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cmd/compile: disable use of new saturating float-to-int conversions

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The new conversions can be activated (or bisected) with
  -gcflags=all=-d=converthash=PATTERN

where PATTERN is either a hash string or n, qn, y, qy for
no, quietly no, yes, quietly yes.

This CL makes the default pattern be "qn" instead of the
default-default which is an efficient encoding of "qy".

Updates #75834

Change-Id: I88a9fd7880bc999132420c8d0a22a8fdc1e95a2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/711845
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Bypass: David Chase <drchase@google.com>
This commit is contained in:
David Chase 2025-10-14 16:18:49 -04:00
parent 6d5b13793f
commit 7056c71d32
3 changed files with 5 additions and 2 deletions
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3
src/cmd/compile/internal/base/flag.go
View file

@ -264,6 +264,9 @@ func ParseFlags() {
if Debug.Converthash != "" {
ConvertHash = NewHashDebug("converthash", Debug.Converthash, nil)
} else {
// quietly disable the convert hash changes
ConvertHash = NewHashDebug("converthash", "qn", nil)
}
if Debug.Fmahash != "" {
FmaHash = NewHashDebug("fmahash", Debug.Fmahash, nil)

2
test/codegen/math.go
View file

@ -1,4 +1,4 @@
// asmcheck
// asmcheck -gcflags=-d=converthash=qy
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style

2
test/convert5.go
View file

@ -1,4 +1,4 @@
// run
// run -gcflags=-d=converthash=qy
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style