nik/lush
1
1
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Towards constant propagation

Browse Source 
This commit detaches the number of active variables from the
number of variables in the stack, during compilation. Soon,
compile-time constants will be propagated and therefore will
not exist during run time (in the stack).
This commit is contained in:
Roberto Ierusalimschy
2019-07-10 14:00:22 -03:00
parent 54f7b46c1e
commit 3d296304ef
3 changed files with 87 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
lcode.c
View File

@@ -458,7 +458,7 @@ void luaK_reserveregs (FuncState *fs, int n) {
)
*/
static void freereg (FuncState *fs, int reg) {
if (reg >= fs->nactvar) {
if (reg >= luaY_nvarstack(fs)) {
fs->freereg--;
lua_assert(reg == fs->freereg);
}
@@ -850,7 +850,7 @@ int luaK_exp2anyreg (FuncState *fs, expdesc *e) {
if (e->k == VNONRELOC) { /* expression already has a register? */
if (!hasjumps(e)) /* no jumps? */
return e->u.info; /* result is already in a register */
if (e->u.info >= fs->nactvar) { /* reg. is not a local? */
if (e->u.info >= luaY_nvarstack(fs)) { /* reg. is not a local? */
exp2reg(fs, e, e->u.info); /* put final result in it */
return e->u.info;
}