| // Copyright 2022 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" | |
| // riscv64 allows 32-bit floats to live in the bottom | |
| // part of the register, it expects them to be NaN-boxed. | |
| // These functions are needed to ensure correct conversions | |
| // on riscv64. | |
| // Convert float32->uint64 | |
| TEXT 路archFloat32ToReg(SB),NOSPLIT,$0-16 | |
| MOVF val+0(FP), F1 | |
| MOVD F1, ret+8(FP) | |
| RET | |
| // Convert uint64->float32 | |
| TEXT 路archFloat32FromReg(SB),NOSPLIT,$0-12 | |
| // Normally a float64->float32 conversion | |
| // would need rounding, but riscv64 store valid | |
| // float32 in the lower 32 bits, thus we only need to | |
| // unboxed the NaN-box by store a float32. | |
| MOVD reg+0(FP), F1 | |
| MOVF F1, ret+8(FP) | |
| RET | |