From: Jeff Law <jeffreyalaw@gmail.com>
To: Fei Gao <gaofei@eswincomputing.com>, gcc-patches@gcc.gnu.org
Cc: kito.cheng@gmail.com, palmer@dabbelt.com
Subject: Re: [PATCH 2/4] [ifcvt] if convert x=c ? y+z : y by RISC-V Zicond like insns
Date: Mon, 30 Oct 2023 12:41:39 -0600 [thread overview]
Message-ID: <d0c17c09-2244-4815-8e0b-614d924fb2f4@gmail.com> (raw)
In-Reply-To: <20231030072523.26818-3-gaofei@eswincomputing.com>
On 10/30/23 01:25, Fei Gao wrote:
> Conditional add, if zero
> rd = (rc == 0) ? (rs1 + rs2) : rs1
> -->
> czero.nez rd, rs2, rc
> add rd, rs1, rd
>
> Conditional add, if non-zero
> rd = (rc != 0) ? (rs1 + rs2) : rs1
> -->
> czero.eqz rd, rs2, rc
> add rd, rs1, rd
>
> Co-authored-by: Xiao Zeng<zengxiao@eswincomputing.com>
>
> gcc/ChangeLog:
>
> * ifcvt.cc (noce_emit_czero): helper for noce_try_cond_zero_arith
> (noce_try_cond_zero_arith): handler for condtional zero op
> (noce_process_if_block): add noce_try_cond_zero_arith with hook control
>
> gcc/testsuite/ChangeLog:
>
> * gcc.target/riscv/zicond_ifcvt_opt.c: New test.
Just an intermediate follow-up. As I expected, the work we have
internally fixes all the cases included in this patch. Similarly for
patch #3.
jeff
next prev parent reply other threads:[~2023-10-30 18:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-30 7:25 [PATCH 0/4] add support for conditional zero operation Fei Gao
2023-10-30 7:25 ` [PATCH 1/4] [RISC-V]add hook to control Zicond based ifcvt opt Fei Gao
2023-10-30 15:12 ` Jeff Law
2023-10-30 7:25 ` [PATCH 2/4] [ifcvt] if convert x=c ? y+z : y by RISC-V Zicond like insns Fei Gao
2023-10-30 16:36 ` Jeff Law
2023-10-31 2:53 ` Fei Gao
2023-10-30 18:41 ` Jeff Law [this message]
2023-10-30 19:16 ` Jeff Law
2023-10-31 3:35 ` Fei Gao
2023-11-20 6:46 ` Jeff Law
2023-11-28 2:46 ` Fei Gao
2023-11-28 5:05 ` Jeff Law
2023-11-20 6:59 ` Jeff Law
2023-11-28 2:57 ` Fei Gao
2023-11-29 4:46 ` Jeff Law
2023-10-30 7:25 ` [PATCH 3/4] [ifcvt] if convert x=c ? y op z " Fei Gao
2023-11-20 7:02 ` Jeff Law
2023-10-30 7:25 ` [PATCH 4/4] [ifcvt] if convert x=c ? y&z " Fei Gao
2023-10-30 18:46 ` Jeff Law
2023-11-20 7:10 ` Jeff Law
2023-11-28 3:04 ` Fei Gao
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