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opt / golang / 1.19.4 / src / cmd / compile / internal / ssa /

📁 ..
📄 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: flags_test.go

// Copyright 2020 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.

//go:build amd64 || arm64
// +build amd64 arm64

package ssa

// This file tests the functions addFlags64 and subFlags64 by comparing their
// results to what the chip calculates.

import (
	"runtime"
	"testing"
)

func TestAddFlagsNative(t *testing.T) {
	var numbers = []int64{
		1, 0, -1,
		2, -2,
		1<<63 - 1, -1 << 63,
	}
	coverage := map[flagConstant]bool{}
	for _, x := range numbers {
		for _, y := range numbers {
			a := addFlags64(x, y)
			b := flagRegister2flagConstant(asmAddFlags(x, y), false)
			if a != b {
				t.Errorf("asmAdd diff: x=%x y=%x got=%s want=%s\n", x, y, a, b)
			}
			coverage[a] = true
		}
	}
	if len(coverage) != 9 { // TODO: can we cover all outputs?
		t.Errorf("coverage too small, got %d want 9", len(coverage))
	}
}

func TestSubFlagsNative(t *testing.T) {
	var numbers = []int64{
		1, 0, -1,
		2, -2,
		1<<63 - 1, -1 << 63,
	}
	coverage := map[flagConstant]bool{}
	for _, x := range numbers {
		for _, y := range numbers {
			a := subFlags64(x, y)
			b := flagRegister2flagConstant(asmSubFlags(x, y), true)
			if a != b {
				t.Errorf("asmSub diff: x=%x y=%x got=%s want=%s\n", x, y, a, b)
			}
			coverage[a] = true
		}
	}
	if len(coverage) != 7 { // TODO: can we cover all outputs?
		t.Errorf("coverage too small, got %d want 7", len(coverage))
	}
}

func TestAndFlagsNative(t *testing.T) {
	var numbers = []int64{
		1, 0, -1,
		2, -2,
		1<<63 - 1, -1 << 63,
	}
	coverage := map[flagConstant]bool{}
	for _, x := range numbers {
		for _, y := range numbers {
			a := logicFlags64(x & y)
			b := flagRegister2flagConstant(asmAndFlags(x, y), false)
			if a != b {
				t.Errorf("asmAnd diff: x=%x y=%x got=%s want=%s\n", x, y, a, b)
			}
			coverage[a] = true
		}
	}
	if len(coverage) != 3 {
		t.Errorf("coverage too small, got %d want 3", len(coverage))
	}
}

func asmAddFlags(x, y int64) int
func asmSubFlags(x, y int64) int
func asmAndFlags(x, y int64) int

func flagRegister2flagConstant(x int, sub bool) flagConstant {
	var fcb flagConstantBuilder
	switch runtime.GOARCH {
	case "amd64":
		fcb.Z = x>>6&1 != 0
		fcb.N = x>>7&1 != 0
		fcb.C = x>>0&1 != 0
		if sub {
			// Convert from amd64-sense to arm-sense
			fcb.C = !fcb.C
		}
		fcb.V = x>>11&1 != 0
	case "arm64":
		fcb.Z = x>>30&1 != 0
		fcb.N = x>>31&1 != 0
		fcb.C = x>>29&1 != 0
		fcb.V = x>>28&1 != 0
	default:
		panic("unsupported architecture: " + runtime.GOARCH)
	}
	return fcb.encode()
}

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Editing: flags_test.go

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