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Re: [Qemu-devel] [PATCH 09/21] target-mips: redefine Integer Multiply an
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [PATCH 09/21] target-mips: redefine Integer Multiply and Divide instructions |
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Date: |
Fri, 30 May 2014 09:57:44 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
On 05/30/2014 07:47 AM, Leon Alrae wrote:
> + case R6_OPC_MUL:
> + {
> + TCGv_i32 t2 = tcg_temp_new_i32();
> + TCGv_i32 t3 = tcg_temp_new_i32();
> + tcg_gen_trunc_tl_i32(t2, t0);
> + tcg_gen_trunc_tl_i32(t3, t1);
> + tcg_gen_muls2_i32(t2, t3, t2, t3);
Use tcg_gen_mul_i32, since you discard the high part.
Same with all of the other low-part multiplies.
r~
- [Qemu-devel] [PATCH 06/21] target-mips: split decode_opc_special* into *_r6 and *_legacy, (continued)
- [Qemu-devel] [PATCH 06/21] target-mips: split decode_opc_special* into *_r6 and *_legacy, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 07/21] target-mips: signal RI Exception on DSP and Loongson instructions, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 11/21] target-mips: Status.UX/SX/KX enable 32-bit address wrapping, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 10/21] target-mips: move CLO, DCLO, CLZ, DCLZ, SDBBP and free special2 in R6, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 09/21] target-mips: redefine Integer Multiply and Divide instructions, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 12/21] target-mips: add ALIGN, DALIGN, BITSWAP and DBITSWAP instructions, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 18/21] target-mips: do not allow Status.FR=0 mode in 64-bit FPU, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 13/21] target-mips: add Compact Branches, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 14/21] target-mips: add Addressing and PC-relative instructions, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 16/21] target-mips: add new Floating Point instructions, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 15/21] softfloat: add functions corresponding to IEEE-2008 min/maxNumMag, Leon Alrae, 2014/05/30
- [Qemu-devel] [PATCH 19/21] target-mips: remove JR, BLTZAL, BGEZAL and add NAL, BAL instructions, Leon Alrae, 2014/05/30