Test code:
typedef enum { false, true } bool __attribute__((mode (byte)));
bool foo[16];
bool test (int i)
{
return foo[i];
}
This works with v3.3.3. With V4.0.0, the generated code is wrong -- it
references the array element as a word (4 bytes) yet indexes it as bytes. In
this particular test case, the generated code does unaligned loads (why is not
clear); in an example in my application where the bool array is on the stack, it
generated a regular word load, killing the program due to an unaligned access.
Presumably related: when I ask gdb what it thinks sizeof(foo[0]) is, I get 4
rather than the expected 1.
--
Summary: Wrong code generated for array of enum with "mode"
attribute
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pkoning at equallogic dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i386-unknown-netbsdelf1.6.2
GCC host triplet: i386-unknown-netbsdelf1.6.2
GCC target triplet: mipsel-netbsdelf
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21392
