mirror of https://github.com/golang/go.git
a46ecdca36
When an opcode generates a known high bit state (typically, a sub-word operation that zeros the high bits), we can remove any subsequent extension operation that would be a no-op. x = (OP ...) y = (ZeroExt32to64 x) If OP zeros the high 32 bits, then we can replace y with x, as the zero extension doesn't do anything. However, x in this situation normally has a sub-word-sized type. The semantics of values in registers is typically that the high bits beyond the value's type size are junk. So although the opcode generating x *currently* zeros the high bits, after x is rewritten to another opcode it may not - rewrites of sub-word-sized values can trash the high bits. To fix, move the extension-removing rules to late lower. That ensures that their arguments won't be rewritten to change their high bits. I am also worried about spilling and restoring. Spilling and restoring doesn't preserve the high bits, but instead sets them to a known value (often 0, but in some cases it could be sign-extended). I am unable to come up with a case that would cause a problem here, so leaving for another time. Fixes #66066 Change-Id: I3b5c091b3b3278ccbb7f11beda8b56f4b6d3fde7 Reviewed-on: https://go-review.googlesource.com/c/go/+/568616 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
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README.md
The test directory contains tests of the Go tool chain and runtime. It includes black box tests, regression tests, and error output tests. They are run as part of all.bash.
To run just these tests, execute:
../bin/go test cmd/internal/testdir
To run just tests from specified files in this directory, execute:
../bin/go test cmd/internal/testdir -run='Test/(file1.go|file2.go|...)'
Standard library tests should be written as regular Go tests in the appropriate package.
The tool chain and runtime also have regular Go tests in their packages. The main reasons to add a new test to this directory are:
- it is most naturally expressed using the test runner; or
- it is also applicable to
gccgoand other Go tool chains.