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📁 ..
📄 README.md(8.14 KB)
📄 TODO(950 B)
📄 addressingmodes.go(23.64 KB)
📄 bench_test.go(531 B)
📄 biasedsparsemap.go(2.71 KB)
📄 block.go(11.1 KB)
📄 branchelim.go(11.98 KB)
📄 branchelim_test.go(5.21 KB)
📄 cache.go(2.46 KB)
📄 check.go(16.59 KB)
📄 checkbce.go(956 B)
📄 compile.go(18.19 KB)
📄 config.go(11.7 KB)
📄 copyelim.go(1.83 KB)
📄 copyelim_test.go(1.29 KB)
📄 critical.go(3.19 KB)
📄 cse.go(9.43 KB)
📄 cse_test.go(4.25 KB)
📄 deadcode.go(9.61 KB)
📄 deadcode_test.go(3.49 KB)
📄 deadstore.go(9.08 KB)
📄 deadstore_test.go(4.09 KB)
📄 debug.go(56.34 KB)
📄 debug_lines_test.go(8.29 KB)
📄 debug_test.go(28.75 KB)
📄 decompose.go(13.41 KB)
📄 dom.go(7.98 KB)
📄 dom_test.go(13.34 KB)
📄 expand_calls.go(63.5 KB)
📄 export_test.go(3.23 KB)
📄 flagalloc.go(6.68 KB)
📄 flags_amd64_test.s(533 B)
📄 flags_arm64_test.s(699 B)
📄 flags_test.go(2.49 KB)
📄 func.go(27.08 KB)
📄 func_test.go(13.07 KB)
📄 fuse.go(6.5 KB)
📄 fuse_branchredirect.go(3.24 KB)
📄 fuse_comparisons.go(4.04 KB)
📄 fuse_test.go(7.21 KB)
📁 gen
📄 html.go(34.72 KB)
📄 id.go(576 B)
📄 layout.go(4.82 KB)
📄 lca.go(3.77 KB)
📄 lca_test.go(1.65 KB)
📄 likelyadjust.go(15.24 KB)
📄 location.go(3.06 KB)
📄 loopbce.go(10.54 KB)
📄 loopreschedchecks.go(15.86 KB)
📄 looprotate.go(2.61 KB)
📄 lower.go(1.36 KB)
📄 magic.go(15.77 KB)
📄 magic_test.go(9.1 KB)
📄 nilcheck.go(11.06 KB)
📄 nilcheck_test.go(12.17 KB)
📄 numberlines.go(7.83 KB)
📄 op.go(18.65 KB)
📄 opGen.go(1.01 MB)
📄 opt.go(308 B)
📄 passbm_test.go(3.14 KB)
📄 phielim.go(1.48 KB)
📄 phiopt.go(8.08 KB)
📄 poset.go(37.2 KB)
📄 poset_test.go(18.14 KB)
📄 print.go(3.85 KB)
📄 prove.go(41.82 KB)
📄 regalloc.go(83.69 KB)
📄 regalloc_test.go(6.49 KB)
📄 rewrite.go(53.49 KB)
📄 rewrite386.go(289.01 KB)
📄 rewrite386splitload.go(4.05 KB)
📄 rewriteAMD64.go(888.95 KB)
📄 rewriteAMD64splitload.go(21.41 KB)
📄 rewriteARM.go(487.7 KB)
📄 rewriteARM64.go(751.84 KB)
📄 rewriteCond_test.go(10.62 KB)
📄 rewriteLOONG64.go(193.44 KB)
📄 rewriteMIPS.go(174.44 KB)
📄 rewriteMIPS64.go(195.55 KB)
📄 rewritePPC64.go(431.6 KB)
📄 rewriteRISCV64.go(159.66 KB)
📄 rewriteS390X.go(433.4 KB)
📄 rewriteWasm.go(109.86 KB)
📄 rewrite_test.go(6.91 KB)
📄 rewritedec.go(10.16 KB)
📄 rewritedec64.go(63.77 KB)
📄 rewritegeneric.go(617.96 KB)
📄 schedule.go(18.23 KB)
📄 schedule_test.go(2.91 KB)
📄 shift_test.go(4.05 KB)
📄 shortcircuit.go(12.63 KB)
📄 shortcircuit_test.go(1.31 KB)
📄 sizeof_test.go(855 B)
📄 softfloat.go(1.99 KB)
📄 sparsemap.go(1.98 KB)
📄 sparseset.go(1.54 KB)
📄 sparsetree.go(8.05 KB)
📄 stackalloc.go(12.79 KB)
📄 stackframe.go(290 B)
📄 stmtlines_test.go(2.96 KB)
📁 testdata
📄 tighten.go(4.3 KB)
📄 trim.go(4.24 KB)
📄 tuple.go(1.97 KB)
📄 value.go(15.21 KB)
📄 writebarrier.go(19.29 KB)
📄 writebarrier_test.go(1.75 KB)
📄 xposmap.go(3.29 KB)
📄 zcse.go(2.07 KB)
📄 zeroextension_test.go(1.66 KB)

Editing: magic_test.go

// Copyright 2017 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.

package ssa

import (
	"math/big"
	"testing"
)

func TestMagicExhaustive8(t *testing.T) {
	testMagicExhaustive(t, 8)
}
func TestMagicExhaustive8U(t *testing.T) {
	testMagicExhaustiveU(t, 8)
}
func TestMagicExhaustive16(t *testing.T) {
	if testing.Short() {
		t.Skip("slow test; skipping")
	}
	testMagicExhaustive(t, 16)
}
func TestMagicExhaustive16U(t *testing.T) {
	if testing.Short() {
		t.Skip("slow test; skipping")
	}
	testMagicExhaustiveU(t, 16)
}

// exhaustive test of magic for n bits
func testMagicExhaustive(t *testing.T, n uint) {
	min := -int64(1) << (n - 1)
	max := int64(1) << (n - 1)
	for c := int64(1); c < max; c++ {
		if !smagicOK(n, int64(c)) {
			continue
		}
		m := int64(smagic(n, c).m)
		s := smagic(n, c).s
		for i := min; i < max; i++ {
			want := i / c
			got := (i * m) >> (n + uint(s))
			if i < 0 {
				got++
			}
			if want != got {
				t.Errorf("signed magic wrong for %d / %d: got %d, want %d (m=%d,s=%d)\n", i, c, got, want, m, s)
			}
		}
	}
}
func testMagicExhaustiveU(t *testing.T, n uint) {
	max := uint64(1) << n
	for c := uint64(1); c < max; c++ {
		if !umagicOK(n, int64(c)) {
			continue
		}
		m := umagic(n, int64(c)).m
		s := umagic(n, int64(c)).s
		for i := uint64(0); i < max; i++ {
			want := i / c
			got := (i * (max + m)) >> (n + uint(s))
			if want != got {
				t.Errorf("unsigned magic wrong for %d / %d: got %d, want %d (m=%d,s=%d)\n", i, c, got, want, m, s)
			}
		}
	}
}

func TestMagicUnsigned(t *testing.T) {
	One := new(big.Int).SetUint64(1)
	for _, n := range [...]uint{8, 16, 32, 64} {
		TwoN := new(big.Int).Lsh(One, n)
		Max := new(big.Int).Sub(TwoN, One)
		for _, c := range [...]uint64{
			3,
			5,
			6,
			7,
			9,
			10,
			11,
			12,
			13,
			14,
			15,
			17,
			1<<8 - 1,
			1<<8 + 1,
			1<<16 - 1,
			1<<16 + 1,
			1<<32 - 1,
			1<<32 + 1,
			1<<64 - 1,
		} {
			if c>>n != 0 {
				continue // not appropriate for the given n.
			}
			if !umagicOK(n, int64(c)) {
				t.Errorf("expected n=%d c=%d to pass\n", n, c)
			}
			m := umagic(n, int64(c)).m
			s := umagic(n, int64(c)).s

C := new(big.Int).SetUint64(c)
			M := new(big.Int).SetUint64(m)
			M.Add(M, TwoN)

// Find largest multiple of c.
			Mul := new(big.Int).Div(Max, C)
			Mul.Mul(Mul, C)
			mul := Mul.Uint64()

// Try some input values, mostly around multiples of c.
			for _, x := range [...]uint64{0, 1,
				c - 1, c, c + 1,
				2*c - 1, 2 * c, 2*c + 1,
				mul - 1, mul, mul + 1,
				uint64(1)<<n - 1,
			} {
				X := new(big.Int).SetUint64(x)
				if X.Cmp(Max) > 0 {
					continue
				}
				Want := new(big.Int).Quo(X, C)
				Got := new(big.Int).Mul(X, M)
				Got.Rsh(Got, n+uint(s))
				if Want.Cmp(Got) != 0 {
					t.Errorf("umagic for %d/%d n=%d doesn't work, got=%s, want %s\n", x, c, n, Got, Want)
				}
			}
		}
	}
}

func TestMagicSigned(t *testing.T) {
	One := new(big.Int).SetInt64(1)
	for _, n := range [...]uint{8, 16, 32, 64} {
		TwoNMinusOne := new(big.Int).Lsh(One, n-1)
		Max := new(big.Int).Sub(TwoNMinusOne, One)
		Min := new(big.Int).Neg(TwoNMinusOne)
		for _, c := range [...]int64{
			3,
			5,
			6,
			7,
			9,
			10,
			11,
			12,
			13,
			14,
			15,
			17,
			1<<7 - 1,
			1<<7 + 1,
			1<<15 - 1,
			1<<15 + 1,
			1<<31 - 1,
			1<<31 + 1,
			1<<63 - 1,
		} {
			if c>>(n-1) != 0 {
				continue // not appropriate for the given n.
			}
			if !smagicOK(n, int64(c)) {
				t.Errorf("expected n=%d c=%d to pass\n", n, c)
			}
			m := smagic(n, int64(c)).m
			s := smagic(n, int64(c)).s

C := new(big.Int).SetInt64(c)
			M := new(big.Int).SetUint64(m)

// Find largest multiple of c.
			Mul := new(big.Int).Div(Max, C)
			Mul.Mul(Mul, C)
			mul := Mul.Int64()

// Try some input values, mostly around multiples of c.
			for _, x := range [...]int64{
				-1, 1,
				-c - 1, -c, -c + 1, c - 1, c, c + 1,
				-2*c - 1, -2 * c, -2*c + 1, 2*c - 1, 2 * c, 2*c + 1,
				-mul - 1, -mul, -mul + 1, mul - 1, mul, mul + 1,
				int64(1)<<(n-1) - 1, -int64(1) << (n - 1),
			} {
				X := new(big.Int).SetInt64(x)
				if X.Cmp(Min) < 0 || X.Cmp(Max) > 0 {
					continue
				}
				Want := new(big.Int).Quo(X, C)
				Got := new(big.Int).Mul(X, M)
				Got.Rsh(Got, n+uint(s))
				if x < 0 {
					Got.Add(Got, One)
				}
				if Want.Cmp(Got) != 0 {
					t.Errorf("smagic for %d/%d n=%d doesn't work, got=%s, want %s\n", x, c, n, Got, Want)
				}
			}
		}
	}
}

func testDivisibleExhaustiveU(t *testing.T, n uint) {
	maxU := uint64(1) << n
	for c := uint64(1); c < maxU; c++ {
		if !udivisibleOK(n, int64(c)) {
			continue
		}
		k := udivisible(n, int64(c)).k
		m := udivisible(n, int64(c)).m
		max := udivisible(n, int64(c)).max
		mask := ^uint64(0) >> (64 - n)
		for i := uint64(0); i < maxU; i++ {
			want := i%c == 0
			mul := (i * m) & mask
			rot := (mul>>uint(k) | mul<<(n-uint(k))) & mask
			got := rot <= max
			if want != got {
				t.Errorf("unsigned divisible wrong for %d %% %d == 0: got %v, want %v (k=%d,m=%d,max=%d)\n", i, c, got, want, k, m, max)
			}
		}
	}
}

func TestDivisibleExhaustive8U(t *testing.T) {
	testDivisibleExhaustiveU(t, 8)
}

func TestDivisibleExhaustive16U(t *testing.T) {
	if testing.Short() {
		t.Skip("slow test; skipping")
	}
	testDivisibleExhaustiveU(t, 16)
}

func TestDivisibleUnsigned(t *testing.T) {
	One := new(big.Int).SetUint64(1)
	for _, n := range [...]uint{8, 16, 32, 64} {
		TwoN := new(big.Int).Lsh(One, n)
		Max := new(big.Int).Sub(TwoN, One)
		for _, c := range [...]uint64{
			3,
			5,
			6,
			7,
			9,
			10,
			11,
			12,
			13,
			14,
			15,
			17,
			1<<8 - 1,
			1<<8 + 1,
			1<<16 - 1,
			1<<16 + 1,
			1<<32 - 1,
			1<<32 + 1,
			1<<64 - 1,
		} {
			if c>>n != 0 {
				continue // c too large for the given n.
			}
			if !udivisibleOK(n, int64(c)) {
				t.Errorf("expected n=%d c=%d to pass\n", n, c)
			}
			k := udivisible(n, int64(c)).k
			m := udivisible(n, int64(c)).m
			max := udivisible(n, int64(c)).max
			mask := ^uint64(0) >> (64 - n)

C := new(big.Int).SetUint64(c)

// Find largest multiple of c.
			Mul := new(big.Int).Div(Max, C)
			Mul.Mul(Mul, C)
			mul := Mul.Uint64()

// Try some input values, mostly around multiples of c.
			for _, x := range [...]uint64{0, 1,
				c - 1, c, c + 1,
				2*c - 1, 2 * c, 2*c + 1,
				mul - 1, mul, mul + 1,
				uint64(1)<<n - 1,
			} {
				X := new(big.Int).SetUint64(x)
				if X.Cmp(Max) > 0 {
					continue
				}
				want := x%c == 0
				mul := (x * m) & mask
				rot := (mul>>uint(k) | mul<<(n-uint(k))) & mask
				got := rot <= max
				if want != got {
					t.Errorf("unsigned divisible wrong for %d %% %d == 0: got %v, want %v (k=%d,m=%d,max=%d)\n", x, c, got, want, k, m, max)
				}
			}
		}
	}
}

func testDivisibleExhaustive(t *testing.T, n uint) {
	minI := -int64(1) << (n - 1)
	maxI := int64(1) << (n - 1)
	for c := int64(1); c < maxI; c++ {
		if !sdivisibleOK(n, int64(c)) {
			continue
		}
		k := sdivisible(n, int64(c)).k
		m := sdivisible(n, int64(c)).m
		a := sdivisible(n, int64(c)).a
		max := sdivisible(n, int64(c)).max
		mask := ^uint64(0) >> (64 - n)
		for i := minI; i < maxI; i++ {
			want := i%c == 0
			mul := (uint64(i)*m + a) & mask
			rot := (mul>>uint(k) | mul<<(n-uint(k))) & mask
			got := rot <= max
			if want != got {
				t.Errorf("signed divisible wrong for %d %% %d == 0: got %v, want %v (k=%d,m=%d,a=%d,max=%d)\n", i, c, got, want, k, m, a, max)
			}
		}
	}
}

func TestDivisibleExhaustive8(t *testing.T) {
	testDivisibleExhaustive(t, 8)
}

func TestDivisibleExhaustive16(t *testing.T) {
	if testing.Short() {
		t.Skip("slow test; skipping")
	}
	testDivisibleExhaustive(t, 16)
}

func TestDivisibleSigned(t *testing.T) {
	One := new(big.Int).SetInt64(1)
	for _, n := range [...]uint{8, 16, 32, 64} {
		TwoNMinusOne := new(big.Int).Lsh(One, n-1)
		Max := new(big.Int).Sub(TwoNMinusOne, One)
		Min := new(big.Int).Neg(TwoNMinusOne)
		for _, c := range [...]int64{
			3,
			5,
			6,
			7,
			9,
			10,
			11,
			12,
			13,
			14,
			15,
			17,
			1<<7 - 1,
			1<<7 + 1,
			1<<15 - 1,
			1<<15 + 1,
			1<<31 - 1,
			1<<31 + 1,
			1<<63 - 1,
		} {
			if c>>(n-1) != 0 {
				continue // not appropriate for the given n.
			}
			if !sdivisibleOK(n, int64(c)) {
				t.Errorf("expected n=%d c=%d to pass\n", n, c)
			}
			k := sdivisible(n, int64(c)).k
			m := sdivisible(n, int64(c)).m
			a := sdivisible(n, int64(c)).a
			max := sdivisible(n, int64(c)).max
			mask := ^uint64(0) >> (64 - n)

C := new(big.Int).SetInt64(c)

// Find largest multiple of c.
			Mul := new(big.Int).Div(Max, C)
			Mul.Mul(Mul, C)
			mul := Mul.Int64()

// Try some input values, mostly around multiples of c.
			for _, x := range [...]int64{
				-1, 1,
				-c - 1, -c, -c + 1, c - 1, c, c + 1,
				-2*c - 1, -2 * c, -2*c + 1, 2*c - 1, 2 * c, 2*c + 1,
				-mul - 1, -mul, -mul + 1, mul - 1, mul, mul + 1,
				int64(1)<<(n-1) - 1, -int64(1) << (n - 1),
			} {
				X := new(big.Int).SetInt64(x)
				if X.Cmp(Min) < 0 || X.Cmp(Max) > 0 {
					continue
				}
				want := x%c == 0
				mul := (uint64(x)*m + a) & mask
				rot := (mul>>uint(k) | mul<<(n-uint(k))) & mask
				got := rot <= max
				if want != got {
					t.Errorf("signed divisible wrong for %d %% %d == 0: got %v, want %v (k=%d,m=%d,a=%d,max=%d)\n", x, c, got, want, k, m, a, max)
				}
			}
		}
	}
}

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Editing: magic_test.go

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