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Re: [PATCH v5 24/60] target/riscv: vector single-width averaging add and
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From: |
Richard Henderson |
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Subject: |
Re: [PATCH v5 24/60] target/riscv: vector single-width averaging add and subtract |
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Date: |
Sat, 14 Mar 2020 01:25:12 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 |
On 3/14/20 1:14 AM, Richard Henderson wrote:
> I think you should have 4 versions of aadd8, for each of the rounding modes,
>
>> +RVVCALL(OPIVV2_ENV, vaadd_vv_b, OP_SSS_B, H1, H1, H1, aadd8)
>
> then use this, or something like it, to define 4 functions containing main
> loops, which will get the helper above inlined.
Alternately, a set of inlines, where a (constant) vxrm is passed down from
above.
> Then use a final outermost wrapper to select one of the 4 functions based on
> env->vxrm.
The outermost wrapper could look like
switch (env->vxrm) {
case 0: somefunc(some, args, 0); break;
case 1: somefunc(some, args, 1); break;
case 2: somefunc(some, args, 2); break;
default: somefunc(some, args, 3); break;
}
so that somefunc (and its subroutines) are expanded with a constant, and we
switch on that constant at the outermost level.
r~
- [PATCH v5 20/60] target/riscv: vector single-width integer multiply-add instructions, (continued)
- [PATCH v5 20/60] target/riscv: vector single-width integer multiply-add instructions, LIU Zhiwei, 2020/03/12
- [PATCH v5 21/60] target/riscv: vector widening integer multiply-add instructions, LIU Zhiwei, 2020/03/12
- [PATCH v5 22/60] target/riscv: vector integer merge and move instructions, LIU Zhiwei, 2020/03/12
- [PATCH v5 23/60] target/riscv: vector single-width saturating add and subtract, LIU Zhiwei, 2020/03/12
- [PATCH v5 24/60] target/riscv: vector single-width averaging add and subtract, LIU Zhiwei, 2020/03/12
[PATCH v5 25/60] target/riscv: vector single-width fractional multiply with rounding and saturation, LIU Zhiwei, 2020/03/12
[PATCH v5 26/60] target/riscv: vector widening saturating scaled multiply-add, LIU Zhiwei, 2020/03/12
[PATCH v5 27/60] target/riscv: vector single-width scaling shift instructions, LIU Zhiwei, 2020/03/12