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From: Bernhard Krug <b.krug@elektronenpumpe.de>
To: newlib@sourceware.org
Subject: libc: arm: setjmp jmp_buf exagerated size
Date: Tue, 14 Feb 2023 23:47:23 +0100	[thread overview]
Message-ID: <D94205CA-1195-4F8C-9373-954C62F7DE8B@elektronenpumpe.de> (raw)

Hello, 

using setjmp to implement eight coroutines on an ARM Cortex-M0+ the allocated size of .data escalates, in my example, from 476 bytes to 1444 bytes!

I think "libc: arm: fix setjmp abi non-conformance" shouldn't use jmp_buf made of 20 long long ints on a 32bit arm without fpu :D

Can the #ifndef device detection/decision tree from the setjmp asm/source file be also used in the headers to set reasonable sizes?

For my machine and use-case gcc emits asm copying ten registers (as expected) which would be rightly sized.

Thanks for your work and consideration :)

             reply	other threads:[~2023-02-14 22:47 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-14 22:47 Bernhard Krug [this message]
2023-02-15 11:09 ` [PATCH] " Bernhard Krug
2023-02-15 15:56   ` Bernhard Krug
2023-02-15 16:05   ` Bernhard Krug
2023-02-15 16:12   ` Richard Earnshaw
2023-02-15 16:40     ` Bernhard Krug
2023-02-15 17:01       ` Richard Earnshaw
2023-02-15 17:14         ` Bernhard Krug

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