From: Iain Sandoe <idsandoe@googlemail.com>
To: Richard Sandiford <richard.sandiford@arm.com>
Cc: "Qian, Jianhua" <qianjh@cn.fujitsu.com>,
"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] fix testcase gcc.target/aarch64/insv_1.c
Date: Thu, 27 Aug 2020 09:39:48 +0100 [thread overview]
Message-ID: <92CC8A71-D279-4D12-BCA5-3A724308E267@googlemail.com> (raw)
In-Reply-To: <mptr1rs8qku.fsf@arm.com>
Richard Sandiford <richard.sandiford@arm.com> wrote:
> "Qian, Jianhua" <qianjh@cn.fujitsu.com> writes:
>> Hi Richard
>>
>> I found that some instructions are using '#' before immediate value,
>> and others are not. For example
>> (define_insn "insv_imm<mode>"
>> [(set (zero_extract:GPI (match_operand:GPI 0 "register_operand" "+r")
>> (const_int 16)
>> (match_operand:GPI 1 "const_int_operand" "n"))
>> (match_operand:GPI 2 "const_int_operand" "n"))]
>> "UINTVAL (operands[1]) < GET_MODE_BITSIZE (<MODE>mode)
>> && UINTVAL (operands[1]) % 16 == 0"
>> "movk\\t%<w>0, %X2, lsl %1"
>> [(set_attr "type" "mov_imm")]
>> )
>>
>> Are there any standards for this?
>
> No, it's unfortunately inconsistent. FWIW, if we were going to change
> this,
> personally I've a slight preference for having the “#”.
Absence of the # makes assemblers based on the LLVM backend reject GCC’s
output, as such I’ve got a strong preference for adding it (I’ve got some
local
patches for this already).
e.g.
https://github.com/iains/gcc-darwin-arm64/commit/526ffb6b34ddb848853016cd14a438683aa0e6de
(hacking branch, please don’t shoot me, yet :) )
Iain
next prev parent reply other threads:[~2020-08-27 8:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 2:57 Qian Jianhua
2020-08-26 10:08 ` Richard Sandiford
2020-08-27 3:25 ` Qian, Jianhua
2020-08-27 8:01 ` Richard Sandiford
2020-08-27 8:39 ` Iain Sandoe [this message]
2020-08-28 2:53 ` Qian, Jianhua
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