------- Comment #1 from rguenth at gcc dot gnu dot org 2010-04-08 15:11 -------
Well, we have not properly gimplified the invalid function:
doit ()
{
char * pk;
char * pk.1;
char * pk.0;
<bb 2>:
pk = 0B;
<bb 3>:
__asm__ __volatile__("nop"::"m" pk);
pk = pk + 1;
pk.0 = pk;
__asm__ __volatile__("nop"::"m" pk.0);
pk.1 = pk.0 + 1;
pk = pk.1;
goto <bb 3>;
pk is addressable, so pk + 1 needs to load from pk first.
3.4.x prints
t.i: In function `doit':
t.i:6: warning: use of memory input without lvalue in asm operand 0 is
deprecated
t.i:7: warning: use of memory input without lvalue in asm operand 0 is
deprecated
t.i:6: error: impossible constraint in `asm'
t.i:7: error: impossible constraint in `asm'
so we ICE on the invalid asm.
We also fail to diagnose this with newer compilers (but the gimple verifier
triggers with checking enabled).
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|c |middle-end
Ever Confirmed|0 |1
GCC build triplet|i486-linux-gnu |
GCC host triplet|i486-linux-gnu |
GCC target triplet|avr |
Keywords| |diagnostic, ice-on-invalid-
| |code
Known to fail| |4.1.2 4.3.4 4.4.4 4.5.0
| |4.6.0
Known to work| |3.4.6
Last reconfirmed|0000-00-00 00:00:00 |2010-04-08 15:11:43
date| |
Summary|Internal compiler error |[4.3/4.4/4.5 Regression]
|detected by avr-gcc. |Internal compiler error
| |detected by avr-gcc.
Target Milestone|--- |4.3.5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43690
