From: Xi Ruoyao <xry111@mengyan1223.wang>
To: Vishal Subramanyam <vishalsubramanyam@outlook.com>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Pure/const function not getting executed as the first operand to logical OR ( || ) (C++)
Date: Sun, 23 Jan 2022 18:02:46 +0800 [thread overview]
Message-ID: <f37cb8d54e546400e7c3b1fc3d2c9d716a24bd15.camel@mengyan1223.wang> (raw)
In-Reply-To: <MA1PR0101MB15596E34BCF3E684A1468974B55D9@MA1PR0101MB1559.INDPRD01.PROD.OUTLOOK.COM>
On Sun, 2022-01-23 at 09:56 +0000, Vishal Subramanyam wrote:
> This still doesn't explain why an O1 level optimization can violate
> the standard by not evaluating the first operand.
It's not violating the standard. The standard says division-by-zero is
an undefined behavior, so the compiler can do anything.
> What optimization is my code triggering with -fno-inline? My function
> clearly has a return value, so how did the compiler
> decide that the return value doesn't matter?
--
Xi Ruoyao <xry111@mengyan1223.wang>
School of Aerospace Science and Technology, Xidian University
next prev parent reply other threads:[~2022-01-23 10:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-23 8:37 Vishal Subramanyam
2022-01-23 9:12 ` Xi Ruoyao
[not found] ` <MA1PR0101MB15596E34BCF3E684A1468974B55D9@MA1PR0101MB1559.INDPRD01.PROD.OUTLOOK.COM>
2022-01-23 9:58 ` Fw: " Vishal Subramanyam
2022-01-23 10:02 ` Xi Ruoyao [this message]
2022-01-23 10:50 ` Vishal Subramanyam
2022-01-23 11:25 ` Marc Glisse
2022-01-23 12:24 ` Vishal Subramanyam
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