// Remove zero extension of conditional move.
// Note: only for MOVBZreg for now since it is added as part of 'if' statement lowering.
(MOVBZreg x:(LOCGR (MOVDconst [c]) (MOVDconst [d]) _))
  && int64(uint8(c)) == c
  && int64(uint8(d)) == d
  && (!x.Type.IsSigned() || x.Type.Size() > 1)
  => x

// Fold boolean tests into blocks.
// Note: this must match If statement lowering.

		rel.Sym = p.To.Sym
		rel.Add = p.To.Offset
		if p.As == AJAL {
			rel.Type = objabi.R_CALLMIPS
		} else {
			rel.Type = objabi.R_JMPMIPS
		}

	case 12: /* movbs r,r */
		// NOTE: this case does not use REGTMP. If it ever does,
		// remove the NOTUSETMP flag in optab.
		v := 16
		if p.As == AMOVB {
			v = 24
		}
		o1 = OP_SRR(c.opirr(ASLL), uint32(v), p.From.Reg, p.To.Reg)

(RoundToEven x) => (ROUNDSD [0] x)
(Floor x)       => (ROUNDSD [1] x)
(Ceil x)        => (ROUNDSD [2] x)
(Trunc x)       => (ROUNDSD [3] x)

(FMA x y z) => (VFMADD231SD z x y)

// Lowering extension
// Note: we always extend to 64 bits even though some ops don't need that many result bits.
(SignExt8to16  ...) => (MOVBQSX ...)
(SignExt8to32  ...) => (MOVBQSX ...)
(SignExt8to64  ...) => (MOVBQSX ...)

	    If -cpu is set, run n times for each GOMAXPROCS value.
	    Examples are always run once. -count does not apply to
	    fuzz tests matched by -fuzz.

	-cover
	    Enable coverage analysis.
	    Note that because coverage works by annotating the source
	    code before compilation, compilation and test failures with
	    coverage enabled may report line numbers that don't correspond
	    to the original sources.

// registers for allocation. This affinity helps eliminate moves that
// are required for phi implementations and helps generate allocations
// for 2-register architectures.

// Note: regalloc generates a not-quite-SSA output. If we have:
//
//             b1: x = ... : AX
//                 x2 = StoreReg x
//                 ... AX gets reused for something else ...

		// exception: newer GCC versions will sometimes emit
		// an error on a macro #define with a note referring
		// to where the expansion occurs. We care about where
		// the expansion occurs, so in that case treat the note
		// as an error.
		isError := strings.Contains(line, ": error:")
		isErrorNote := strings.Contains(line, ": note:") && sawUnmatchedErrors
		if !isError && !isErrorNote {
			continue
		}

	"cmd/go/internal/par"
	"cmd/go/internal/search"
	"cmd/go/internal/toolchain"
	"cmd/go/internal/work"

	"golang.org/x/mod/modfile"
	"golang.org/x/mod/module"
)

var CmdGet = &base.Command{
	// Note: flags below are listed explicitly because they're the most common.
	// Do not send CLs removing them because they're covered by [get flags].
	UsageLine: "go get [-t] [-u] [-v] [build flags] [packages]",

// pattern should close over tests (as in Go 1.11–1.15) or stop at only those
// packages transitively imported by the packages and tests in the main module
// ("all" in Go 1.16+ and "go mod vendor" in Go 1.11+).
//
// Note that it is possible for a loaded package NOT to be in "all" even when we
// are loading the "all" pattern. For example, packages that are transitive
// dependencies of other roots named on the command line must be loaded, but are

		for i := 0; i < len(tfs) && i < len(xfs); i++ {
			t1, x1 := tfs[i], xfs[i]
			if t1.Embedded != x1.Embedded {
				return cmpForNe(t1.Embedded < x1.Embedded)
			}
			if t1.Note != x1.Note {
				return cmpForNe(t1.Note < x1.Note)
			}
			if c := t1.Sym.cmpsym(x1.Sym); c != CMPeq {
				return c
			}
			if c := t1.Type.cmp(x1.Type); c != CMPeq {
				return c
			}
		}

// iterating to an answer.
//
// If previousBlock is non-nil, it registers changes vs. that block's
// end state in state.changedVars. Note that previousBlock will often
// not be a predecessor.
//
// Note that mergePredecessors behaves slightly differently between
// first and subsequent calls for a block.  For the first call, the
// starting state is approximated by taking the state from the