cmd/compile: change size diagnostic to use benchmark format

Makes it easier to run

    go build -a -gcflags=-d=export std |& grep ^BenchmarkExportSize

and get useful output for feeding into benchstat.

Change-Id: I2b52e8f5ff33b7ccb6c25b18e464513344bd9ad9
Reviewed-on: https://go-review.googlesource.com/c/go/+/198698
Reviewed-by: Robert Griesemer <gri@golang.org>

diff --git a/src/cmd/compile/internal/gc/export.go b/src/cmd/compile/internal/gc/export.go
index 31e6ab5b6dfd3cef0ea6eb1d978a27d12f2e2c54..44bea2b1fd42b7c11f6e412e9642754803ebacf4 100644 (file)
--- a/src/cmd/compile/internal/gc/export.go
+++ b/src/cmd/compile/internal/gc/export.go
@@ -71,7 +71,7 @@ func dumpexport(bout *bio.Writer) {
        exportf(bout, "\n$$\n")
 
        if Debug_export != 0 {
-               fmt.Printf("export data size = %d bytes\n", size)
+               fmt.Printf("BenchmarkExportSize:%s 1 %d bytes\n", myimportpath, size)
        }
 }