1 // run 2 3 // Copyright 2014 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 // Issue 7044: bad AMOVFD and AMOVDF assembly generation on 8 // arm for registers above 7. 9 10 package main 11 12 import ( 13 "fmt" 14 "reflect" 15 ) 16 17 func f() [16]float32 { 18 f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14, f15 := 19 float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1), float32(1) 20 // Use all 16 registers to do float32 --> float64 conversion. 21 d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12, d13, d14, d15 := 22 float64(f0), float64(f1), float64(f2), float64(f3), float64(f4), float64(f5), float64(f6), float64(f7), float64(f8), float64(f9), float64(f10), float64(f11), float64(f12), float64(f13), float64(f14), float64(f15) 23 // Use all 16 registers to do float64 --> float32 conversion. 24 g0, g1, g2, g3, g4, g5, g6, g7, g8, g9, g10, g11, g12, g13, g14, g15 := 25 float32(d0), float32(d1), float32(d2), float32(d3), float32(d4), float32(d5), float32(d6), float32(d7), float32(d8), float32(d9), float32(d10), float32(d11), float32(d12), float32(d13), float32(d14), float32(d15) 26 // Force another conversion, so that the previous conversion doesn't 27 // get optimized away into constructing the returned array. With current 28 // optimizations, constructing the returned array uses only 29 // a single register. 30 e0, e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14, e15 := 31 float64(g0), float64(g1), float64(g2), float64(g3), float64(g4), float64(g5), float64(g6), float64(g7), float64(g8), float64(g9), float64(g10), float64(g11), float64(g12), float64(g13), float64(g14), float64(g15) 32 return [16]float32{ 33 float32(e0), float32(e1), float32(e2), float32(e3), float32(e4), float32(e5), float32(e6), float32(e7), float32(e8), float32(e9), float32(e10), float32(e11), float32(e12), float32(e13), float32(e14), float32(e15), 34 } 35 } 36 37 func main() { 38 want := [16]float32{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} 39 got := f() 40 if !reflect.DeepEqual(got, want) { 41 fmt.Printf("f() = %#v; want %#v\n", got, want) 42 } 43 } 44
