linux-kernel - Re: [PATCH 7/9] LoongArch: Tweak CFLAGS for Clang compatibility

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Message-ID: <22d794613f70b04544e39e8861737af09365ae8a.camel@xry111.site>
Date:   Sat, 24 Jun 2023 01:00:37 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     WANG Xuerui <kernel@...0n.name>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     WANG Rui <wangrui@...ngson.cn>, loongarch@...ts.linux.dev,
        linux-kbuild@...r.kernel.org, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, WANG Xuerui <git@...0n.name>
Subject: Re: [PATCH 7/9] LoongArch: Tweak CFLAGS for Clang compatibility

On Fri, 2023-06-23 at 21:43 +0800, WANG Xuerui wrote:

> -cflags-y                       += -G0 -pipe -msoft-float

-msoft-float should not be removed.  Our consensus (made when I was
developing https://gcc.gnu.org/r13-6500) is -mabi=lp64s does *not*
disable floating point instructions, but only disable FPRs for passing
arguments and return values.  So w/o -msoft-float (or -mfpu=none) GCC is
allowed to generate FP instructions everywhere in kernel and it may
cause kernel FPD exception in the future.

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University