http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56405
Bug #: 56405
Summary: [4.8 Regression] ICE on questionable "m" argument
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: inline-asm
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ja...@gcc.gnu.org
Target: arm-linux-gnueabi
void
foo (void)
{
asm volatile ("" : "+m" (*(volatile unsigned short *) 0x100001UL));
}
ICEs on arm at -O2 or -Os starting I think with:
2012-03-16 Martin Jambor <mjam...@suse.cz>
* expr.c (expand_expr_real_1): Handle misaligned scalar reads from
memory through MEM_REFs by calling extract_bit_field.
stmt.c is unprepared, when it requests EXPAND_MEMORY, not to get a MEM, but REG
instead.
I wonder whether the kernel code is just a bug in this case, or if it can
actually work properly, especially on strict alignment targets.
