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From: "mirq-gccboogs at rere dot qmqm dot pl" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/43471] New: Unnecessary reload of asm "m" operand address Date: Sun, 21 Mar 2010 20:08:00 -0000 [thread overview] Message-ID: <bug-43471-18939@http.gcc.gnu.org/bugzilla/> (raw) code: register int *p asm("r4"); void a() { asm volatile("" : "+m" (*p)); } generates: [...] mov r3, r4 [...] when it should generate no move as the address register won't be modified inside asm(). Similar bugs: #40680, #34283, #13355. (gcc 4.5 from svn 157582) -- Summary: Unnecessary reload of asm "m" operand address Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: enhancement Priority: P3 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: mirq-gccboogs at rere dot qmqm dot pl GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: arm-none-eabi http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43471
next reply other threads:[~2010-03-21 20:08 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-03-21 20:08 mirq-gccboogs at rere dot qmqm dot pl [this message] 2010-03-22 23:05 ` [Bug rtl-optimization/43471] " ramana at gcc dot gnu dot org 2010-03-23 5:43 ` mirq-gccboogs at rere dot qmqm dot pl 2010-03-23 5:52 ` mirq-gccboogs at rere dot qmqm dot pl 2010-03-23 13:18 ` rearnsha at gcc dot gnu dot org 2010-03-23 14:04 ` mirq-gccboogs at rere dot qmqm dot pl 2010-04-15 21:51 ` kkojima at gcc dot gnu dot org
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