sam/libqbe
1
0
Fork 0
Code Issues Pull requests Projects Releases 1 Packages Wiki Activity Actions

make sure eflags-writing do not disappear

Browse source 
This is a hack implementation, ideally I would like
something cleaner.  The problem is that regalloc thinks
an instruction is dead code because it's not aware that
it writes to eflags.
This commit is contained in:
Quentin Carbonneaux 2015-08-15 20:49:20 -04:00
parent abbe53285f
commit bccfc34ca3
2 changed files with 6 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

5
lisc/isel.c
View file

@ -318,8 +318,11 @@ seljmp(Blk *b, Fn *fn)
selcmp(fi->arg, fn);
*fi = (Ins){ONop, R, {R, R}};
}
} else
} else {
if (fn->tmp[r.val].nuse == 1)
emit(OCopy, R, r, R);
b->jmp.type = JXJc + Cne;
}
} else {
selcmp((Ref[2]){r, CON_Z}, fn);
b->jmp.type = JXJc + Cne;