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cmd/compile: test for correct zeroing 

Make sure we generate the right code for zeroing a structure.

Check in after Matthew's CL (34564).

Update #18370

Change-Id: I987087f979d99227a880b34c44d9d4de6c25ba0c
Reviewed-on: https://go-review.googlesource.com/34565
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
This commit is contained in:
Keith Randall 2016-12-19 09:15:04 -08:00
parent 0919fd7068
commit 8d21691044
1 changed files with 13 additions and 0 deletions
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13
src/cmd/compile/internal/gc/asm_test.go
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@ -205,6 +205,19 @@ func f(b []byte, i int) uint32 {
`,
[]string{"\tMOVL\t\\(.*\\)\\(.*\\*1\\),"},
},
// Structure zeroing. See issue #18370.
{"amd64", "linux", `
type T struct {
a, b, c int
}
func f(t *T) {
*t = T{}
}
`,
[]string{"\tMOVQ\t\\$0, \\(.*\\)", "\tMOVQ\t\\$0, 8\\(.*\\)", "\tMOVQ\t\\$0, 16\\(.*\\)"},
},
// TODO: add a test for *t = T{3,4,5} when we fix that.
}
// mergeEnvLists merges the two environment lists such that