diff options
Diffstat (limited to 'src/math/dim_riscv64.s')
| -rw-r--r-- | src/math/dim_riscv64.s | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/math/dim_riscv64.s b/src/math/dim_riscv64.s new file mode 100644 index 0000000..38f5fe7 --- /dev/null +++ b/src/math/dim_riscv64.s @@ -0,0 +1,70 @@ +// 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 |