// 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) {

		indexU64 := pos / 64
		indexBit := pos % 64
		var bitBuf uint64
		if indexBit < 64-w {
			// This window's bits are contained in a single u64
			bitBuf = digits[indexU64] >> indexBit
		} else {
			// Combine the current 64 bits with bits from the next 64
			bitBuf = (digits[indexU64] >> indexBit) | (digits[1+indexU64] << (64 - indexBit))
		}

		// Add carry into the current window
		window := carry + (bitBuf & windowMask)

	if len(profiles) == 1 && len(msrcs) == 1 {
		return profiles[0], msrcs[0], nil
	}

	p, err := profile.Merge(profiles)
	if err != nil {
		return nil, nil, err
	}

	// Combine mapping sources.
	msrc := make(plugin.MappingSources)
	for _, ms := range msrcs {
		for m, s := range ms {
			msrc[m] = append(msrc[m], s...)
		}
	}
	return p, msrc, nil
}

		// 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 {

		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

	if iexpr, _ := call.Fun.(*syntax.IndexExpr); iexpr != nil {
		if check.indexExpr(x, iexpr) {
			// Delay function instantiation to argument checking,
			// where we combine type and value arguments for type
			// inference.
			assert(x.mode == value)
			inst = iexpr
		}
		x.expr = iexpr
		check.record(x)
	} else {
		check.exprOrType(x, call.Fun, true)
	}

		}
		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