go/test/prove_constant_folding.go

// errorcheck -0 -d=ssa/prove/debug=2

//go:build amd64

// 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 main

func f0i(x int) int {
  if x == 20 {
    return x // ERROR "Proved.+is constant 20$"
  }

  if (x + 20) == 20 {
    return x + 5 // ERROR "Proved.+is constant 0$" "Proved.+is constant 5$"
  }

  return x / 2
}

func f0u(x uint) uint {
  if x == 20 {
    return x // ERROR "Proved.+is constant 20$"
  }

  if (x + 20) == 20 {
    return x + 5 // ERROR "Proved.+is constant 0$" "Proved.+is constant 5$"
  }

  return x / 2
}