We recently tracked down an aliasing bug in gcc-4.4.3 (found by our
TILE-Gx back end, not yet ready to contribute), and we wanted to make
sure the fix is right.
try_crossjump_bb identifies some common insns in SPEC2000.eon and uses
merge_memattrs to merge them. To do so, it has to unify their
destructive merging.
-Mat
Steven Bosscher stevenb@gmail.com writes:
On Mon, Apr 12, 2010 at 6:57 PM, Mat Hostetter mhostet...@tilera.com wrote:
try_crossjump_bb identifies some common insns in SPEC2000.eon and uses
merge_memattrs to merge them. To do so, it has to unify their
aliasing
Adam Nemet adambne...@gmail.com writes:
I think the right fix is to call convert_to_mode or convert_move in the
expansion code which ensure the proper truncation.
That would yield correct code, but wouldn't it throw away the fact
that the high bits are already known to be zero, and
Adam Nemet adambne...@gmail.com writes:
Ian Lance Taylor i...@google.com writes:
Mat Hostetter mhostet...@tilera.com writes:
Since the high bits are already zero, that would be less efficient on
most platforms, so guarding it with something like this would probably
be smarter
I am porting gcc-4.4.3 to TILE-Gx, a 64-bit VLIW RISC. It's gone
pretty well so far; most tests work, Linux builds, etc. Thanks for
writing such good documentation.
This chip, like MIPS64, maintains the invariant that SImode values in
DImode registers are always sign-extended. So I have
