From: Tom Tromey <tom@tromey.com>
To: Palmer Dabbelt <palmer@sifive.com>
Cc: andrew.burgess@embecosm.com, gdb-patches@sourceware.org
Subject: Re: [PATCH] gdb: Ensure compiler doesn't optimise variable out in test
Date: Thu, 30 Aug 2018 02:31:00 -0000 [thread overview]
Message-ID: <87in3svb54.fsf@tromey.com> (raw)
In-Reply-To: <mhng-c147d665-ff40-415d-98a2-1eea608c9e54@palmer-si-x1c4> (Palmer Dabbelt's message of "Wed, 29 Aug 2018 17:21:58 -0700 (PDT)")
>>>>> "Palmer" == Palmer Dabbelt <palmer@sifive.com> writes:
Palmer> Isn't the compiler still free to kill "a" here because it can see into
Palmer> use_a() and therefor inline it? I'd expected it to choose to inline
Palmer> use_a(), as doing nothing is always cheaper than calling a function.
It is but in practice gdb compiles without optimization in most cases
and compilers generally don't bother in that situation. Though if
there's a readily available, more principled fix, that would be fine
too.
Tom
next prev parent reply other threads:[~2018-08-30 2:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-29 18:03 Andrew Burgess
2018-08-29 18:27 ` Tom Tromey
2018-08-30 0:22 ` Palmer Dabbelt
2018-08-30 2:31 ` Tom Tromey [this message]
2018-08-30 7:06 ` Ruslan Kabatsayev
2018-08-30 8:12 ` Andrew Burgess
2018-08-30 15:11 ` Tom Tromey
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