float32reg_s390x.s

Documentation: reflect

     1// Copyright 2025 The Go Authors. All rights reserved.
     2// Use of this source code is governed by a BSD-style
     3// license that can be found in the LICENSE file.
     4
     5//go:build s390x
     6
     7#include "textflag.h"
     8
     9// On s390x, the float32 becomes a float64
    10// when loaded in a register, different from
    11// other platforms. These functions are
    12// needed to ensure correct conversions on s390x.
    13
    14// Convert float32->uint64
    15TEXT ·archFloat32ToReg(SB),NOSPLIT,$0-16
    16       FMOVS   val+0(FP), F1
    17       FMOVD   F1, ret+8(FP)
    18       RET
    19
    20// Convert uint64->float32
    21TEXT ·archFloat32FromReg(SB),NOSPLIT,$0-12
    22       FMOVD   reg+0(FP), F1
    23       // Normally a float64->float32 conversion
    24       // would need rounding, but that is not needed
    25       // here since the uint64 was originally converted
    26       // from float32, and should be avoided to
    27       // preserve SNaN values.
    28       FMOVS   F1, ret+8(FP)
    29       RET
    30
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