target/openrisc: Use dc->zero in gen_add, gen_addc

We still need the t0 temporary for computing overflow,
but we do not need to initialize it to zero first.

Reviewed-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/target/openrisc/translate.c b/target/openrisc/translate.c
index 6aba4c2..059da48 100644 (file)
--- a/target/openrisc/translate.c
+++ b/target/openrisc/translate.c
@@ -199,10 +199,10 @@ static void gen_ove_cyov(DisasContext *dc)
 
 static void gen_add(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
 {
-    TCGv t0 = tcg_const_tl(0);
+    TCGv t0 = tcg_temp_new();
     TCGv res = tcg_temp_new();
 
-    tcg_gen_add2_tl(res, cpu_sr_cy, srca, t0, srcb, t0);
+    tcg_gen_add2_tl(res, cpu_sr_cy, srca, dc->zero, srcb, dc->zero);
     tcg_gen_xor_tl(cpu_sr_ov, srca, srcb);
     tcg_gen_xor_tl(t0, res, srcb);
     tcg_gen_andc_tl(cpu_sr_ov, t0, cpu_sr_ov);
@@ -216,11 +216,11 @@ static void gen_add(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
 
 static void gen_addc(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
 {
-    TCGv t0 = tcg_const_tl(0);
+    TCGv t0 = tcg_temp_new();
     TCGv res = tcg_temp_new();
 
-    tcg_gen_add2_tl(res, cpu_sr_cy, srca, t0, cpu_sr_cy, t0);
-    tcg_gen_add2_tl(res, cpu_sr_cy, res, cpu_sr_cy, srcb, t0);
+    tcg_gen_add2_tl(res, cpu_sr_cy, srca, dc->zero, cpu_sr_cy, dc->zero);
+    tcg_gen_add2_tl(res, cpu_sr_cy, res, cpu_sr_cy, srcb, dc->zero);
     tcg_gen_xor_tl(cpu_sr_ov, srca, srcb);
     tcg_gen_xor_tl(t0, res, srcb);
     tcg_gen_andc_tl(cpu_sr_ov, t0, cpu_sr_ov);