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target-m68k: Optimize gen_flush_flags
Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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@ -458,18 +458,66 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
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static void gen_flush_flags(DisasContext *s)
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{
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TCGv tmp;
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TCGv t0, t1;
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switch (s->cc_op) {
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case CC_OP_FLAGS:
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return;
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case CC_OP_ADD:
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tcg_gen_mov_i32(QREG_CC_C, QREG_CC_X);
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tcg_gen_mov_i32(QREG_CC_Z, QREG_CC_N);
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/* Compute signed overflow for addition. */
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t0 = tcg_temp_new();
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t1 = tcg_temp_new();
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tcg_gen_sub_i32(t0, QREG_CC_N, QREG_CC_V);
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tcg_gen_xor_i32(t1, QREG_CC_N, QREG_CC_V);
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tcg_gen_xor_i32(QREG_CC_V, QREG_CC_V, t0);
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tcg_temp_free(t0);
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tcg_gen_andc_i32(QREG_CC_V, t1, QREG_CC_V);
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tcg_temp_free(t1);
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break;
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case CC_OP_SUB:
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tcg_gen_mov_i32(QREG_CC_C, QREG_CC_X);
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tcg_gen_mov_i32(QREG_CC_Z, QREG_CC_N);
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/* Compute signed overflow for subtraction. */
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t0 = tcg_temp_new();
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t1 = tcg_temp_new();
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tcg_gen_add_i32(t0, QREG_CC_N, QREG_CC_V);
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tcg_gen_xor_i32(t1, QREG_CC_N, QREG_CC_V);
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tcg_gen_xor_i32(QREG_CC_V, QREG_CC_V, t0);
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tcg_temp_free(t0);
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tcg_gen_and_i32(QREG_CC_V, QREG_CC_V, t1);
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tcg_temp_free(t1);
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break;
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case CC_OP_CMP:
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tcg_gen_setcond_i32(TCG_COND_LTU, QREG_CC_C, QREG_CC_N, QREG_CC_V);
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tcg_gen_sub_i32(QREG_CC_Z, QREG_CC_N, QREG_CC_V);
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/* Compute signed overflow for subtraction. */
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t0 = tcg_temp_new();
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tcg_gen_xor_i32(t0, QREG_CC_Z, QREG_CC_N);
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tcg_gen_xor_i32(QREG_CC_V, QREG_CC_V, QREG_CC_N);
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tcg_gen_and_i32(QREG_CC_V, QREG_CC_V, t0);
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tcg_temp_free(t0);
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tcg_gen_mov_i32(QREG_CC_N, QREG_CC_Z);
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break;
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case CC_OP_LOGIC:
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tcg_gen_mov_i32(QREG_CC_Z, QREG_CC_N);
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tcg_gen_movi_i32(QREG_CC_C, 0);
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tcg_gen_movi_i32(QREG_CC_V, 0);
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break;
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case CC_OP_DYNAMIC:
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gen_helper_flush_flags(cpu_env, QREG_CC_OP);
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break;
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default:
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tmp = tcg_const_i32(s->cc_op);
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gen_helper_flush_flags(cpu_env, tmp);
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tcg_temp_free(tmp);
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t0 = tcg_const_i32(s->cc_op);
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gen_helper_flush_flags(cpu_env, t0);
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tcg_temp_free(t0);
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break;
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}
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