blob: a23115b612392acd95a38c8b390b297abac031e8 [file] [log] [blame]
 // runoutput // 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 main import "fmt" // Check that expressions like (c*n + d*(n+k)) get correctly merged by // the compiler into (c+d)*n + d*k (with c+d and d*k computed at // compile time). // // The merging is performed by a combination of the multiplication // merge rules // (c*n + d*n) -> (c+d)*n // and the distributive multiplication rules // c * (d+x) -> c*d + c*x // Generate a MergeTest that looks like this: // // a8, b8 = m1*n8 + m2*(n8+k), (m1+m2)*n8 + m2*k // if a8 != b8 { // // print error msg and panic // } func makeMergeAddTest(m1, m2, k int, size string) string { model := " a" + size + ", b" + size model += fmt.Sprintf(" = %%d*n%s + %%d*(n%s+%%d), (%%d+%%d)*n%s + (%%d*%%d)", size, size, size) test := fmt.Sprintf(model, m1, m2, k, m1, m2, m2, k) test += fmt.Sprintf(` if a%s != b%s { fmt.Printf("MergeAddTest(%d, %d, %d, %s) failed\n") fmt.Printf("%%d != %%d\n", a%s, b%s) panic("FAIL") } `, size, size, m1, m2, k, size, size, size) return test + "\n" } // Check that expressions like (c*n - d*(n+k)) get correctly merged by // the compiler into (c-d)*n - d*k (with c-d and d*k computed at // compile time). // // The merging is performed by a combination of the multiplication // merge rules // (c*n - d*n) -> (c-d)*n // and the distributive multiplication rules // c * (d-x) -> c*d - c*x // Generate a MergeTest that looks like this: // // a8, b8 = m1*n8 - m2*(n8+k), (m1-m2)*n8 - m2*k // if a8 != b8 { // // print error msg and panic // } func makeMergeSubTest(m1, m2, k int, size string) string { model := " a" + size + ", b" + size model += fmt.Sprintf(" = %%d*n%s - %%d*(n%s+%%d), (%%d-%%d)*n%s - (%%d*%%d)", size, size, size) test := fmt.Sprintf(model, m1, m2, k, m1, m2, m2, k) test += fmt.Sprintf(` if a%s != b%s { fmt.Printf("MergeSubTest(%d, %d, %d, %s) failed\n") fmt.Printf("%%d != %%d\n", a%s, b%s) panic("FAIL") } `, size, size, m1, m2, k, size, size, size) return test + "\n" } func makeAllSizes(m1, m2, k int) string { var tests string tests += makeMergeAddTest(m1, m2, k, "8") tests += makeMergeAddTest(m1, m2, k, "16") tests += makeMergeAddTest(m1, m2, k, "32") tests += makeMergeAddTest(m1, m2, k, "64") tests += makeMergeSubTest(m1, m2, k, "8") tests += makeMergeSubTest(m1, m2, k, "16") tests += makeMergeSubTest(m1, m2, k, "32") tests += makeMergeSubTest(m1, m2, k, "64") tests += "\n" return tests } func main() { fmt.Println(`package main import "fmt" var n8 int8 = 42 var n16 int16 = 42 var n32 int32 = 42 var n64 int64 = 42 func main() { var a8, b8 int8 var a16, b16 int16 var a32, b32 int32 var a64, b64 int64 `) fmt.Println(makeAllSizes(03, 05, 0)) // 3*n + 5*n fmt.Println(makeAllSizes(17, 33, 0)) fmt.Println(makeAllSizes(80, 45, 0)) fmt.Println(makeAllSizes(32, 64, 0)) fmt.Println(makeAllSizes(7, 11, +1)) // 7*n + 11*(n+1) fmt.Println(makeAllSizes(9, 13, +2)) fmt.Println(makeAllSizes(11, 16, -1)) fmt.Println(makeAllSizes(17, 9, -2)) fmt.Println("}") }