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Re: [Qemu-devel] [PATCH v2 6/6] target/mips: Add emulation of MMI instru
From: |
Richard Henderson |
Subject: |
Re: [Qemu-devel] [PATCH v2 6/6] target/mips: Add emulation of MMI instruction PEXCW |
Date: |
Tue, 26 Feb 2019 09:14:02 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 |
On 2/26/19 4:23 AM, Mateja Marjanovic wrote:
> + } else if (rt == rd) {
> + TCGv_i64 t0 = tcg_temp_new();
> + TCGv_i64 t1 = tcg_temp_new();
> + uint64_t mask0 = (1ULL << 32) - 1;
> + uint64_t mask1 = mask0 << 32;
> +
> + tcg_gen_andi_i64(t0, cpu_gpr[rt], mask1);
> + tcg_gen_shri_i64(t0, t0, 32);
> + tcg_gen_andi_i64(t1, cpu_mmr[rt], mask0);
> + tcg_gen_shli_i64(t1, t1, 32);
> +
> + tcg_gen_and_i64(cpu_mmr[rd], cpu_mmr[rd], mask1);
> + tcg_gen_or_i64(cpu_mmr[rd], cpu_mmr[rd], t0);
> +
> + tcg_gen_and_i64(cpu_gpr[rd], cpu_gpr[rd], mask0);
> + tcg_gen_or_i64(cpu_gpr[rd], cpu_gpr[rd], t1);
> +
> + tcg_temp_free(t0);
> + tcg_temp_free(t1);
> + } else {
> + TCGv_i64 t0 = tcg_temp_new();
> + TCGv_i64 t1 = tcg_temp_new();
> + uint64_t mask0 = (1ULL << 32) - 1;
> + uint64_t mask1 = mask0 << 32;
> +
> + tcg_gen_andi_i64(t0, cpu_mmr[rt], mask1);
> + tcg_gen_andi_i64(t1, cpu_gpr[rt], mask1);
> + tcg_gen_shri_i64(t1, t1, 32);
> + tcg_gen_or_i64(cpu_mmr[rd], t0, t1);
> +
> + tcg_gen_andi_i64(t0, cpu_mmr[rt], mask0);
> + tcg_gen_shli_i64(t0, t0, 32);
> + tcg_gen_andi_i64(t1, cpu_gpr[rt], mask0);
> + tcg_gen_or_i64(cpu_gpr[rd], t0, t1);
> +
> + tcg_temp_free(t0);
> + tcg_temp_free(t1);
> + }
Likewise, why are you duplicating cases?
Also, this can be simplified with deposit:
tcg_gen_shri_i64(t0, cpu_gpr[rt], 32);
tcg_gen_deposit_i64(cpu_gpr[rd], cpu_gpr[rt], cpu_mmu[rt], 32, 32);
tcg_gen_deposit_i64(cpu_mmu[rd], cpu_mmu[rt], t0, 0, 32);
r~
- [Qemu-devel] [PATCH v2 0/6] target/mips: Add emulation of data communication MMI instructions, Mateja Marjanovic, 2019/02/26
- [Qemu-devel] [PATCH v2 4/6] target/mips: Add emulation of MMI instruction PCPYUD, Mateja Marjanovic, 2019/02/26
- [Qemu-devel] [PATCH v2 3/6] target/mips: Add emulation of MMI instruction PCPYLD, Mateja Marjanovic, 2019/02/26
- [Qemu-devel] [PATCH v2 6/6] target/mips: Add emulation of MMI instruction PEXCW, Mateja Marjanovic, 2019/02/26
- Re: [Qemu-devel] [PATCH v2 6/6] target/mips: Add emulation of MMI instruction PEXCW,
Richard Henderson <=
- [Qemu-devel] [PATCH v2 1/6] target/mips: Preparing for adding MMI instructions, Mateja Marjanovic, 2019/02/26
- [Qemu-devel] [PATCH v2 2/6] target/mips: Add emulation of MMI instruction PCPYH, Mateja Marjanovic, 2019/02/26
- [Qemu-devel] [PATCH v2 5/6] target/mips: Add emulation of MMI instruction PEXCH, Mateja Marjanovic, 2019/02/26