mirror of
https://github.com/golang/go
synced 2024-11-24 16:50:13 -07:00
[dev.ssa] test: add test of pointer aliasing
This adds a test case with aliased pointers to ensure modifications to dse don't remove valid stores. Change-Id: I143653250f46a403835218ec685bcd336d5087ef Reviewed-on: https://go-review.googlesource.com/19795 Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
parent
5949524fc4
commit
4827c6d077
@ -123,7 +123,26 @@ func testg() {
|
||||
}
|
||||
}
|
||||
|
||||
func alias_ssa(ui64 *uint64, ui32 *uint32) uint32 {
|
||||
*ui32 = 0xffffffff
|
||||
*ui64 = 0 // store
|
||||
ret := *ui32 // load from same address, should be zero
|
||||
*ui64 = 0xffffffffffffffff // store
|
||||
return ret
|
||||
}
|
||||
func testdse() {
|
||||
x := int64(-1)
|
||||
// construct two pointers that alias one another
|
||||
ui64 := (*uint64)(unsafe.Pointer(&x))
|
||||
ui32 := (*uint32)(unsafe.Pointer(&x))
|
||||
if want, got := uint32(0), alias_ssa(ui64, ui32); got != want {
|
||||
fmt.Printf("alias_ssa: wanted %d, got %d\n", want, got)
|
||||
panic("alias_ssa")
|
||||
}
|
||||
}
|
||||
|
||||
func main() {
|
||||
testf()
|
||||
testg()
|
||||
testdse()
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user