// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package ssa

import (
	"cmd/compile/internal/base"
	"cmd/compile/internal/types"
	"cmd/internal/src"
	"sort"
)

// memcombine combines smaller loads and stores into larger ones.
// We ensure this generates good code for encoding/binary operations.
// It may help other cases also.
func memcombine(f *Func) {

	if *verbflag >= 3 {
		fmt.Printf("visit pk=%d fid=%d func %s\n", pkgIdx, fnIdx, fd.Funcname)
	}

	var counters []uint32
	key := pkfunc{pk: pkgIdx, fcn: fnIdx}
	v, haveCounters := mm.pod.pmm[key]
	if haveCounters {
		counters = v.Counters
	}

	if pcombine {
		// If the merge is running in "combine programs" mode, then hash

(MOVBUreg x:(ANDI [c] y)) && c >= 0 && int64(uint8(c)) == c => x
(MOVHUreg x:(ANDI [c] y)) && c >= 0 && int64(uint16(c)) == c => x
(MOVWUreg x:(ANDI [c] y)) && c >= 0 && int64(uint32(c)) == c => x

// Combine masking and zero extension.
(MOVBUreg (ANDI [c] x)) && c < 0 => (ANDI [int64(uint8(c))] x)
(MOVHUreg (ANDI [c] x)) && c < 0 => (ANDI [int64(uint16(c))] x)
(MOVWUreg (ANDI [c] x)) && c < 0 => (AND (MOVDconst [int64(uint32(c))]) x)

package walk

import (
	"fmt"
	"go/constant"
	"go/token"
	"math/bits"
	"sort"

	"cmd/compile/internal/base"
	"cmd/compile/internal/ir"
	"cmd/compile/internal/objw"
	"cmd/compile/internal/reflectdata"
	"cmd/compile/internal/rttype"
	"cmd/compile/internal/ssagen"
	"cmd/compile/internal/typecheck"
	"cmd/compile/internal/types"
	"cmd/internal/obj"
	"cmd/internal/src"
)

// walkSwitch walks a switch statement.

		but for the linker.
	CXX
		The command to use to compile C++ code.
	FC
		The command to use to compile Fortran code.
	PKG_CONFIG
		Path to pkg-config tool.

Architecture-specific environment variables:

	GOARM
		For GOARCH=arm, the ARM architecture for which to compile.
		Valid values are 5, 6, 7.

	"sort"
	"strings"
	"time"
)

// Compile is the main entry point for this package.
// Compile modifies f so that on return:
//   - all Values in f map to 0 or 1 assembly instructions of the target architecture
//   - the order of f.Blocks is the order to emit the Blocks
//   - the order of b.Values is the order to emit the Values in each Block
//   - f has a non-nil regAlloc field
func Compile(f *Func) {

combine the go.o object file and any supporting non-Go code into a
final executable. External linking avoids the dynamic library
requirement but introduces a requirement that the host linker be
present to create such a binary.

Most builds both compile source code and invoke the linker to create a
binary. When cgo is involved, the compile step already requires gcc, so

		// initialization code.
		//
		// The user remains responsible for linking against
		// -lgo -lpthread -lm in the final link. We can't use
		// -r to pick them up because we can't combine
		// split-stack and non-split-stack code in a single -r
		// link, and libgo picks up non-split-stack code from
		// libffi.
		ldflags = append(ldflags, "-Wl,-r", "-nostdlib")
		ldflags = append(ldflags, goLibBegin...)

}

// pluginPath computes the package path for a plugin main package.
//
// This is typically the import path of the main package p, unless the
// plugin is being built directly from source files. In that case we
// combine the package build ID with the contents of the main package
// source files. This allows us to identify two different plugins
// built from two source files with the same name.
func pluginPath(a *Action) string {

		}
		first = second
	}
	return false
}

// Merge combines the intervals from "is" and "is2" and returns
// a new Intervals object containing all combined ranges from the
// two inputs.
func (is Intervals) Merge(is2 Intervals) Intervals {
	if len(is) == 0 {
		return is2
	} else if len(is2) == 0 {
		return is
	}
	// walk the combined set of intervals and merge them together.
	var ret Intervals