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fb165eaffd
Do the similar thing to CL 55143 to reduce IMUL. Change-Id: I1bd38f618058e3cd74fac181f003610ea13f2294 Reviewed-on: https://go-review.googlesource.com/56252 Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
118 lines
3.2 KiB
Go
118 lines
3.2 KiB
Go
// runoutput
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "fmt"
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// Check that expressions like (c*n + d*(n+k)) get correctly merged by
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// the compiler into (c+d)*n + d*k (with c+d and d*k computed at
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// compile time).
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//
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// The merging is performed by a combination of the multiplication
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// merge rules
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// (c*n + d*n) -> (c+d)*n
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// and the distributive multiplication rules
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// c * (d+x) -> c*d + c*x
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// Generate a MergeTest that looks like this:
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//
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// a8, b8 = m1*n8 + m2*(n8+k), (m1+m2)*n8 + m2*k
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// if a8 != b8 {
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// // print error msg and panic
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// }
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func makeMergeAddTest(m1, m2, k int, size string) string {
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model := " a" + size + ", b" + size
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model += fmt.Sprintf(" = %%d*n%s + %%d*(n%s+%%d), (%%d+%%d)*n%s + (%%d*%%d)", size, size, size)
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test := fmt.Sprintf(model, m1, m2, k, m1, m2, m2, k)
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test += fmt.Sprintf(`
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if a%s != b%s {
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fmt.Printf("MergeAddTest(%d, %d, %d, %s) failed\n")
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fmt.Printf("%%d != %%d\n", a%s, b%s)
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panic("FAIL")
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}
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`, size, size, m1, m2, k, size, size, size)
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return test + "\n"
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}
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// Check that expressions like (c*n - d*(n+k)) get correctly merged by
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// the compiler into (c-d)*n - d*k (with c-d and d*k computed at
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// compile time).
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//
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// The merging is performed by a combination of the multiplication
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// merge rules
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// (c*n - d*n) -> (c-d)*n
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// and the distributive multiplication rules
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// c * (d-x) -> c*d - c*x
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// Generate a MergeTest that looks like this:
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//
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// a8, b8 = m1*n8 - m2*(n8+k), (m1-m2)*n8 - m2*k
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// if a8 != b8 {
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// // print error msg and panic
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// }
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func makeMergeSubTest(m1, m2, k int, size string) string {
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model := " a" + size + ", b" + size
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model += fmt.Sprintf(" = %%d*n%s - %%d*(n%s+%%d), (%%d-%%d)*n%s - (%%d*%%d)", size, size, size)
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test := fmt.Sprintf(model, m1, m2, k, m1, m2, m2, k)
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test += fmt.Sprintf(`
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if a%s != b%s {
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fmt.Printf("MergeSubTest(%d, %d, %d, %s) failed\n")
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fmt.Printf("%%d != %%d\n", a%s, b%s)
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panic("FAIL")
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}
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`, size, size, m1, m2, k, size, size, size)
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return test + "\n"
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}
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func makeAllSizes(m1, m2, k int) string {
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var tests string
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tests += makeMergeAddTest(m1, m2, k, "8")
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tests += makeMergeAddTest(m1, m2, k, "16")
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tests += makeMergeAddTest(m1, m2, k, "32")
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tests += makeMergeAddTest(m1, m2, k, "64")
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tests += makeMergeSubTest(m1, m2, k, "8")
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tests += makeMergeSubTest(m1, m2, k, "16")
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tests += makeMergeSubTest(m1, m2, k, "32")
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tests += makeMergeSubTest(m1, m2, k, "64")
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tests += "\n"
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return tests
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}
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func main() {
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fmt.Println(`package main
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import "fmt"
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var n8 int8 = 42
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var n16 int16 = 42
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var n32 int32 = 42
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var n64 int64 = 42
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func main() {
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var a8, b8 int8
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var a16, b16 int16
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var a32, b32 int32
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var a64, b64 int64
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`)
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fmt.Println(makeAllSizes(03, 05, 0)) // 3*n + 5*n
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fmt.Println(makeAllSizes(17, 33, 0))
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fmt.Println(makeAllSizes(80, 45, 0))
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fmt.Println(makeAllSizes(32, 64, 0))
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fmt.Println(makeAllSizes(7, 11, +1)) // 7*n + 11*(n+1)
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fmt.Println(makeAllSizes(9, 13, +2))
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fmt.Println(makeAllSizes(11, 16, -1))
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fmt.Println(makeAllSizes(17, 9, -2))
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fmt.Println("}")
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}
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