* Optimize assume(...) away?
@ 2013-10-08 12:46 Dmitry Antipov
0 siblings, 0 replies; only message in thread
From: Dmitry Antipov @ 2013-10-08 12:46 UTC (permalink / raw)
To: Emacs development discussions; +Cc: Paul Eggert
Did someone _really_ check that assume(...) is always optimized away when
ENABLE_CHECKING is not defined? I'm looking at set_iterator_to_next and see:
xdisp.c:
...
eassert (IT_BYTEPOS (*it) == CHAR_TO_BYTE (IT_CHARPOS (*it)));
...
xdisp.i:
...
((((*it).current.pos).bytepos == (buf_charpos_to_bytepos (current_buffer, ((*it).current.pos).charpos))) ? (void) 0 : __builtin_unreachable ());
...
xdisp.s (-fverbose-asm):
...
.L4055:
.loc 1 7186 0
testb $16, 2466(%rbx) #, *it_23(D)
.loc 1 7184 0
movslq 2144(%rbx), %rax # it_23(D)->len,
.loc 1 7186 0
jne .L4072 #,
.loc 1 7188 0
addq %rax, 336(%rbx) # D.129872, it_23(D)->current.pos.bytepos
.loc 1 7189 0
movq 328(%rbx), %rax # it_23(D)->current.pos.charpos, tmp348
leaq 1(%rax), %rsi #, D.129872
.LVL4320:
movq %rsi, 328(%rbx) # D.129872, it_23(D)->current.pos.charpos
.L4073:
.loc 1 7212 0
movq current_buffer(%rip), %rdi # current_buffer,
call buf_charpos_to_bytepos # ;; OOPS
Stock Fedora19 gcc 4.8.1, -O2 -g3 -fverbose-asm.
Dmitry
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2013-10-08 12:46 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-10-08 12:46 Optimize assume(...) away? Dmitry Antipov
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.