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patch 8.2.3893: Vim9: many local variables are initialized with an instruction

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Problem:    Vim9: many local variables are initialized with an instruction.
Solution:   Initialize local variables to zero to avoid the instructions.
This commit is contained in:
Bram Moolenaar
2021-12-25 18:23:24 +00:00
parent 35cfd793aa
commit 5cd647935d
7 changed files with 51 additions and 23 deletions
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11
src/vim9compile.c
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@@ -1963,6 +1963,7 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
{
int instr_count = -1;
int save_lnum;
int skip_store = FALSE;
if (var_start[0] == '_' && !eval_isnamec(var_start[1]))
{
@@ -2186,7 +2187,12 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
case VAR_VOID:
case VAR_INSTR:
case VAR_SPECIAL: // cannot happen
generate_PUSHNR(cctx, 0);
// This is skipped for local variables, they are
// always initialized to zero.
if (lhs.lhs_dest == dest_local)
skip_store = TRUE;
else
generate_PUSHNR(cctx, 0);
break;
}
}
@@ -2278,7 +2284,8 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
// type of "val" is used.
generate_SETTYPE(cctx, lhs.lhs_type);
if (generate_store_lhs(cctx, &lhs, instr_count) == FAIL)
if (!skip_store && generate_store_lhs(cctx, &lhs,
instr_count, is_decl) == FAIL)
{
cctx->ctx_lnum = save_lnum;
goto theend;