all: drop 387 support

My last 387 CL. So sad ... ... ... ... not!

Fixes #40255

Change-Id: I8d4ddb744b234b8adc735db2f7c3c7b6d8bbdfa4
Reviewed-on: https://go-review.googlesource.com/c/go/+/258957
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

7 files changed, 0 insertions, 84 deletions

diff --git a/src/cmd/dist/build.go b/src/cmd/dist/build.go
index 3ac742fa55..5d62c1e8fa 100644
--- a/src/cmd/dist/build.go
+++ b/src/cmd/dist/build.go
@@ -30,7 +30,6 @@ var (
 	gohostos         string
 	goos             string
 	goarm            string
-	go386            string
 	gomips           string
 	gomips64         string
 	goppc64          string
@@ -142,16 +141,6 @@ func xinit() {
 	}
 	goarm = b
 
-	b = os.Getenv("GO386")
-	if b == "" {
-		if cansse2() {
-			b = "sse2"
-		} else {
-			b = "387"
-		}
-	}
-	go386 = b
-
 	b = os.Getenv("GOMIPS")
 	if b == "" {
 		b = "hardfloat"
@@ -223,7 +212,6 @@ func xinit() {
 	defaultldso = os.Getenv("GO_LDSO")
 
 	// For tools being invoked but also for os.ExpandEnv.
-	os.Setenv("GO386", go386)
 	os.Setenv("GOARCH", goarch)
 	os.Setenv("GOARM", goarm)
 	os.Setenv("GOHOSTARCH", gohostarch)
@@ -1165,9 +1153,6 @@ func cmdenv() {
 	if goarch == "arm" {
 		xprintf(format, "GOARM", goarm)
 	}
-	if goarch == "386" {
-		xprintf(format, "GO386", go386)
-	}
 	if goarch == "mips" || goarch == "mipsle" {
 		xprintf(format, "GOMIPS", gomips)
 	}
diff --git a/src/cmd/dist/buildruntime.go b/src/cmd/dist/buildruntime.go
index 2744951597..67d1d72db4 100644
--- a/src/cmd/dist/buildruntime.go
+++ b/src/cmd/dist/buildruntime.go
@@ -41,7 +41,6 @@ func mkzversion(dir, file string) {
 //	package objabi
 //
 //	const defaultGOROOT = <goroot>
-//	const defaultGO386 = <go386>
 //	const defaultGOARM = <goarm>
 //	const defaultGOMIPS = <gomips>
 //	const defaultGOMIPS64 = <gomips64>
@@ -70,7 +69,6 @@ func mkzbootstrap(file string) {
 	fmt.Fprintln(&buf)
 	fmt.Fprintf(&buf, "import \"runtime\"\n")
 	fmt.Fprintln(&buf)
-	fmt.Fprintf(&buf, "const defaultGO386 = `%s`\n", go386)
 	fmt.Fprintf(&buf, "const defaultGOARM = `%s`\n", goarm)
 	fmt.Fprintf(&buf, "const defaultGOMIPS = `%s`\n", gomips)
 	fmt.Fprintf(&buf, "const defaultGOMIPS64 = `%s`\n", gomips64)
diff --git a/src/cmd/dist/cpuid_386.s b/src/cmd/dist/cpuid_386.s
deleted file mode 100644
index 65fbb2dcb7..0000000000
--- a/src/cmd/dist/cpuid_386.s
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2015 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 !gccgo
-
-TEXT ·cpuid(SB),$0-8
-	MOVL ax+4(FP), AX
-	CPUID
-	MOVL info+0(FP), DI
-	MOVL AX, 0(DI)
-	MOVL BX, 4(DI)
-	MOVL CX, 8(DI)
-	MOVL DX, 12(DI)
-	RET
-
diff --git a/src/cmd/dist/cpuid_amd64.s b/src/cmd/dist/cpuid_amd64.s
deleted file mode 100644
index ea0b9d4dc9..0000000000
--- a/src/cmd/dist/cpuid_amd64.s
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2015 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 !gccgo
-
-TEXT ·cpuid(SB),$0-12
-	MOVL ax+8(FP), AX
-	CPUID
-	MOVQ info+0(FP), DI
-	MOVL AX, 0(DI)
-	MOVL BX, 4(DI)
-	MOVL CX, 8(DI)
-	MOVL DX, 12(DI)
-	RET
-
diff --git a/src/cmd/dist/cpuid_default.s b/src/cmd/dist/cpuid_default.s
deleted file mode 100644
index 6412a507a9..0000000000
--- a/src/cmd/dist/cpuid_default.s
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright 2015 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 !386,!amd64,!gccgo
-
-#include "textflag.h"
-
-TEXT ·cpuid(SB),NOSPLIT,$0-0
-	RET
diff --git a/src/cmd/dist/util_gc.go b/src/cmd/dist/util_gc.go
index 698beef704..17a0e6fbb5 100644
--- a/src/cmd/dist/util_gc.go
+++ b/src/cmd/dist/util_gc.go
@@ -6,18 +6,6 @@
 
 package main
 
-func cpuid(info *[4]uint32, ax uint32)
-
-func cansse2() bool {
-	if gohostarch != "386" && gohostarch != "amd64" {
-		return false
-	}
-
-	var info [4]uint32
-	cpuid(&info, 1)
-	return info[3]&(1<<26) != 0 // SSE2
-}
-
 // useVFPv1 tries to execute one VFPv1 instruction on ARM.
 // It will crash the current process if VFPv1 is missing.
 func useVFPv1()
diff --git a/src/cmd/dist/util_gccgo.go b/src/cmd/dist/util_gccgo.go
index f9f01dc048..dc897236fb 100644
--- a/src/cmd/dist/util_gccgo.go
+++ b/src/cmd/dist/util_gccgo.go
@@ -6,19 +6,6 @@
 
 package main
 
-/*
-int supports_sse2() {
-#if defined(__i386__) || defined(__x86_64__)
-	return __builtin_cpu_supports("sse2");
-#else
-	return 0;
-#endif
-}
-*/
-import "C"
-
-func cansse2() bool { return C.supports_sse2() != 0 }
-
 func useVFPv1() {}
 
 func useVFPv3() {}