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Add Quasi-Fused Multiply-Add/Subtract instructions #79

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Add Quasi-Fused Multiply-Add/Subtract instructions #79

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4 changes: 4 additions & 0 deletions proposals/simd/BinarySIMD.md
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,8 @@ The `v8x16.shuffle` instruction has 16 bytes after `simdop`.
| `f32x4.abs` | `0x95`| - |
| `f32x4.neg` | `0x96`| - |
| `f32x4.sqrt` | `0x97`| - |
| `f32x4.qfma` | `0x98`| - |
| `f32x4.qfms` | `0x99`| - |
| `f32x4.add` | `0x9a`| - |
| `f32x4.sub` | `0x9b`| - |
| `f32x4.mul` | `0x9c`| - |
Expand All @@ -162,6 +164,8 @@ The `v8x16.shuffle` instruction has 16 bytes after `simdop`.
| `f64x2.abs` | `0xa0`| - |
| `f64x2.neg` | `0xa1`| - |
| `f64x2.sqrt` | `0xa2`| - |
| `f64x2.qfma` | `0xa3`| - |
| `f64x2.qfms` | `0xa4`| - |
| `f64x2.add` | `0xa5`| - |
| `f64x2.sub` | `0xa6`| - |
| `f64x2.mul` | `0xa7`| - |
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12 changes: 12 additions & 0 deletions proposals/simd/SIMD.md
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Expand Up @@ -867,6 +867,18 @@ Lane-wise IEEE `multiplication`.

Lane-wise IEEE `squareRoot`.

### Quasi-Fused Multiply-Add
* `f32x4.qfma(a: v128, b: v128, c: v128) -> v128`
* `f64x2.qfma(a: v128, b: v128, c: v128) -> v128`

Lane-wise multiplication and addition (`a + b * c`), either with, or without intermediate rounding. WebAssembly implementation may execute this instruction as either IEEE Fused-Multiply-Add (FMA) or a combination of IEEE `multiplication` and IEEE `addition` operations, depending on availability and performance of FMA instruction on the target native platform. `qfma` instructions in a WebAssembly module must execute as either all fused, or all unfused operations.

### Quasi-Fused Multiply-Subtract
* `f32x4.qfms(a: v128, b: v128, c: v128) -> v128`
* `f64x2.qfms(a: v128, b: v128, c: v128) -> v128`

Lane-wise multiplication and subtraction (`a - b * c`), either with, or without intermediate rounding. WebAssembly implementation may execute this instruction as either IEEE Fused-Multiply-Subtract (FMS) or a combination of IEEE `multiplication` and IEEE `subtraction` operations, depending on availability and performance of FMS instruction on the target native platform. `qfms` instructions in a WebAssembly module must execute as either all fused, or all unfused operations.

## Conversions
### Integer to floating point
* `f32x4.convert_i32x4_s(a: v128) -> v128`
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