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Add TCG native negation op.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4426 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2008-05-11 14:35:37 +00:00
parent 44cd42ee40
commit 390efc54fb
7 changed files with 50 additions and 16 deletions
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16
target-cris/translate.c
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@ -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;