math, math/big: add wasm architecture

This commit adds the wasm architecture to the math package.

Updates #18892

Change-Id: I5cc38552a31b193d35fb81ae87600a76b8b9e9b5
Reviewed-on: https://go-review.googlesource.com/106996Reviewed-by: Cherry Zhang <cherryyz@google.com>

src/math/big/arith_wasm.s

+// Copyright 2018 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.
+
+// +build !math_big_pure_go
+
+#include "textflag.h"
+
+TEXT ·mulWW(SB),NOSPLIT,$0
+	JMP ·mulWW_g(SB)
+
+TEXT ·divWW(SB),NOSPLIT,$0
+	JMP ·divWW_g(SB)
+
+TEXT ·addVV(SB),NOSPLIT,$0
+	JMP ·addVV_g(SB)
+
+TEXT ·subVV(SB),NOSPLIT,$0
+	JMP ·subVV_g(SB)
+
+TEXT ·addVW(SB),NOSPLIT,$0
+	JMP ·addVW_g(SB)
+
+TEXT ·subVW(SB),NOSPLIT,$0
+	JMP ·subVW_g(SB)
+
+TEXT ·shlVU(SB),NOSPLIT,$0
+	JMP ·shlVU_g(SB)
+
+TEXT ·shrVU(SB),NOSPLIT,$0
+	JMP ·shrVU_g(SB)
+
+TEXT ·mulAddVWW(SB),NOSPLIT,$0
+	JMP ·mulAddVWW_g(SB)
+
+TEXT ·addMulVVW(SB),NOSPLIT,$0
+	JMP ·addMulVVW_g(SB)
+
+TEXT ·divWVW(SB),NOSPLIT,$0
+	JMP ·divWVW_g(SB)

src/math/floor_wasm.s

+// Copyright 2018 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"
+
+TEXT ·Floor(SB),NOSPLIT,$0
+	Get SP
+	F64Load x+0(FP)
+	F64Floor
+	F64Store ret+8(FP)
+	RET
+
+TEXT ·Ceil(SB),NOSPLIT,$0
+	Get SP
+	F64Load x+0(FP)
+	F64Ceil
+	F64Store ret+8(FP)
+	RET
+
+TEXT ·Trunc(SB),NOSPLIT,$0
+	Get SP
+	F64Load x+0(FP)
+	F64Trunc
+	F64Store ret+8(FP)
+	RET

src/math/sqrt_wasm.s

+// Copyright 2018 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"
+
+TEXT ·Sqrt(SB),NOSPLIT,$0
+	Get SP
+	F64Load x+0(FP)
+	F64Sqrt
+	F64Store ret+8(FP)
+	RET

src/math/stubs_wasm.s

+// Copyright 2018 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"
+
+TEXT ·Asin(SB),NOSPLIT,$0
+	JMP ·asin(SB)
+
+TEXT ·Asinh(SB),NOSPLIT,$0
+	JMP ·asinh(SB)
+
+TEXT ·Acos(SB),NOSPLIT,$0
+	JMP ·acos(SB)
+
+TEXT ·Acosh(SB),NOSPLIT,$0
+	JMP ·acosh(SB)
+
+TEXT ·Atan(SB),NOSPLIT,$0
+	JMP ·atan(SB)
+
+TEXT ·Atanh(SB),NOSPLIT,$0
+	JMP ·atanh(SB)
+
+TEXT ·Atan2(SB),NOSPLIT,$0
+	JMP ·atan2(SB)
+
+TEXT ·Cbrt(SB),NOSPLIT,$0
+	JMP ·cbrt(SB)
+
+TEXT ·Cos(SB),NOSPLIT,$0
+	JMP ·cos(SB)
+
+TEXT ·Cosh(SB),NOSPLIT,$0
+	JMP ·cosh(SB)
+
+TEXT ·Erf(SB),NOSPLIT,$0
+	JMP ·erf(SB)
+
+TEXT ·Erfc(SB),NOSPLIT,$0
+	JMP ·erfc(SB)
+
+TEXT ·Exp(SB),NOSPLIT,$0
+	JMP ·exp(SB)
+
+TEXT ·Expm1(SB),NOSPLIT,$0
+	JMP ·expm1(SB)
+
+TEXT ·Exp2(SB),NOSPLIT,$0
+	JMP ·exp2(SB)
+
+TEXT ·Frexp(SB),NOSPLIT,$0
+	JMP ·frexp(SB)
+
+TEXT ·Hypot(SB),NOSPLIT,$0
+	JMP ·hypot(SB)
+
+TEXT ·Ldexp(SB),NOSPLIT,$0
+	JMP ·ldexp(SB)
+
+TEXT ·Log(SB),NOSPLIT,$0
+	JMP ·log(SB)
+
+TEXT ·Log1p(SB),NOSPLIT,$0
+	JMP ·log1p(SB)
+
+TEXT ·Log10(SB),NOSPLIT,$0
+	JMP ·log10(SB)
+
+TEXT ·Log2(SB),NOSPLIT,$0
+	JMP ·log2(SB)
+
+TEXT ·Max(SB),NOSPLIT,$0
+	JMP ·max(SB)
+
+TEXT ·Min(SB),NOSPLIT,$0
+	JMP ·min(SB)
+
+TEXT ·Mod(SB),NOSPLIT,$0
+	JMP ·mod(SB)
+
+TEXT ·Modf(SB),NOSPLIT,$0
+	JMP ·modf(SB)
+
+TEXT ·Pow(SB),NOSPLIT,$0
+	JMP ·pow(SB)
+
+TEXT ·Remainder(SB),NOSPLIT,$0
+	JMP ·remainder(SB)
+
+TEXT ·Sin(SB),NOSPLIT,$0
+	JMP ·sin(SB)
+
+TEXT ·Sinh(SB),NOSPLIT,$0
+	JMP ·sinh(SB)
+
+TEXT ·Tan(SB),NOSPLIT,$0
+	JMP ·tan(SB)
+
+TEXT ·Tanh(SB),NOSPLIT,$0
+	JMP ·tanh(SB)