i32x4.dot_i16x8_s instruction (#127)

* i32x4.dot_i16x8_s instruction

* Update proposals/simd/ImplementationStatus.md

Co-authored-by: Thomas Lively <7121787+tlively@users.noreply.github.com>

Co-authored-by: Thomas Lively <7121787+tlively@users.noreply.github.com>

Author: Maratyszcza

proposals/simd/BinarySIMD.md

@@ -181,6 +181,7 @@ For example, `ImmLaneIdx16` is a byte with values in the range 0-15 (inclusive).
 | `i32x4.min_u`              |    `0xb7`| -                  |
 | `i32x4.max_s`              |    `0xb8`| -                  |
 | `i32x4.max_u`              |    `0xb9`| -                  |
+| `i32x4.dot_i16x8_s`        |    `0xba`| -                  |
 | `i64x2.neg`                |    `0xc1`| -                  |
 | `i64x2.shl`                |    `0xcb`| -                  |
 | `i64x2.shr_s`              |    `0xcc`| -                  |

proposals/simd/ImplementationStatus.md

@@ -149,6 +149,7 @@
 | `i32x4.min_u`              |               `-msimd128` | :heavy_check_mark: |                    |                    | :heavy_check_mark: |
 | `i32x4.max_s`              |               `-msimd128` | :heavy_check_mark: |                    |                    | :heavy_check_mark: |
 | `i32x4.max_u`              |               `-msimd128` | :heavy_check_mark: |                    |                    | :heavy_check_mark: |
+| `i32x4.dot_i16x8_s`        |                           |                    |                    |                    |                    |
 | `i64x2.neg`                |               `-msimd128` | :heavy_check_mark: |                    |                    | :heavy_check_mark: |
 | `i64x2.shl`                |               `-msimd128` | :heavy_check_mark: |                    |                    | :heavy_check_mark: |
 | `i64x2.shr_s`              |               `-msimd128` | :heavy_check_mark: |                    |                    | :heavy_check_mark: |

proposals/simd/NewOpcodes.md

@@ -100,13 +100,13 @@
 | i8x16.sub            | 0x71   | i16x8.sub                | 0x91   | i32x4.sub                | 0xb1   | i64x2.sub   | 0xd1   |
 | i8x16.sub_sat_s      | 0x72   | i16x8.sub_sat_s          | 0x92   | ---- sub_sat ----        | 0xb2   | ----        | 0xd2   |
 | i8x16.sub_sat_u      | 0x73   | i16x8.sub_sat_u          | 0x93   | ---- sub_sat ----        | 0xb3   | ----        | 0xd3   |
-| ---- dot ----        | 0x74   | ---- dot ----            | 0x94   | ---- dot ----            | 0xb4   | ----        | 0xd4   |
+| -------------        | 0x74   | -------------            | 0x94   | -------------            | 0xb4   | ----        | 0xd4   |
 | ---- mul ----        | 0x75   | i16x8.mul                | 0x95   | i32x4.mul                | 0xb5   | i64x2.mul   | 0xd5   |
 | i8x16.min_s          | 0x76   | i16x8.min_s              | 0x96   | i32x4.min_s              | 0xb6   | ----        | 0xd6   |
 | i8x16.min_u          | 0x77   | i16x8.min_u              | 0x97   | i32x4.min_u              | 0xb7   | ----        | 0xd7   |
 | i8x16.max_s          | 0x78   | i16x8.max_s              | 0x98   | i32x4.max_s              | 0xb8   | ----        | 0xd8   |
 | i8x16.max_u          | 0x79   | i16x8.max_u              | 0x99   | i32x4.max_u              | 0xb9   | ----        | 0xd9   |
-| ---- avgr_s ----     | 0x7a   | ---- avgr_s ----         | 0x9a   | ---- avgr_s ----         | 0xba   | ----        | 0xda   |
+| ----------------     | 0x7a   | ----------------         | 0x9a   | i32x4.dot_i16x8_s        | 0xba   | ----        | 0xda   |
 | i8x16.avgr_u         | 0x7b   | i16x8.avgr_u             | 0x9b   | ---- avgr_u ----         | 0xbb   | ----        | 0xdb   |
 
 | f32x4 Op        | opcode | f64x2 Op        | opcode |

proposals/simd/SIMD.md

@@ -395,6 +395,11 @@ def S.mul(a, b):
     return S.lanewise_binary(mul, a, b)
 ```
 
+### Integer dot product
+* `i32x4.dot_i16x8_s(a: v128, b: v128) -> v128`
+
+Lane-wise multiply signed 16-bit integers in the two input vectors and add adjacent pairs of the full 32-bit results.
+
 ### Integer negation
 * `i8x16.neg(a: v128) -> v128`
 * `i16x8.neg(a: v128) -> v128`