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target/ppc: Implement cnttzdm
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>
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@ -125,6 +125,7 @@ ADDPCIS 010011 ..... ..... .......... 00010 . @DX
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CFUGED 011111 ..... ..... ..... 0011011100 - @X
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CFUGED 011111 ..... ..... ..... 0011011100 - @X
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CNTLZDM 011111 ..... ..... ..... 0000111011 - @X
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CNTLZDM 011111 ..... ..... ..... 0000111011 - @X
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CNTTZDM 011111 ..... ..... ..... 1000111011 - @X
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### Float-Point Load Instructions
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### Float-Point Load Instructions
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@ -415,7 +415,7 @@ static bool trans_CFUGED(DisasContext *ctx, arg_X *a)
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}
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}
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#if defined(TARGET_PPC64)
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#if defined(TARGET_PPC64)
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static void do_cntlzdm(TCGv_i64 dst, TCGv_i64 src, TCGv_i64 mask)
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static void do_cntzdm(TCGv_i64 dst, TCGv_i64 src, TCGv_i64 mask, bool trail)
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{
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{
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TCGv_i64 tmp;
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TCGv_i64 tmp;
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TCGLabel *l1;
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TCGLabel *l1;
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@ -424,12 +424,20 @@ static void do_cntlzdm(TCGv_i64 dst, TCGv_i64 src, TCGv_i64 mask)
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l1 = gen_new_label();
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l1 = gen_new_label();
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tcg_gen_and_i64(tmp, src, mask);
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tcg_gen_and_i64(tmp, src, mask);
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tcg_gen_clzi_i64(tmp, tmp, 64);
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if (trail) {
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tcg_gen_ctzi_i64(tmp, tmp, 64);
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} else {
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tcg_gen_clzi_i64(tmp, tmp, 64);
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}
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tcg_gen_brcondi_i64(TCG_COND_EQ, tmp, 0, l1);
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tcg_gen_brcondi_i64(TCG_COND_EQ, tmp, 0, l1);
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tcg_gen_subfi_i64(tmp, 64, tmp);
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tcg_gen_subfi_i64(tmp, 64, tmp);
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tcg_gen_shr_i64(tmp, mask, tmp);
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if (trail) {
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tcg_gen_shl_i64(tmp, mask, tmp);
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} else {
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tcg_gen_shr_i64(tmp, mask, tmp);
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}
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tcg_gen_ctpop_i64(tmp, tmp);
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tcg_gen_ctpop_i64(tmp, tmp);
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gen_set_label(l1);
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gen_set_label(l1);
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@ -443,7 +451,19 @@ static bool trans_CNTLZDM(DisasContext *ctx, arg_X *a)
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REQUIRE_64BIT(ctx);
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REQUIRE_64BIT(ctx);
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REQUIRE_INSNS_FLAGS2(ctx, ISA310);
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REQUIRE_INSNS_FLAGS2(ctx, ISA310);
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#if defined(TARGET_PPC64)
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#if defined(TARGET_PPC64)
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do_cntlzdm(cpu_gpr[a->ra], cpu_gpr[a->rt], cpu_gpr[a->rb]);
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do_cntzdm(cpu_gpr[a->ra], cpu_gpr[a->rt], cpu_gpr[a->rb], false);
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#else
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qemu_build_not_reached();
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#endif
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return true;
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}
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static bool trans_CNTTZDM(DisasContext *ctx, arg_X *a)
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{
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REQUIRE_64BIT(ctx);
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REQUIRE_INSNS_FLAGS2(ctx, ISA310);
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#if defined(TARGET_PPC64)
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do_cntzdm(cpu_gpr[a->ra], cpu_gpr[a->rt], cpu_gpr[a->rb], true);
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#else
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#else
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qemu_build_not_reached();
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qemu_build_not_reached();
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#endif
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#endif
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