@nongnu.org; Programmingkid
; qemu-...@nongnu.org; Howard Spoelstra
; Alex Bennée
Oggetto: Re: R: R: About hardfloat in ppc
On Thu, 30 Apr 2020, 罗勇刚(Yonggang Luo) wrote:
> I propose a new way to computing the float flags, We preserve a float
> computing cash typedef struct FpRecord { uint
On Thu, 30 Apr 2020, 罗勇刚(Yonggang Luo) wrote:
I propose a new way to computing the float flags,
We preserve a float computing cash
typedef struct FpRecord {
uint8_t op;
float32 A;
float32 B;
} FpRecord;
FpRecord fp_cache[1024];
int fp_cache_length;
uint32_t fp_exceptions;
1. For each new fp
I propose a new way to computing the float flags,
We preserve a float computing cash
typedef struct FpRecord {
uint8_t op;
float32 A;
float32 B;
} FpRecord;
FpRecord fp_cache[1024];
int fp_cache_length;
uint32_t fp_exceptions;
1. For each new fp operation we push it to the fp_cache,
2. On
罗勇刚(Yonggang Luo) writes:
> On Thu, Apr 30, 2020 at 10:18 AM Richard Henderson <
> richard.hender...@linaro.org> wrote:
>
>> On 4/29/20 5:20 PM, 罗勇刚(Yonggang Luo) wrote:
>> > Question, in hard-float, if we don't want to read the fp register.
>> > for example: If we wanna compute c = a + b in fp
On Thu, Apr 30, 2020 at 10:18 AM Richard Henderson <
richard.hender...@linaro.org> wrote:
> On 4/29/20 5:20 PM, 罗勇刚(Yonggang Luo) wrote:
> > Question, in hard-float, if we don't want to read the fp register.
> > for example: If we wanna compute c = a + b in fp32
> > if c = a + b In hard float
> >
On 4/29/20 5:20 PM, 罗勇刚(Yonggang Luo) wrote:
> Question, in hard-float, if we don't want to read the fp register.
> for example: If we wanna compute c = a + b in fp32
> if c = a + b In hard float
> and if b1 = c - a in hard float
> if b1 != b at bitwise level, the we se the inexat to 1, otherwsie
Question, in hard-float, if we don't want to read the fp register.
for example: If we wanna compute c = a + b in fp32
if c = a + b In hard float
and if b1 = c - a in hard float
if b1 != b at bitwise level, the we se the inexat to 1, otherwsie
we set inexat bit to 0? are this valid?
we can also do
On Wed, Apr 29, 2020 at 7:57 PM Alex Bennée wrote:
>
> Dino Papararo writes:
>
> > Hello,
> > about handling of PPC fpu exceptions and Hard Floats support we could
> consider a different approach for different instructions.
> > i.e. not all fpu instructions take care about inexact or exceptions
Dino Papararo writes:
> Hi Alex,
>
> I leave to you TCG's experts how it works and how to implement it, I'm
> only tryng to explain a possible fast way to go (if ever possible) 😊
This is all a theoretical discussion unless someone cares enough to
improve the situation. While I have an interes
On Wed, 29 Apr 2020 at 15:33, Dino Papararo wrote:
>
> Hi Alex,
> maybe a pseudo code can show better what I mean
>
> if (ppc_fpu_instruction == USE_FPSCR) /* instruction have dot '.' so FPSCR
> will be updated and we need have care about it */
> soft_decode (ppc_fpu_instruction)
> else
..@nongnu.org; qemu-devel@nongnu.org
Oggetto: Re: R: About hardfloat in ppc
Dino Papararo writes:
> Hello,
> about handling of PPC fpu exceptions and Hard Floats support we could
> consider a different approach for different instructions.
> i.e. not all fpu instructions take care about ine
罗勇刚(Yonggang Luo) writes:
> On Wed, Apr 29, 2020 at 7:57 PM Alex Bennée wrote:
>
>>
>> Dino Papararo writes:
>>
>> > Hello,
>> > about handling of PPC fpu exceptions and Hard Floats support we could
>> consider a different approach for different instructions.
>> > i.e. not all fpu instruction
On Wed, Apr 29, 2020 at 7:57 PM Alex Bennée wrote:
>
> Dino Papararo writes:
>
> > Hello,
> > about handling of PPC fpu exceptions and Hard Floats support we could
> consider a different approach for different instructions.
> > i.e. not all fpu instructions take care about inexact or exceptions
Dino Papararo writes:
> Hello,
> about handling of PPC fpu exceptions and Hard Floats support we could
> consider a different approach for different instructions.
> i.e. not all fpu instructions take care about inexact or exceptions bits: if
> I take a simple fadd f0,f1,f2 I'll copy value der
an
; Mark Cave-Ayland ;
Programmingkid ; Howard Spoelstra
Cc: qemu-...@nongnu.org; qemu-devel@nongnu.org
Oggetto: R: About hardfloat in ppc
Hello,
about handling of PPC fpu exceptions and Hard Floats support we could consider
a different approach for different instructions.
i.e. not all fpu in
Hello,
about handling of PPC fpu exceptions and Hard Floats support we could consider
a different approach for different instructions.
i.e. not all fpu instructions take care about inexact or exceptions bits: if I
take a simple fadd f0,f1,f2 I'll copy value derived from adding f1+f2 into f1
regi
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