linux-kernel - Re: riscv: llvm-compiler: calling convention violation: temporary register $t2 is used to pass the ninth function parameter

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Message-ID: <20220512082820.7t2rwwo3fffgwoxn@M910t>
Date:   Thu, 12 May 2022 16:28:20 +0800
From:   Changbin Du <changbin.du@...wei.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
CC:     Changbin Du <changbin.du@...wei.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Steven Rostedt <rostedt@...dmis.org>, <hw.huiwang@...wei.com>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <llvm@...ts.linux.dev>, <codegen-riscv@...course.llvm.org>,
        <llvmproject@...course.llvm.org>, <craig.topper@...ive.com>,
        <asb@...radbury.org>
Subject: Re: riscv: llvm-compiler: calling convention violation: temporary
 register $t2 is used to pass the ninth function parameter

On Wed, May 11, 2022 at 11:39:07AM -0700, Nick Desaulniers wrote:
> On Mon, May 9, 2022 at 11:54 PM Changbin Du <changbin.du@...wei.com> wrote:
> >
[snip]
> > I also built a simple test function with 9 parameters by clang and same cflags,
> > but cannot reproduce it. Maybe it is conditional?
> >
> > Simple test code:
> > __attribute__ ((noinline))
> > void test_func(int *a, int *b, int *c, int *d, int *e, int *f, int *g, int *h, int *i)
> > {
> >         printf("__find_rr_leaf: %d\n", *i);
> > }
> >
> > int main(void)
> > {
> >         int a,b,c,d,e,f,g,h,i = 100;
> >
> >         test_func(&a,&b,&c,&d,&e,&f,&g,&h,&i);
> >         return 0;
> > }
> 
> Hmm...any chance you could come up with a more concise test case then
> using creduce [0] or cvise [1]?
> [0] https://embed.cs.utah.edu/creduce/
> [1] https://github.com/marxin/cvise
> 
>
okay, let me try to reduce the orignal source with creduce.

> 
> 
> -- 
> Thanks,
> ~Nick Desaulniers

-- 
Cheers,
Changbin Du