test/codegen: tighten the TrailingZeros64 test on 386

Make the TrailingZeros64 code generation check more specific for 386.
Just checking for BSFL will match both the generic 64 bit decomposition
and the custom 386 lowering.

Change-Id: I62076f1889af0ef1f29704cba01ab419cae0c6e3
Reviewed-on: https://go-review.googlesource.com/c/go/+/656996
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>

diff --git a/test/codegen/mathbits.go b/test/codegen/mathbits.go
index 78556c636f85963f95f9be91a7bce3384e7d6427..1cee39283d73a1a12d7e82c96bcbcef99538700a 100644 (file)
--- a/test/codegen/mathbits.go
+++ b/test/codegen/mathbits.go
@@ -372,7 +372,7 @@ func TrailingZeros(n uint) int {
 func TrailingZeros64(n uint64) int {
        // amd64/v1,amd64/v2:"BSFQ","MOVL\t\\$64","CMOVQEQ"
        // amd64/v3:"TZCNTQ"
-       // 386:"BSFL"
+       // 386:"BSFL","JNE"
        // arm64:"RBIT","CLZ"
        // loong64:"CTZV"
        // s390x:"FLOGR"