so can't be passed and
> returned in normal C/C++ objects.
>
> We'd therefore like "za" in a clobber list to mean that an inline
> asm can read from and write to ZA. (Just reading or writing
> individually is unlikely to be useful, but we could add syntax
> for that too if necessary.)
>
> There is currently a TARGET_MD_ASM_ADJUST target hook that allows
> targets to add clobbers to an asm instruction. This patch
> extends that to allow targets to add USEs as well.
>
> Tested on aarch64-linux-gnu and x86_64-linux-gnu. Also tested by
> building cc1 for one target per affected CPU. OK to install?
>
> Richard
>
>
> gcc/
> * target.def (md_asm_adjust): Add a uses parameter.
> * doc/gccint/target-macros/tm.rst.in: Regenerate.
> * cfgexpand.cc (expand_asm_loc): Update call to md_asm_adjust.
> Handle any USEs created by the target.
> (expand_asm_stmt): Likewise.
> * recog.cc (asm_noperands): Handle asms with USEs.
> (decode_asm_operands): Likewise.
> * config/arm/aarch-common-protos.h (arm_md_asm_adjust): Add uses
> parameter.
> * config/arm/aarch-common.cc (arm_md_asm_adjust): Likewise.
> * config/arm/arm.cc (thumb1_md_asm_adjust): Likewise.
> * config/avr/avr.cc (avr_md_asm_adjust): Likewise.
> * config/cris/cris.cc (cris_md_asm_adjust): Likewise.
> * config/i386/i386.cc (ix86_md_asm_adjust): Likewise.
> * config/mn10300/mn10300.cc (mn10300_md_asm_adjust): Likewise.
> * config/nds32/nds32.cc (nds32_md_asm_adjust): Likewise.
> * config/pdp11/pdp11.cc (pdp11_md_asm_adjust): Likewise.
> * config/rs6000/rs6000.cc (rs6000_md_asm_adjust): Likewise.
> * config/s390/s390.cc (s390_md_asm_adjust): Likewise.
> * config/vax/vax.cc (vax_md_asm_adjust): Likewise.
> * config/visium/visium.cc (visium_md_asm_adjust): Likewise.
OK
jeff
prev parent reply other threads:[~2022-11-13 1:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-11 17:30 Richard Sandiford
2022-11-13 1:07 ` Jeff Law [this message]
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