| // Copyright 2010 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" |
| |
| // func Log10(x float64) float64 |
| TEXT ·Log10(SB),NOSPLIT,$0 |
| FLDLG2 // F0=log10(2) |
| FMOVD x+0(FP), F0 // F0=x, F1=log10(2) |
| FYL2X // F0=log10(x)=log2(x)*log10(2) |
| FMOVDP F0, ret+8(FP) |
| RET |
| |
| // func Log2(x float64) float64 |
| TEXT ·Log2(SB),NOSPLIT,$0 |
| FLD1 // F0=1 |
| FMOVD x+0(FP), F0 // F0=x, F1=1 |
| FYL2X // F0=log2(x) |
| FMOVDP F0, ret+8(FP) |
| RET |
