From 25bab8b1fb2fc851ea3f1f630b3de65ca6afdc22 Mon Sep 17 00:00:00 2001
From: Ash Wolf <ninji@wuffs.org>
Date: Wed, 14 Dec 2022 00:16:59 +0000
Subject: haha it's been a while since i last committed, hasn't it

---
 compiler_and_linker/unsorted/LoadDeletion.c | 46 +++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

(limited to 'compiler_and_linker/unsorted/LoadDeletion.c')

diff --git a/compiler_and_linker/unsorted/LoadDeletion.c b/compiler_and_linker/unsorted/LoadDeletion.c
index e69de29..316e8c2 100644
--- a/compiler_and_linker/unsorted/LoadDeletion.c
+++ b/compiler_and_linker/unsorted/LoadDeletion.c
@@ -0,0 +1,46 @@
+#include "compiler/LoadDeletion.h"
+#include "compiler/CopyPropagation.h"
+#include "compiler/CParser.h"
+#include "compiler/PCode.h"
+#include "compiler/PCodeInfo.h"
+
+int deletedloads;
+
+static int is_load(PCode *instr) {
+    return
+        (instr->op == PC_LI || instr->op == PC_VSPLTISB || instr->op == PC_VSPLTISH || instr->op == PC_VSPLTISW)
+        &&
+        instr->args[0].data.reg.reg >= n_real_registers[(char) instr->args[0].arg];
+}
+
+static int loadpropagatestouse(int candidateID, int useID) {
+    return 0;
+}
+
+static void deleteload(int id) {
+    Candidate *candidate;
+
+    candidate = Candidates + id;
+    if (candidate->list || (candidate->pcode->flags & fSideEffects))
+        return;
+    if (candidate->pcode->args[0].data.reg.reg < n_real_registers[(char) candidate->pcode->args[0].arg])
+        return;
+
+    deletepcode(candidate->pcode);
+    deletedloads = 1;
+}
+
+static Propagation load_immediate_prop = {
+    &is_load,
+    &loadpropagatestouse,
+    &deleteload,
+    "LOAD IMMEDIATE",
+    "LOAD_IMMEDIATES",
+    "l%ld",
+    0
+};
+
+void deletedeadloads(Object *proc) {
+    propagateinstructions(proc, &load_immediate_prop, (copts.optimizationlevel >= 4) ? 4 : 1, 0);
+    deletedloads = propagated_instructions;
+}
-- 
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