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FP8 ACLE specification #323

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merged 2 commits into from
Sep 23, 2024
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momchil-velikov
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name: Pull request
about: Technical issues, document format problems, bugs in scripts or feature proposal.


Thank you for submitting a pull request!

If this PR is about a bugfix:

Please use the bugfix label and make sure to go through the checklist below.

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make it part of the Arm C Language Extension (ACLE) specifications.

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@andrewcarlotti
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I'd prefer slightly different naming for the intrinsics and new types. Specifically:

  1. Can we call the new types floatm8_t, floatm8x16_t, svfloatm8_t, etc.? This would be more consistent with existing type names while still preserving the "modal" distinction. It also makes the type name more easily distinguishable from FPMR values (which use fpm_t).

  2. Can we drop the _fpm suffix from all the intrinsic names, and instead represent the modality in the type suffix (by replacing _f8 with _fm8 wherever it appears)?

Combining these, my proposal is to replace, for example,
float16x4_t vdot_lane_f16_f8_fpm(float16x4_t vd, fpm8x8_t vn, fpm8x8_t vm, __builtin_constant_p(lane), fpm_t fpm)
with
float16x4_t vdot_lane_f16_fm8(float16x4_t vd, floatm8x8_t vn, floatm8x8_t vm, __builtin_constant_p(lane), fpm_t fpm).

@momchil-velikov
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  1. Can we call the new types floatm8_t, floatm8x16_t, svfloatm8_t, etc.?
  2. Can we drop the _fpm suffix from all the intrinsic names, and instead represent the modality in the type suffix (by replacing _f8 with _fm8 wherever it appears)?

I am in favour of both proposals.

@rsandifo-arm
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This might have been mentioned already, but the new vector types should also be added to svset_neonq, svget_neonq and svdup_neonq.

CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Jul 1, 2024
ARM ACLE PR#323[1] adds new modal types for 8-bit floating point intrinsic.

From the PR#323:
```
ACLE defines the `__fpm8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the FPMR.

This patch is an attempt to the add the fpm8_t scalar type.
It has a parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format.
But maybe we should add another opaque type.

[1]  ARM-software/acle#323
@momchil-velikov
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  1. Can we call the new types floatm8_t, floatm8x16_t, svfloatm8_t, etc.?
  2. Can we drop the _fpm suffix from all the intrinsic names, and instead represent the modality in the type suffix (by replacing _f8 with _fm8 wherever it appears)?

I am in favour of both proposals.

Coming up Soon(tm).

@momchil-velikov
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This might have been mentioned already, but the new vector types should also be added to svset_neonq, svget_neonq and svdup_neonq.

My next step is to add intrinsics for the untyped SVE/SME instructions, that would include these too.

CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Jul 22, 2024
This patch adds these new vector sizes for neon:
fpm8x16_t and fpm8x8_t

According to the ARM ACLE PR#323[1].

[1] ARM-software/acle#323
@momchil-velikov
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I'd prefer slightly different naming for the intrinsics and new types. Specifically:

  1. Can we call the new types floatm8_t, floatm8x16_t, svfloatm8_t, etc.? This would be more consistent with existing type names while still preserving the "modal" distinction. It also makes the type name more easily distinguishable from FPMR values (which use fpm_t).

This part done.

main/acle.md Outdated Show resolved Hide resolved
@paulwalker-arm
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  1. Can we call the new types floatm8_t, floatm8x16_t, svfloatm8_t, etc.? This would be more consistent with existing type names while still preserving the "modal" distinction. It also makes the type name more easily distinguishable from FPMR values (which use fpm_t).

As an amendment that follows the scheme used when going from float16 -> bfloat16 what about mfloat8_t, mfloat8x16_t, svmfloat8_t with "m" meaning "modal"?

@momchil-velikov
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momchil-velikov commented Jul 30, 2024

Things renamed according to the above naming scheme.

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The new feature macros should also be listed in the “Summary of predefined macros” section.

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CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Jul 31, 2024
 `mfloat8_t`     | equivalent to `__mfp8` |

According to ACLE[1] proposal
[1] ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Jul 31, 2024
 `mfloat8_t`     | equivalent to `__mfp8` |

According to ACLE[1] proposal
[1] ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Jul 31, 2024
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Jul 31, 2024
and fpm8x16_t to mfloat8x16_t

According to the ACLE[1]

[1]ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Aug 2, 2024
ARM ACLE PR#323[1] adds new modal types for 8-bit floating point intrinsic.

From the PR#323:
```
ACLE defines the `__mfp8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
 `mfloat8_t`     | equivalent to `__mfp8` |
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the FPMR.

This patch is an attempt to the add the fpm8_t scalar type.
It has a parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format.
But maybe we should add another opaque type.

According to ACLE[1] proposal
[1] ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Aug 2, 2024
This patch adds these new vector sizes for neon:
mfloat8x16_t and mfloat8x8_t

According to the ARM ACLE PR#323[1].

[1] ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Aug 2, 2024
This patch adds these new vector sizes for sve:
svmfloat8_t

According to the ARM ACLE PR#323[1].

[1] ARM-software/acle#323
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Thank you Momchil for the work.

tools/intrinsic_db/advsimd.csv Outdated Show resolved Hide resolved
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Sep 21, 2024
ARM ACLE PR#323[1] adds new modal types for 8-bit floating point intrinsic.

From the PR#323:
```
ACLE defines the `__mfp8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the FPMR.

This patch is an attempt to the add the MFloat8_t scalar type.
It has a parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format.
But maybe we should add another opaque type.

[1]  ARM-software/acle#323
@vhscampos vhscampos merged commit 5525258 into ARM-software:main Sep 23, 2024
4 checks passed
@@ -6515,7 +6714,7 @@ single vectors:

| **Signed integer** | **Unsigned integer** | **Floating-point** | |
| -------------------- | -------------------- | -------------------- | -------------------- |
| `svint8_t` | `svuint8_t` | | |
| `svint8_t` | `svuint8_t` | | `svmfloat8_t |
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Should the

svbfloat16_t is only available if the header file also provides a definition of bfloat16_t

section below be repeated or extended for svmfloat8_t?

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Wouldn't that be necessary only if the underlying type definition was conditional?

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It would, I was confused, thanks for clarifying :)

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minor suggestions

Comment on lines +5904 to +5905
The FP8 types are all opaque types. That is to say they can only be used
by intrinsics.
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That is to say they can only be used by intrinsics.

Change to: That is, they can only be used by intrinsics.


#### FCVTNT, FCVTNB

Single-precision convert, narrow and interleave to 8-bit floating-point (top and bottom).
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comma after 'narrow'

Lukacma added a commit to llvm/llvm-project that referenced this pull request Sep 25, 2024
This patch implements these intrinsics:

FSCALE SINGLE AND MULTI
``` 
  // Variants are also available for:
  // [_single_f32_x2], [_single_f64_x2],
  // [_single_f16_x4], [_single_f32_x4], [_single_f64_x4]
  svfloat16x2_t svscale[_single_f16_x2](svfloat16x2_t zd, svfloat16_t zm) __arm_streaming;

  // Variants are also available for:
  //  [_f32_x2], [_f64_x2],
  //  [_f16_x4], [_f32_x4], [_f64_x4]
  svfloat16x2_t svscale[_f16_x2](svfloat16x2_t zd, svfloat16x2_t zm) __arm_streaming

```
(cf. ARM-software/acle#323)

Co-authored-by: Caroline Concatto <[email protected]>
Lukacma added a commit to llvm/llvm-project that referenced this pull request Sep 26, 2024
This patch implements following intrinsics:

```
float16x4_t vscale_f16(float16x4_t vn, int16x4_t vm)	
float16x8_t vscaleq_f16(float16x8_t vn, int16x8_t vm)
float32x2_t vscale_f32(float32x2_t vn, int32x2_t vm)
float32x4_t vscaleq_f32(float32x4_t vn, int32x4_t vm)
float64x2_t vscaleq_f64(float64x2_t vn, int64x2_t vm)
```

as defined in ARM-software/acle#323

Co-authored-by: Hassnaa Hamdi <[email protected]>
augusto2112 pushed a commit to augusto2112/llvm-project that referenced this pull request Sep 26, 2024
This patch implements these intrinsics:

FSCALE SINGLE AND MULTI
``` 
  // Variants are also available for:
  // [_single_f32_x2], [_single_f64_x2],
  // [_single_f16_x4], [_single_f32_x4], [_single_f64_x4]
  svfloat16x2_t svscale[_single_f16_x2](svfloat16x2_t zd, svfloat16_t zm) __arm_streaming;

  // Variants are also available for:
  //  [_f32_x2], [_f64_x2],
  //  [_f16_x4], [_f32_x4], [_f64_x4]
  svfloat16x2_t svscale[_f16_x2](svfloat16x2_t zd, svfloat16x2_t zm) __arm_streaming

```
(cf. ARM-software/acle#323)

Co-authored-by: Caroline Concatto <[email protected]>
augusto2112 pushed a commit to augusto2112/llvm-project that referenced this pull request Sep 26, 2024
This patch implements following intrinsics:

```
float16x4_t vscale_f16(float16x4_t vn, int16x4_t vm)	
float16x8_t vscaleq_f16(float16x8_t vn, int16x8_t vm)
float32x2_t vscale_f32(float32x2_t vn, int32x2_t vm)
float32x4_t vscaleq_f32(float32x4_t vn, int32x4_t vm)
float64x2_t vscaleq_f64(float64x2_t vn, int64x2_t vm)
```

as defined in ARM-software/acle#323

Co-authored-by: Hassnaa Hamdi <[email protected]>
Sterling-Augustine pushed a commit to Sterling-Augustine/llvm-project that referenced this pull request Sep 27, 2024
This patch implements following intrinsics:

```
float16x4_t vscale_f16(float16x4_t vn, int16x4_t vm)	
float16x8_t vscaleq_f16(float16x8_t vn, int16x8_t vm)
float32x2_t vscale_f32(float32x2_t vn, int32x2_t vm)
float32x4_t vscaleq_f32(float32x4_t vn, int32x4_t vm)
float64x2_t vscaleq_f64(float64x2_t vn, int64x2_t vm)
```

as defined in ARM-software/acle#323

Co-authored-by: Hassnaa Hamdi <[email protected]>
puja2196 pushed a commit to puja2196/LLVM-tutorial that referenced this pull request Sep 30, 2024
This patch implements following intrinsics:

```
float16x4_t vscale_f16(float16x4_t vn, int16x4_t vm)	
float16x8_t vscaleq_f16(float16x8_t vn, int16x8_t vm)
float32x2_t vscale_f32(float32x2_t vn, int32x2_t vm)
float32x4_t vscaleq_f32(float32x4_t vn, int32x4_t vm)
float64x2_t vscaleq_f64(float64x2_t vn, int64x2_t vm)
```

as defined in ARM-software/acle#323

Co-authored-by: Hassnaa Hamdi <[email protected]>
puja2196 pushed a commit to puja2196/LLVM-tutorial that referenced this pull request Oct 2, 2024
This patch implements following intrinsics:

```
float16x4_t vscale_f16(float16x4_t vn, int16x4_t vm)	
float16x8_t vscaleq_f16(float16x8_t vn, int16x8_t vm)
float32x2_t vscale_f32(float32x2_t vn, int32x2_t vm)
float32x4_t vscaleq_f32(float32x4_t vn, int32x4_t vm)
float64x2_t vscaleq_f64(float64x2_t vn, int64x2_t vm)
```

as defined in ARM-software/acle#323

Co-authored-by: Hassnaa Hamdi <[email protected]>
xgupta pushed a commit to xgupta/llvm-project that referenced this pull request Oct 4, 2024
This patch implements these intrinsics:

FSCALE SINGLE AND MULTI
``` 
  // Variants are also available for:
  // [_single_f32_x2], [_single_f64_x2],
  // [_single_f16_x4], [_single_f32_x4], [_single_f64_x4]
  svfloat16x2_t svscale[_single_f16_x2](svfloat16x2_t zd, svfloat16_t zm) __arm_streaming;

  // Variants are also available for:
  //  [_f32_x2], [_f64_x2],
  //  [_f16_x4], [_f32_x4], [_f64_x4]
  svfloat16x2_t svscale[_f16_x2](svfloat16x2_t zd, svfloat16x2_t zm) __arm_streaming

```
(cf. ARM-software/acle#323)

Co-authored-by: Caroline Concatto <[email protected]>
xgupta pushed a commit to xgupta/llvm-project that referenced this pull request Oct 4, 2024
This patch implements following intrinsics:

```
float16x4_t vscale_f16(float16x4_t vn, int16x4_t vm)	
float16x8_t vscaleq_f16(float16x8_t vn, int16x8_t vm)
float32x2_t vscale_f32(float32x2_t vn, int32x2_t vm)
float32x4_t vscaleq_f32(float32x4_t vn, int32x4_t vm)
float64x2_t vscaleq_f64(float64x2_t vn, int64x2_t vm)
```

as defined in ARM-software/acle#323

Co-authored-by: Hassnaa Hamdi <[email protected]>
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Oct 9, 2024
This patch adds these new vector sizes for sve:
svmfloat8_t

According to the ARM ACLE PR#323[1].

[1] ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Oct 9, 2024
This patch adds these new vector sizes for sve:
svmfloat8_t

According to the ARM ACLE PR#323[1].

[1] ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Oct 14, 2024
ARM ACLE PR#323[1] adds new modal types for 8-bit floating point intrinsic.

From the PR#323:
```
ACLE defines the `__mfp8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the FPMR.

This patch is an attempt to the add the MFloat8_t scalar type.
It has a parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format.
But maybe we should add another opaque type.

[1]  ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Oct 14, 2024
This patch adds these new vector sizes for neon:
mfloat8x16_t and mfloat8x8_t

According to the ARM ACLE PR#323[1].

 `mfloat8_t`     | equivalent to `__mfp8` |

[1]ARM-software/acle#323
CarolineConcatto added a commit to llvm/llvm-project that referenced this pull request Oct 17, 2024
This patch adds these new vector sizes for sve:
    svmfloat8_t

According to the ARM ACLE PR#323[1].

[1] ARM-software/acle#323
bricknerb pushed a commit to bricknerb/llvm-project that referenced this pull request Oct 17, 2024
This patch adds these new vector sizes for sve:
    svmfloat8_t

According to the ARM ACLE PR#323[1].

[1] ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Oct 22, 2024
ARM ACLE PR#323[1] adds new modal types for 8-bit floating point intrinsic.

From the PR#323:
```
ACLE defines the `__mfp8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the FPMR.

This patch is an attempt to the add the MFloat8_t scalar type.
It has a parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format.
But maybe we should add another opaque type.

[1]  ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Oct 22, 2024
This patch adds these new vector sizes for neon:
mfloat8x16_t and mfloat8x8_t

According to the ARM ACLE PR#323[1].

 `mfloat8_t`     | equivalent to `__mfp8` |

[1]ARM-software/acle#323
EricWF pushed a commit to efcs/llvm-project that referenced this pull request Oct 22, 2024
This patch adds these new vector sizes for sve:
    svmfloat8_t

According to the ARM ACLE PR#323[1].

[1] ARM-software/acle#323
CarolineConcatto added a commit to llvm/llvm-project that referenced this pull request Oct 23, 2024
This patch adds these new vector sizes for neon:
   mfloat8x16_t and mfloat8x8_t

    According to the ARM ACLE PR#323[1].

    [1] ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Oct 23, 2024
ARM ACLE PR#323[1] adds new modal types for 8-bit floating point intrinsic.

From the PR#323:
```
ACLE defines the `__mfp8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the FPMR.

This patch is an attempt to the add the MFloat8_t scalar type.
It has a parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format.
But maybe we should add another opaque type.

[1]  ARM-software/acle#323
CarolineConcatto added a commit to CarolineConcatto/llvm-project that referenced this pull request Oct 24, 2024
ARM ACLE PR#323[1] adds new modal types for 8-bit floating point intrinsic.

From the PR#323:
```
ACLE defines the `__mfp8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the FPMR.

This patch is an attempt to the add the MFloat8_t scalar type.
It has a parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format.
But maybe we should add another opaque type.

[1]  ARM-software/acle#323
CarolineConcatto added a commit to llvm/llvm-project that referenced this pull request Oct 25, 2024
ARM ACLE PR#323[1] adds new modal types for 8-bit floating point
intrinsic.

From the PR#323:
```
ACLE defines the `__mfp8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the
FPMR.

This patch is an attempt to the add the mfloat8_t scalar type. It has a
parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format. But
maybe we should add another opaque type.

[1]  ARM-software/acle#323
NoumanAmir657 pushed a commit to NoumanAmir657/llvm-project that referenced this pull request Nov 4, 2024
This patch adds these new vector sizes for neon:
   mfloat8x16_t and mfloat8x8_t

    According to the ARM ACLE PR#323[1].

    [1] ARM-software/acle#323
NoumanAmir657 pushed a commit to NoumanAmir657/llvm-project that referenced this pull request Nov 4, 2024
…#97277)

ARM ACLE PR#323[1] adds new modal types for 8-bit floating point
intrinsic.

From the PR#323:
```
ACLE defines the `__mfp8` type, which can be used for the E5M2 and E4M3
8-bit floating-point formats. It is a storage and interchange only type
with no arithmetic operations other than intrinsic calls.
````

The type should be an opaque type and its format in undefined in Clang.
Only defined in the backend by a status/format register, for AArch64 the
FPMR.

This patch is an attempt to the add the mfloat8_t scalar type. It has a
parser and codegen for the new scalar type.

The patch it is lowering to and 8bit unsigned as it has no format. But
maybe we should add another opaque type.

[1]  ARM-software/acle#323
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