gcc/testsuite/go.test/test/const.go

   1 // run
   2
   3 // Copyright 2009 The Go Authors. All rights reserved.
   4 // Use of this source code is governed by a BSD-style
   5 // license that can be found in the LICENSE file.
   6
   7 // Test simple boolean and numeric constants.
   8
   9 package main
  10
  11 import "os"
  12
  13 const (
  14         c0      = 0
  15         cm1     = -1
  16         chuge   = 1 << 100
  17         chuge_1 = chuge - 1
  18         c1      = chuge >> 100
  19         c3div2  = 3 / 2
  20         c1e3    = 1e3
  21
  22         ctrue  = true
  23         cfalse = !ctrue
  24 )
  25
  26 const (
  27         f0              = 0.0
  28         fm1             = -1.
  29         fhuge   float64 = 1 << 100
  30         fhuge_1 float64 = chuge - 1
  31         f1      float64 = chuge >> 100
  32         f3div2          = 3. / 2.
  33         f1e3    float64 = 1e3
  34 )
  35
  36 func assert(t bool, s string) {
  37         if !t {
  38                 panic(s)
  39         }
  40 }
  41
  42 func ints() {
  43         assert(c0 == 0, "c0")
  44         assert(c1 == 1, "c1")
  45         assert(chuge > chuge_1, "chuge")
  46         assert(chuge_1+1 == chuge, "chuge 1")
  47         assert(chuge+cm1+1 == chuge, "cm1")
  48         assert(c3div2 == 1, "3/2")
  49         assert(c1e3 == 1000, "c1e3 int")
  50         assert(c1e3 == 1e3, "c1e3 float")
  51
  52         // verify that all (in range) are assignable as ints
  53         var i int
  54         i = c0
  55         assert(i == c0, "i == c0")
  56         i = cm1
  57         assert(i == cm1, "i == cm1")
  58         i = c1
  59         assert(i == c1, "i == c1")
  60         i = c3div2
  61         assert(i == c3div2, "i == c3div2")
  62         i = c1e3
  63         assert(i == c1e3, "i == c1e3")
  64
  65         // verify that all are assignable as floats
  66         var f float64
  67         f = c0
  68         assert(f == c0, "f == c0")
  69         f = cm1
  70         assert(f == cm1, "f == cm1")
  71         f = chuge
  72         assert(f == chuge, "f == chuge")
  73         f = chuge_1
  74         assert(f == chuge_1, "f == chuge_1")
  75         f = c1
  76         assert(f == c1, "f == c1")
  77         f = c3div2
  78         assert(f == c3div2, "f == c3div2")
  79         f = c1e3
  80         assert(f == c1e3, "f == c1e3")
  81 }
  82
  83 func floats() {
  84         assert(f0 == c0, "f0")
  85         assert(f1 == c1, "f1")
  86         // TODO(gri): exp/ssa/interp constant folding is incorrect.
  87         if os.Getenv("GOSSAINTERP") == "" {
  88                 assert(fhuge == fhuge_1, "fhuge") // float64 can't distinguish fhuge, fhuge_1.
  89         }
  90         assert(fhuge_1+1 == fhuge, "fhuge 1")
  91         assert(fhuge+fm1+1 == fhuge, "fm1")
  92         assert(f3div2 == 1.5, "3./2.")
  93         assert(f1e3 == 1000, "f1e3 int")
  94         assert(f1e3 == 1.e3, "f1e3 float")
  95
  96         // verify that all (in range) are assignable as ints
  97         var i int
  98         i = f0
  99         assert(i == f0, "i == f0")
 100         i = fm1
 101         assert(i == fm1, "i == fm1")
 102
 103         // verify that all are assignable as floats
 104         var f float64
 105         f = f0
 106         assert(f == f0, "f == f0")
 107         f = fm1
 108         assert(f == fm1, "f == fm1")
 109         f = fhuge
 110         assert(f == fhuge, "f == fhuge")
 111         f = fhuge_1
 112         assert(f == fhuge_1, "f == fhuge_1")
 113         f = f1
 114         assert(f == f1, "f == f1")
 115         f = f3div2
 116         assert(f == f3div2, "f == f3div2")
 117         f = f1e3
 118         assert(f == f1e3, "f == f1e3")
 119 }
 120
 121 func main() {
 122         ints()
 123         floats()
 124
 125         assert(ctrue == true, "ctrue == true")
 126         assert(cfalse == false, "cfalse == false")
 127 }