From 0dc221b200b9d3df550e2d760cb396e4cb5f7176 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Sat, 20 Aug 2022 08:44:27 -0400
Subject: submodule LuaJIT; build libs through Makefile
---
lib/LuaJIT/src/lj_opt_dce.c | 78 ---------------------------------------------
1 file changed, 78 deletions(-)
delete mode 100644 lib/LuaJIT/src/lj_opt_dce.c
(limited to 'lib/LuaJIT/src/lj_opt_dce.c')
diff --git a/lib/LuaJIT/src/lj_opt_dce.c b/lib/LuaJIT/src/lj_opt_dce.c
deleted file mode 100644
index 2417f32..0000000
--- a/lib/LuaJIT/src/lj_opt_dce.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/*
-** DCE: Dead Code Elimination. Pre-LOOP only -- ASM already performs DCE.
-** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
-*/
-
-#define lj_opt_dce_c
-#define LUA_CORE
-
-#include "lj_obj.h"
-
-#if LJ_HASJIT
-
-#include "lj_ir.h"
-#include "lj_jit.h"
-#include "lj_iropt.h"
-
-/* Some local macros to save typing. Undef'd at the end. */
-#define IR(ref) (&J->cur.ir[(ref)])
-
-/* Scan through all snapshots and mark all referenced instructions. */
-static void dce_marksnap(jit_State *J)
-{
- SnapNo i, nsnap = J->cur.nsnap;
- for (i = 0; i < nsnap; i++) {
- SnapShot *snap = &J->cur.snap[i];
- SnapEntry *map = &J->cur.snapmap[snap->mapofs];
- MSize n, nent = snap->nent;
- for (n = 0; n < nent; n++) {
- IRRef ref = snap_ref(map[n]);
- if (ref >= REF_FIRST)
- irt_setmark(IR(ref)->t);
- }
- }
-}
-
-/* Backwards propagate marks. Replace unused instructions with NOPs. */
-static void dce_propagate(jit_State *J)
-{
- IRRef1 *pchain[IR__MAX];
- IRRef ins;
- uint32_t i;
- for (i = 0; i < IR__MAX; i++) pchain[i] = &J->chain[i];
- for (ins = J->cur.nins-1; ins >= REF_FIRST; ins--) {
- IRIns *ir = IR(ins);
- if (irt_ismarked(ir->t)) {
- irt_clearmark(ir->t);
- pchain[ir->o] = &ir->prev;
- } else if (!ir_sideeff(ir)) {
- *pchain[ir->o] = ir->prev; /* Reroute original instruction chain. */
- ir->t.irt = IRT_NIL;
- ir->o = IR_NOP; /* Replace instruction with NOP. */
- ir->op1 = ir->op2 = 0;
- ir->prev = 0;
- continue;
- }
- if (ir->op1 >= REF_FIRST) irt_setmark(IR(ir->op1)->t);
- if (ir->op2 >= REF_FIRST) irt_setmark(IR(ir->op2)->t);
- }
-}
-
-/* Dead Code Elimination.
-**
-** First backpropagate marks for all used instructions. Then replace
-** the unused ones with a NOP. Note that compressing the IR to eliminate
-** the NOPs does not pay off.
-*/
-void lj_opt_dce(jit_State *J)
-{
- if ((J->flags & JIT_F_OPT_DCE)) {
- dce_marksnap(J);
- dce_propagate(J);
- memset(J->bpropcache, 0, sizeof(J->bpropcache)); /* Invalidate cache. */
- }
-}
-
-#undef IR
-
-#endif
--
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