mirror of https://git.wuffs.org/MWCC
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
#include "compiler/LoadDeletion.h"
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#include "compiler/CopyPropagation.h"
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#include "compiler/CParser.h"
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#include "compiler/PCode.h"
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#include "compiler/PCodeInfo.h"
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#include "compiler/Registers.h"
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int deletedloads;
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static int is_load(PCode *instr) {
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return
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(instr->op == PC_LI || instr->op == PC_VSPLTISB || instr->op == PC_VSPLTISH || instr->op == PC_VSPLTISW)
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&&
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instr->args[0].data.reg.reg >= n_real_registers[instr->args[0].arg];
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}
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static int loadpropagatestouse(int candidateID, int useID) {
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return 0;
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}
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static void deleteload(int id) {
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Candidate *candidate;
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candidate = Candidates + id;
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if (candidate->list || (candidate->pcode->flags & fSideEffects))
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return;
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if (candidate->pcode->args[0].data.reg.reg < n_real_registers[candidate->pcode->args[0].arg])
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return;
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deletepcode(candidate->pcode);
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deletedloads = 1;
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}
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static Propagation load_immediate_prop = {
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&is_load,
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&loadpropagatestouse,
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&deleteload,
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"LOAD IMMEDIATE",
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"LOAD_IMMEDIATES",
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"l%" PRId32,
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0
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};
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void deletedeadloads(Object *proc) {
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propagateinstructions(proc, &load_immediate_prop, (copts.optimizationlevel >= 4) ? 4 : 1, 0);
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deletedloads = propagated_instructions;
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}
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