go truncconst_test 源码
golang truncconst_test 代码
文件路径：/src/cmd/compile/internal/test/truncconst_test.go
// 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 test
import "testing"
var f52want float64 = 1.0 / (1 << 52)
var f53want float64 = 1.0 / (1 << 53)
func TestTruncFlt(t *testing.T) {
const f52 = 1 + 1.0/(1<<52)
const f53 = 1 + 1.0/(1<<53)
if got := f52 - 1; got != f52want {
t.Errorf("f52-1 = %g, want %g", got, f52want)
}
if got := float64(f52) - 1; got != f52want {
t.Errorf("float64(f52)-1 = %g, want %g", got, f52want)
}
if got := f53 - 1; got != f53want {
t.Errorf("f53-1 = %g, want %g", got, f53want)
}
if got := float64(f53) - 1; got != 0 {
t.Errorf("float64(f53)-1 = %g, want 0", got)
}
}
func TestTruncCmplx(t *testing.T) {
const r52 = complex(1+1.0/(1<<52), 0)
const r53 = complex(1+1.0/(1<<53), 0)
if got := real(r52 - 1); got != f52want {
t.Errorf("real(r52-1) = %g, want %g", got, f52want)
}
if got := real(complex128(r52) - 1); got != f52want {
t.Errorf("real(complex128(r52)-1) = %g, want %g", got, f52want)
}
if got := real(r53 - 1); got != f53want {
t.Errorf("real(r53-1) = %g, want %g", got, f53want)
}
if got := real(complex128(r53) - 1); got != 0 {
t.Errorf("real(complex128(r53)-1) = %g, want 0", got)
}
const i52 = complex(0, 1+1.0/(1<<52))
const i53 = complex(0, 1+1.0/(1<<53))
if got := imag(i52 - 1i); got != f52want {
t.Errorf("imag(i52-1i) = %g, want %g", got, f52want)
}
if got := imag(complex128(i52) - 1i); got != f52want {
t.Errorf("imag(complex128(i52)-1i) = %g, want %g", got, f52want)
}
if got := imag(i53 - 1i); got != f53want {
t.Errorf("imag(i53-1i) = %g, want %g", got, f53want)
}
if got := imag(complex128(i53) - 1i); got != 0 {
t.Errorf("imag(complex128(i53)-1i) = %g, want 0", got)
}
}
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