From 82be6e02b480b2c7427b0ab91f2c297717d3cfa6 Mon Sep 17 00:00:00 2001 From: Luis Pires Date: Fri, 29 Oct 2021 17:23:57 -0300 Subject: [PATCH] target/ppc: Implement cntlzdm Implement the following PowerISA v3.1 instruction: cntlzdm: Count Leading Zeros Doubleword Under Bit Mask Suggested-by: Richard Henderson Signed-off-by: Luis Pires Signed-off-by: Matheus Ferst Message-Id: <20211029202424.175401-8-matheus.ferst@eldorado.org.br> Reviewed-by: Richard Henderson Signed-off-by: David Gibson --- target/ppc/insn32.decode | 1 + target/ppc/translate/fixedpoint-impl.c.inc | 36 ++++++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode index 7ff8c25ac5..eb3383c99c 100644 --- a/target/ppc/insn32.decode +++ b/target/ppc/insn32.decode @@ -124,6 +124,7 @@ ADDPCIS 010011 ..... ..... .......... 00010 . @DX ## Fixed-Point Logical Instructions CFUGED 011111 ..... ..... ..... 0011011100 - @X +CNTLZDM 011111 ..... ..... ..... 0000111011 - @X ### Float-Point Load Instructions diff --git a/target/ppc/translate/fixedpoint-impl.c.inc b/target/ppc/translate/fixedpoint-impl.c.inc index 0d9c6e0996..c9e9ae35df 100644 --- a/target/ppc/translate/fixedpoint-impl.c.inc +++ b/target/ppc/translate/fixedpoint-impl.c.inc @@ -413,3 +413,39 @@ static bool trans_CFUGED(DisasContext *ctx, arg_X *a) #endif return true; } + +#if defined(TARGET_PPC64) +static void do_cntlzdm(TCGv_i64 dst, TCGv_i64 src, TCGv_i64 mask) +{ + TCGv_i64 tmp; + TCGLabel *l1; + + tmp = tcg_temp_local_new_i64(); + l1 = gen_new_label(); + + tcg_gen_and_i64(tmp, src, mask); + 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_shr_i64(tmp, mask, tmp); + tcg_gen_ctpop_i64(tmp, tmp); + + gen_set_label(l1); + + tcg_gen_mov_i64(dst, tmp); +} +#endif + +static bool trans_CNTLZDM(DisasContext *ctx, arg_X *a) +{ + 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]); +#else + qemu_build_not_reached(); +#endif + return true; +}