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
