1 files changed, 25 insertions, 0 deletions
diff --git a/src/math/frexp_386.s b/src/math/frexp_386.s
new file mode 100644
index 000000000..5bff7e215
--- /dev/null
+++ b/src/math/frexp_386.s
@@ -0,0 +1,25 @@
+// 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 Frexp(f float64) (frac float64, exp int)
+TEXT ·Frexp(SB),NOSPLIT,$0
+	FMOVD   f+0(FP), F0   // F0=f
+	FXAM
+	FSTSW   AX
+	SAHF
+	JNP     nan_zero_inf
+	JCS     nan_zero_inf
+	FXTRACT               // F0=f (0<=f<1), F1=e
+	FMULD  $(0.5), F0     // F0=f (0.5<=f<1), F1=e
+	FMOVDP  F0, frac+8(FP)   // F0=e
+	FLD1                  // F0=1, F1=e
+	FADDDP  F0, F1        // F0=e+1
+	FMOVLP  F0, exp+16(FP)  // (int=int32)
+	RET
+nan_zero_inf:
+	FMOVDP  F0, frac+8(FP)   // F0=e
+	MOVL    $0, exp+16(FP)  // exp=0
+	RET