| // Copyright 2022 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_test |
| |
| import ( |
| "internal/testenv" |
| "path/filepath" |
| "regexp" |
| "runtime" |
| "testing" |
| ) |
| |
| // TestFmaHash checks that the hash-test machinery works properly for a single case. |
| // It also runs ssa/check and gccheck to be sure that those are checked at least a |
| // little in each run.bash. It does not check or run the generated code. |
| // The test file is however a useful example of fused-vs-cascaded multiply-add. |
| func TestFmaHash(t *testing.T) { |
| switch runtime.GOOS { |
| case "linux", "darwin": |
| default: |
| t.Skipf("Slow test, usually avoid it, os=%s not linux or darwin", runtime.GOOS) |
| } |
| switch runtime.GOARCH { |
| case "amd64", "arm64": |
| default: |
| t.Skipf("Slow test, usually avoid it, arch=%s not amd64 or arm64", runtime.GOARCH) |
| } |
| |
| testenv.MustHaveGoBuild(t) |
| gocmd := testenv.GoToolPath(t) |
| tmpdir := t.TempDir() |
| source := filepath.Join("testdata", "fma.go") |
| output := filepath.Join(tmpdir, "fma.exe") |
| cmd := testenv.Command(t, gocmd, "build", "-o", output, source) |
| // The hash-dependence on file path name is dodged by specifying "all hashes ending in 1" plus "all hashes ending in 0" |
| // i.e., all hashes. This will print all the FMAs; this test is only interested in one of them (that should appear near the end). |
| cmd.Env = append(cmd.Env, "GOCOMPILEDEBUG=fmahash=1/0", "GOOS=linux", "GOARCH=arm64", "HOME="+tmpdir) |
| t.Logf("%v", cmd) |
| t.Logf("%v", cmd.Env) |
| b, e := cmd.CombinedOutput() |
| if e != nil { |
| t.Errorf("build failed: %v\n%s", e, b) |
| } |
| s := string(b) // Looking for "GOFMAHASH triggered main.main:24" |
| re := "fmahash(0?) triggered .*fma.go:29:..;.*fma.go:18:.." |
| match := regexp.MustCompile(re) |
| if !match.MatchString(s) { |
| t.Errorf("Expected to match '%s' with \n-----\n%s-----", re, s) |
| } |
| } |