Pseudo-Minimum and Pseudo-Maximum instructions

Author: Maratyszcza

proposals/simd/BinarySIMD.md

@@ -202,3 +202,7 @@ The `v8x16.shuffle` instruction has 16 bytes after `simdop`.
 | `i8x16.abs`                |    `0xe1`| -                  |
 | `i16x8.abs`                |    `0xe2`| -                  |
 | `i32x4.abs`                |    `0xe3`| -                  |
+| `f32x4.pmin`               |    `0xdd`| -                  |
+| `f32x4.pmax`               |    `0xde`| -                  |
+| `f64x2.pmin`               |    `0xdf`| -                  |
+| `f64x2.pmax`               |    `0xe0`| -                  |

proposals/simd/SIMD.md

@@ -832,6 +832,18 @@ Lane-wise minimum value, propagating NaNs.
 
 Lane-wise maximum value, propagating NaNs.
 
+### Pseudo-minimum
+* `f32x4.pmin(a: v128, b: v128) -> v128`
+* `f64x2.pmin(a: v128, b: v128) -> v128`
+
+Lane-wise minimum value, defined as `b < a ? b : a`.
+
+### Pseudo-maximum
+* `f32x4.pmax(a: v128, b: v128) -> v128`
+* `f64x2.pmax(a: v128, b: v128) -> v128`
+
+Lane-wise maximum value, defined as `a < b ? b : a`.
+
 ## Floating-point arithmetic
 
 The floating-point arithmetic operations are all lane-wise versions of the