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// Copyright 2019 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 glob = 3
var globp *int64
// Testing compilation of arch.ZeroRange of various sizes.
// By storing a pointer to an int64 output param in a global, the compiler must
// ensure that output param is allocated on the heap. Also, since there is a
// defer, the pointer to each output param must be zeroed in the prologue (see
// plive.go:epilogue()). So, we will get a block of one or more stack slots that
// need to be zeroed. Hence, we are testing compilation completes successfully when
// zerorange calls of various sizes (8-136 bytes) are generated. We are not
// testing runtime correctness (which is hard to do for the current uses of
// ZeroRange).
func TestZeroRange(t *testing.T) {
testZeroRange8(t)
testZeroRange16(t)
testZeroRange32(t)
testZeroRange64(t)
testZeroRange136(t)
}
func testZeroRange8(t *testing.T) (r int64) {
defer func() {
glob = 4
}()
globp = &r
return
}
func testZeroRange16(t *testing.T) (r, s int64) {
defer func() {
glob = 4
}()
globp = &r
globp = &s
return
}
func testZeroRange32(t *testing.T) (r, s, t2, u int64) {
defer func() {
glob = 4
}()
globp = &r
globp = &s
globp = &t2
globp = &u
return
}
func testZeroRange64(t *testing.T) (r, s, t2, u, v, w, x, y int64) {
defer func() {
glob = 4
}()
globp = &r
globp = &s
globp = &t2
globp = &u
globp = &v
globp = &w
globp = &x
globp = &y
return
}
func testZeroRange136(t *testing.T) (r, s, t2, u, v, w, x, y, r1, s1, t1, u1, v1, w1, x1, y1, z1 int64) {
defer func() {
glob = 4
}()
globp = &r
globp = &s
globp = &t2
globp = &u
globp = &v
globp = &w
globp = &x
globp = &y
globp = &r1
globp = &s1
globp = &t1
globp = &u1
globp = &v1
globp = &w1
globp = &x1
globp = &y1
globp = &z1
return
}
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