diff options
Diffstat (limited to 'tcg/optimize.c')
| -rw-r--r-- | tcg/optimize.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/tcg/optimize.c b/tcg/optimize.c index 090efbc193..973d2d679f 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -484,7 +484,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, TCGArg *args, TCGOpDef *tcg_op_defs) { int i, nb_ops, op_index, nb_temps, nb_globals, nb_call_args; - tcg_target_ulong mask; + tcg_target_ulong mask, affected; TCGOpcode op; const TCGOpDef *def; TCGArg *gen_args; @@ -629,6 +629,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, /* Simplify using known-zero bits */ mask = -1; + affected = -1; switch (op) { CASE_OP_32_64(ext8s): if ((temps[args[1]].mask & 0x80) != 0) { @@ -656,7 +657,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, mask = temps[args[2]].mask; if (temps[args[2]].state == TCG_TEMP_CONST) { and_const: - ; + affected = temps[args[1]].mask & ~mask; } mask = temps[args[1]].mask & mask; break; @@ -708,6 +709,31 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, break; } + if (mask == 0) { + assert(def->nb_oargs == 1); + s->gen_opc_buf[op_index] = op_to_movi(op); + tcg_opt_gen_movi(gen_args, args[0], 0); + args += def->nb_oargs + def->nb_iargs + def->nb_cargs; + gen_args += 2; + continue; + } + if (affected == 0) { + assert(def->nb_oargs == 1); + if (temps_are_copies(args[0], args[1])) { + s->gen_opc_buf[op_index] = INDEX_op_nop; + } else if (temps[args[1]].state != TCG_TEMP_CONST) { + s->gen_opc_buf[op_index] = op_to_mov(op); + tcg_opt_gen_mov(s, gen_args, args[0], args[1]); + gen_args += 2; + } else { + s->gen_opc_buf[op_index] = op_to_movi(op); + tcg_opt_gen_movi(gen_args, args[0], temps[args[1]].val); + gen_args += 2; + } + args += def->nb_iargs + 1; + continue; + } + /* Simplify expression for "op r, a, 0 => movi r, 0" cases */ switch (op) { CASE_OP_32_64(and): |