mirror of https://go.googlesource.com/go
28 lines
794 B
ArmAsm
28 lines
794 B
ArmAsm
// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// riscv64 allows 32-bit floats to live in the bottom
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// part of the register, it expects them to be NaN-boxed.
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// These functions are needed to ensure correct conversions
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// on riscv64.
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// Convert float32->uint64
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TEXT ·archFloat32ToReg(SB),NOSPLIT,$0-16
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MOVF val+0(FP), F1
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MOVD F1, ret+8(FP)
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RET
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// Convert uint64->float32
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TEXT ·archFloat32FromReg(SB),NOSPLIT,$0-12
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// Normally a float64->float32 conversion
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// would need rounding, but riscv64 store valid
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// float32 in the lower 32 bits, thus we only need to
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// unboxed the NaN-box by store a float32.
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MOVD reg+0(FP), F1
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MOVF F1, ret+8(FP)
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RET
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