| // Copyright 2020 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| #include "textflag.h" |
| |
| // Values returned from an FCLASS instruction. |
| #define NegInf 0x001 |
| #define PosInf 0x080 |
| #define NaN 0x200 |
| |
| // func Max(x, y float64) float64 |
| TEXT ·Max(SB),NOSPLIT,$0 |
| MOVD x+0(FP), F0 |
| MOVD y+8(FP), F1 |
| FCLASSD F0, X5 |
| FCLASSD F1, X6 |
| |
| // +Inf special cases |
| MOV $PosInf, X7 |
| BEQ X7, X5, isMaxX |
| BEQ X7, X6, isMaxY |
| |
| // NaN special cases |
| MOV $NaN, X7 |
| BEQ X7, X5, isMaxX |
| BEQ X7, X6, isMaxY |
| |
| // normal case |
| FMAXD F0, F1, F0 |
| MOVD F0, ret+16(FP) |
| RET |
| |
| isMaxX: // return x |
| MOVD F0, ret+16(FP) |
| RET |
| |
| isMaxY: // return y |
| MOVD F1, ret+16(FP) |
| RET |
| |
| // func Min(x, y float64) float64 |
| TEXT ·Min(SB),NOSPLIT,$0 |
| MOVD x+0(FP), F0 |
| MOVD y+8(FP), F1 |
| FCLASSD F0, X5 |
| FCLASSD F1, X6 |
| |
| // -Inf special cases |
| MOV $NegInf, X7 |
| BEQ X7, X5, isMinX |
| BEQ X7, X6, isMinY |
| |
| // NaN special cases |
| MOV $NaN, X7 |
| BEQ X7, X5, isMinX |
| BEQ X7, X6, isMinY |
| |
| // normal case |
| FMIND F0, F1, F0 |
| MOVD F0, ret+16(FP) |
| RET |
| |
| isMinX: // return x |
| MOVD F0, ret+16(FP) |
| RET |
| |
| isMinY: // return y |
| MOVD F1, ret+16(FP) |
| RET |
