Add TCG native negation op.

[qemu] / target-cris / translate.c

diff --git a/target-cris/translate.c b/target-cris/translate.c
index 89a0533..9551ea1 100644 (file)
--- a/target-cris/translate.c
+++ b/target-cris/translate.c
@@ -318,7 +318,7 @@ static void t_gen_lz_i32(TCGv d, TCGv x)
 
        /* y = -(x >> 16)  */
        tcg_gen_shri_i32(y, x, 16);
-       tcg_gen_sub_i32(y, tcg_const_i32(0), y);
+       tcg_gen_neg_i32(y, y);
 
        /* m = (y >> 16) & 16  */
        tcg_gen_sari_i32(m, y, 16);
@@ -753,9 +753,9 @@ static void crisv32_alu_op(DisasContext *dc, int op, int rd, int size)
                        t_gen_add_flag(cpu_T[0], 8); /* R_FLAG.  */
                        break;
                case CC_OP_SUB:
-                       tcg_gen_sub_tl(cpu_T[1], tcg_const_tl(0), cpu_T[1]);
+                       tcg_gen_neg_tl(cpu_T[1], cpu_T[1]);
                        tcg_gen_add_tl(cpu_T[0], cpu_T[0], cpu_T[1]);
-                       tcg_gen_sub_tl(cpu_T[1], tcg_const_tl(0), cpu_T[1]);
+                       tcg_gen_neg_tl(cpu_T[1], cpu_T[1]);
                        /* CRIS flag evaluation needs ~src.  */
                        tcg_gen_xori_tl(cpu_T[1], cpu_T[1], -1);
 
@@ -784,9 +784,7 @@ static void crisv32_alu_op(DisasContext *dc, int op, int rd, int size)
                        t_gen_asr(cpu_T[0], cpu_T[0], cpu_T[1]);
                        break;
                case CC_OP_NEG:
-                       /* Hopefully the TCG backend recognizes this pattern
-                          and makes a real neg out of it.  */
-                       tcg_gen_sub_tl(cpu_T[0], tcg_const_tl(0), cpu_T[1]);
+                       tcg_gen_neg_tl(cpu_T[0], cpu_T[1]);
                        /* Extended arithmetics.  */
                        t_gen_subx_carry(cpu_T[0]);
                        break;
@@ -829,10 +827,10 @@ static void crisv32_alu_op(DisasContext *dc, int op, int rd, int size)
                }
                break;
                case CC_OP_CMP:
-                       tcg_gen_sub_tl(cpu_T[1], tcg_const_tl(0), cpu_T[1]);
+                       tcg_gen_neg_tl(cpu_T[1], cpu_T[1]);
                        tcg_gen_add_tl(cpu_T[0], cpu_T[0], cpu_T[1]);
                        /* CRIS flag evaluation needs ~src.  */
-                       tcg_gen_sub_tl(cpu_T[1], tcg_const_tl(0), cpu_T[1]);
+                       tcg_gen_neg_tl(cpu_T[1], cpu_T[1]);
                        /* CRIS flag evaluation needs ~src.  */
                        tcg_gen_xori_tl(cpu_T[1], cpu_T[1], -1);
 
@@ -1642,7 +1640,7 @@ static unsigned int dec_abs_r(DisasContext *dc)
        /* TODO: consider a branch free approach.  */
        l1 = gen_new_label();
        tcg_gen_brcond_tl(TCG_COND_GE, cpu_T[1], tcg_const_tl(0), l1);
-       tcg_gen_sub_tl(cpu_T[1], tcg_const_tl(0), cpu_T[1]);
+       tcg_gen_neg_tl(cpu_T[1], cpu_T[1]);
        gen_set_label(l1);
        crisv32_alu_op(dc, CC_OP_MOVE, dc->op2, 4);
        return 2;