Implement the following PowerISA v3.1 instruction:
cnttzdm: Count Trailing Zeros Doubleword Under Bit Mask
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <
20211029202424.175401-9-matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
CFUGED 011111 ..... ..... ..... 0011011100 - @X
CNTLZDM 011111 ..... ..... ..... 0000111011 - @X
CFUGED 011111 ..... ..... ..... 0011011100 - @X
CNTLZDM 011111 ..... ..... ..... 0000111011 - @X
+CNTTZDM 011111 ..... ..... ..... 1000111011 - @X
### Float-Point Load Instructions
### Float-Point Load Instructions
}
#if defined(TARGET_PPC64)
}
#if defined(TARGET_PPC64)
-static void do_cntlzdm(TCGv_i64 dst, TCGv_i64 src, TCGv_i64 mask)
+static void do_cntzdm(TCGv_i64 dst, TCGv_i64 src, TCGv_i64 mask, bool trail)
{
TCGv_i64 tmp;
TCGLabel *l1;
{
TCGv_i64 tmp;
TCGLabel *l1;
l1 = gen_new_label();
tcg_gen_and_i64(tmp, src, mask);
l1 = gen_new_label();
tcg_gen_and_i64(tmp, src, mask);
- tcg_gen_clzi_i64(tmp, tmp, 64);
+ if (trail) {
+ tcg_gen_ctzi_i64(tmp, tmp, 64);
+ } else {
+ tcg_gen_clzi_i64(tmp, tmp, 64);
+ }
tcg_gen_brcondi_i64(TCG_COND_EQ, tmp, 0, l1);
tcg_gen_subfi_i64(tmp, 64, tmp);
tcg_gen_brcondi_i64(TCG_COND_EQ, tmp, 0, l1);
tcg_gen_subfi_i64(tmp, 64, tmp);
- tcg_gen_shr_i64(tmp, mask, tmp);
+ if (trail) {
+ tcg_gen_shl_i64(tmp, mask, tmp);
+ } else {
+ tcg_gen_shr_i64(tmp, mask, tmp);
+ }
tcg_gen_ctpop_i64(tmp, tmp);
gen_set_label(l1);
tcg_gen_ctpop_i64(tmp, tmp);
gen_set_label(l1);
REQUIRE_64BIT(ctx);
REQUIRE_INSNS_FLAGS2(ctx, ISA310);
#if defined(TARGET_PPC64)
REQUIRE_64BIT(ctx);
REQUIRE_INSNS_FLAGS2(ctx, ISA310);
#if defined(TARGET_PPC64)
- do_cntlzdm(cpu_gpr[a->ra], cpu_gpr[a->rt], cpu_gpr[a->rb]);
+ do_cntzdm(cpu_gpr[a->ra], cpu_gpr[a->rt], cpu_gpr[a->rb], false);
+#else
+ qemu_build_not_reached();
+#endif
+ return true;
+}
+
+static bool trans_CNTTZDM(DisasContext *ctx, arg_X *a)
+{
+ REQUIRE_64BIT(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, ISA310);
+#if defined(TARGET_PPC64)
+ do_cntzdm(cpu_gpr[a->ra], cpu_gpr[a->rt], cpu_gpr[a->rb], true);
#else
qemu_build_not_reached();
#endif
#else
qemu_build_not_reached();
#endif