From: Xi Ruoyao <xry111@xry111.site>
To: Xiaolong Chen <chenxiaolong@loongson.cn>, gcc-patches@gcc.gnu.org
Cc: i@xen0n.name, xuchenghua@loongson.cn, chenglulu@loongson.cn
Subject: Re: [PATCH v1 4/4] LoongArch: Add tests for Loongson SX floating-point conversion instructions.
Date: Wed, 06 Sep 2023 18:56:05 +0800 [thread overview]
Message-ID: <1092975a1cdc4f1bd357d5499540faf755b65854.camel@xry111.site> (raw)
In-Reply-To: <20230906104537.51583-1-chenxiaolong@loongson.cn>
On Wed, 2023-09-06 at 18:45 +0800, Xiaolong Chen wrote:
> + *((int*)& __m128_op0[3]) = 0x004200a0;
> + *((int*)& __m128_op0[2]) = 0x00000000;
> + *((int*)& __m128_op0[1]) = 0x004200a0;
> + *((int*)& __m128_op0[0]) = 0x00200001;
These are aliasing rule violation and they will suddenly blow up when
GCC optimizer starts to optimize more aggressively based on the aliasing
rule.
Try not to use these (you can write a helper function to memcpy() into a
__m128). Or use -fno-strict-alising in dg-options.
--
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University
next prev parent reply other threads:[~2023-09-06 10:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-06 10:45 Xiaolong Chen
2023-09-06 10:56 ` Xi Ruoyao [this message]
2023-09-07 2:38 ` chenxiaolong
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