float32reg_s390x.s

     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
    15  TEXT ·archFloat32ToReg(SB),NOSPLIT,$0-16
    16         FMOVS   val+0(FP), F1
    17         FMOVD   F1, ret+8(FP)
    18         RET
    19  
    20  // Convert uint64->float32
    21  TEXT ·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  
    31
View as plain text