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target-ppc: Implement neg in terms of subf 

Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
master
Richard Henderson 2013-02-19 23:52:18 -08:00 committed by Blue Swirl
parent b5a73f8d8a
commit fd3f0081e5
1 changed files with 19 additions and 44 deletions
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63
target-ppc/translate.c
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@ -1121,50 +1121,6 @@ static void gen_mulldo(DisasContext *ctx)
}
#endif
/* neg neg. nego nego. */
static inline void gen_op_arith_neg(DisasContext *ctx, TCGv ret, TCGv arg1,
int ov_check)
{
int l1 = gen_new_label();
int l2 = gen_new_label();
TCGv t0 = tcg_temp_local_new();
#if defined(TARGET_PPC64)
if (ctx->sf_mode) {
tcg_gen_mov_tl(t0, arg1);
tcg_gen_brcondi_tl(TCG_COND_EQ, t0, INT64_MIN, l1);
} else
#endif
{
tcg_gen_ext32s_tl(t0, arg1);
tcg_gen_brcondi_tl(TCG_COND_EQ, t0, INT32_MIN, l1);
}
tcg_gen_neg_tl(ret, arg1);
if (ov_check) {
tcg_gen_movi_tl(cpu_ov, 0);
}
tcg_gen_br(l2);
gen_set_label(l1);
tcg_gen_mov_tl(ret, t0);
if (ov_check) {
tcg_gen_movi_tl(cpu_ov, 1);
tcg_gen_movi_tl(cpu_so, 1);
}
gen_set_label(l2);
tcg_temp_free(t0);
if (unlikely(Rc(ctx->opcode) != 0))
gen_set_Rc0(ctx, ret);
}
static void gen_neg(DisasContext *ctx)
{
gen_op_arith_neg(ctx, cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)], 0);
}
static void gen_nego(DisasContext *ctx)
{
gen_op_arith_neg(ctx, cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)], 1);
}
/* Common subf function */
static inline void gen_op_arith_subf(DisasContext *ctx, TCGv ret, TCGv arg1,
TCGv arg2, bool add_ca, bool compute_ca,
@ -1254,6 +1210,25 @@ static void gen_subfic(DisasContext *ctx)
tcg_temp_free(c);
}
/* neg neg. nego nego. */
static inline void gen_op_arith_neg(DisasContext *ctx, bool compute_ov)
{
TCGv zero = tcg_const_tl(0);
gen_op_arith_subf(ctx, cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)],
zero, 0, 0, compute_ov, Rc(ctx->opcode));
tcg_temp_free(zero);
}
static void gen_neg(DisasContext *ctx)
{
gen_op_arith_neg(ctx, 0);
}
static void gen_nego(DisasContext *ctx)
{
gen_op_arith_neg(ctx, 1);
}
/*** Integer logical ***/
#define GEN_LOGICAL2(name, tcg_op, opc, type) \
static void glue(gen_, name)(DisasContext *ctx) \