| // 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 gc |
| |
| 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) |
| } |
| |
| } |
