This enables efficient use of the builtin min/max function
for float64 and float32 types on GOPPC64 >= power9.
Extend the assembler to support xsminjdp/xsmaxjdp and use
them to implement float min/max.
Simplify the VSX xx3 opcode rules to allow FPR arguments,
if all arguments are an FPR.
Change-Id: I15882a4ce5dc46eba71d683cf1d184dc4236a328
Reviewed-on: https://go-review.googlesource.com/c/go/+/574535
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
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Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This reverts CL 553055.
Reason for revert: causes crypto/ecdsa failures on linux ppc64/s390x builders
Change-Id: I9266b030693a5b6b1e667a009de89d613755b048
Reviewed-on: https://go-review.googlesource.com/c/go/+/575236
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Preliminary compiler support for merging/overlapping stack
slots of local variables whose access patterns are disjoint.
This patch includes changes in AllocFrame to do the actual
merging/overlapping based on information returned from a new
liveness.MergeLocals helper. The MergeLocals helper identifies
candidates by looking for sets of AUTO variables that either A) have
the same size and GC shape (if types contain pointers), or B) have the
same size (but potentially different types as long as those types have
no pointers). Variables must be greater than (3*types.PtrSize) in size
to be considered for merging.
After forming candidates, MergeLocals collects variables into "can be
overlapped" equivalence classes or partitions; this process is driven
by an additional liveness analysis pass. Ideally it would be nice to
move the existing stackmap liveness pass up before AllocFrame
and "widen" it to include merge candidates so that we can do just a
single liveness as opposed to two passes, however this may be difficult
given that the merge-locals liveness has to take into account
writes corresponding to dead stores.
This patch also required a change to the way ssa.OpVarDef pseudo-ops
are generated; prior to this point they would only be created for
variables whose type included pointers; if stack slot merging is
enabled then the ssagen code creates OpVarDef ops for all auto vars
that are merge candidates.
Note that some temporaries created late in the compilation process
(e.g. during ssa backend) are difficult to reason about, especially in
cases where we take the address of a temp and pass it to the runtime.
For the time being we mark most of the vars created post-ssagen as
"not a merge candidate".
Stack slot merging for locals/autos is enabled by default if "-N" is
not in effect, and can be disabled via "-gcflags=-d=mergelocals=0".
Fixmes/todos/restrictions:
- try lowering size restrictions
- re-evaluate the various skips that happen in SSA-created autotmps
Fixes#62737.
Updates #65532.
Updates #65495.
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest
Change-Id: Ibc22e8a76c87e47bc9fafe4959804d9ea923623d
Reviewed-on: https://go-review.googlesource.com/c/go/+/553055
Reviewed-by: Cherry Mui <cherryyz@google.com>
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This reverts CL 575175.
Reason for revert: causes crypto/ecdh failures on longtest builders.
Change-Id: Ieed326fedf91760ac73095a42ba0237cf969843b
Reviewed-on: https://go-review.googlesource.com/c/go/+/575316
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Auto-Submit: Than McIntosh <thanm@google.com>
CL 395541 made staticopy safe, stop applying the optimization once
seeing an expression that may modify global variables.
However, if a call expression was inlined, the analyzer mis-recognizes
and think that the expression is safe. For example:
var x = 0
var a = f()
var b = x
are re-written to:
var x = 0
var a = ~r0
var b = 0
even though it's not safe because "f()" may modify "x".
Fixing this by recognizing OINLCALL and mark the initialization as
not safe for staticopy.
Fixes#66585
Change-Id: Id930c0b7e74274195f54a498cc4c5a91c4e6d84d
Reviewed-on: https://go-review.googlesource.com/c/go/+/575175
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>
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For https://gcc.gnu.org/PR114453
Change-Id: If41d9fca6288b18ed47b0f21ff224c74ddb34958
Reviewed-on: https://go-review.googlesource.com/c/go/+/574536
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Partial typo corrections, following https://go.dev/wiki/Spelling
Change-Id: I2357906ff2ea04305c6357418e4e9556e20375d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/573776
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Auto-Submit: Ian Lance Taylor <iant@google.com>
Change-Id: I0f67801ef2d3af65c39a27b8db6ebaa769ff7f92
GitHub-Last-Rev: feb7f79ea5
GitHub-Pull-Request: golang/go#66508
Reviewed-on: https://go-review.googlesource.com/c/go/+/574075
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Because issue #47631 has been fixed, remove TODO.
Change-Id: Ic476616729f47485a18a5145bd28c87dd18b4492
Reviewed-on: https://go-review.googlesource.com/c/go/+/573775
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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Remove dynamic checks for atomic instructions for ARM64 targets that support LSE extension.
For #66131
Change-Id: I0ec1b183a3f4ea4c8a537430646e6bc4b4f64271
Reviewed-on: https://go-review.googlesource.com/c/go/+/569536
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Fannie Zhang <Fannie.Zhang@arm.com>
Reviewed-by: Shu-Chun Weng <scw@google.com>
Constant bools are like constant 1-byte values, they memcombine just fine.
(There are still trickier cases that this pass doesn't catch
yet, see TODO at memcombine.go:503.)
Fixes#66413
Change-Id: Ia67cf72ed1c416e27ac22da443bd88a3f09a6cc8
Reviewed-on: https://go-review.googlesource.com/c/go/+/573416
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Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
On amd64, we always zero-extend when loading arguments from the stack.
On arm64, we extend based on the type. This causes problems with
zeroUpper*Bits, which reports the top bits are zero when they aren't.
Fix it to use the type to decide if the top bits are really zero.
For tests, only f32 currently fails on arm64. Added other tests
just for future-proofing.
Update #66066
Change-Id: I2f13fb47198e139ef13c9a34eb1edc932eea3ee3
Reviewed-on: https://go-review.googlesource.com/c/go/+/571135
Reviewed-by: Keith Randall <khr@google.com>
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Reviewed-by: David Chase <drchase@google.com>
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Use `' quotes (as in `foo') to differentiate from Go quotes.
Quoting prevents confusion when user-supplied names alter
the meaning of the error message.
For instance, report
duplicate method `wanted'
rather than
duplicate method wanted
Exceptions:
- don't quote _:
`_' is ugly and not necessary
- don't quote after a ":":
undefined name: foo
- don't quote if the name is used correctly in a statement:
goto L jumps over variable declaration
Quoting is done with a helper function and can be centrally adjusted
and fine-tuned as needed.
Adjusted some test cases to explicitly include the quoted names.
Fixes#65790.
Change-Id: Icce667215f303ab8685d3e5cb00d540a2fd372ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/571396
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Auto-Submit: Robert Griesemer <gri@google.com>
This usage shows up in quite a few places, and helps reduce
register pressure in several complex cryto functions by
removing a MOVD $0,... instruction.
Change-Id: I9444ea8f9d19bfd68fb71ea8dc34e109681b3802
Reviewed-on: https://go-review.googlesource.com/c/go/+/571055
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Still investigating, but adding the minimized reproducer as a regress
test case for now.
Updates #66261.
Change-Id: I20715b731f8c5b95616513d4a13e3ae083709031
Reviewed-on: https://go-review.googlesource.com/c/go/+/571815
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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For GOPPC64 < 10 targets, most large 32 bit constants (those
exceeding int16 capacity) can be added using two instructions
instead of 3.
This cannot be done for values greater than 0x7FFF7FFF, so this
must be done during asm preprocessing as the optab matching
rules cannot differentiate this special case.
Likewise, constants 0x8000 <= x < 0x10000 are not converted. The
assembler currently generates 2 instructions sequences for these
constants.
Change-Id: I1ccc839c6c28fc32f15d286b2e52e2d22a2a06d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/568116
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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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>
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CL 541715 added an optimization to copy SSA-able variables.
When handling m[k] = append(m[k], ...) case, it uses ir.SameSafeExpr to
check that m[k] expressions are the same, then doing type assertion to
convert the map index to ir.IndexExpr node. However, this assertion is
not safe for m[k] expression in append(m[k], ...), since it may be
wrapped by ir.OCONVNOP node.
Fixing this by un-wrapping any ir.OCONVNOP before doing type assertion.
Fixes#66096
Change-Id: I9ff7165ab97bc7f88d0e9b7b31604da19a8ca206
Reviewed-on: https://go-review.googlesource.com/c/go/+/569716
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Provide and use rotation pseudo-instructions for riscv64. The RISC-V bitmanip
extension adds support for hardware rotation instructions in the form of ROL,
ROLW, ROR, RORI, RORIW and RORW. These are easily implemented in the assembler
as pseudo-instructions for CPUs that do not support the bitmanip extension.
This approach provides a number of advantages, including reducing the rewrite
rules needed in the compiler, simplifying codegen tests and most importantly,
allowing these instructions to be used in assembly (for example, riscv64
optimised versions of SHA-256 and SHA-512). When bitmanip support is added,
these instruction sequences can simply be replaced with a single instruction
if permitted by the GORISCV64 profile.
Change-Id: Ia23402e1a82f211ac760690deb063386056ae1fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/565015
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Run-TryBot: Joel Sing <joel@sing.id.au>
The problem was caused by faulty handling of unSSA-able
operations on zero-sized data in expand calls, but there
is no point to operations on zero-sized data. This CL adds
a simplify step to the first place in SSA where all values
are processed and replaces anything producing a 0-sized
struct/array with the corresponding Struct/Array Make0
operation (of the appropriate type).
I attempted not generating them in ssagen, but that was a
larger change, and also had bugs. This is simple and obvious.
The only question is whether it would be worthwhile to do it
earlier (in numberlines or phielem).
Fixes#65808.
Change-Id: I0a596b3d272798015e7bb6b1a20411241759fe0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/568258
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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Currently we use pointer equality on types when deciding whether we can
reuse a stack slot. That's too strict, as we don't guarantee pointer
equality for the same type. In particular, it can vary based on whether
PtrTo has been called in the frontend or not.
Instead, use the type's LinkString, which is guaranteed to both be
unique for a type, and to not vary given two different type structures
describing the same type.
Update #65783
Change-Id: I64f55138475f04bfa30cfb819b786b7cc06aebe4
Reviewed-on: https://go-review.googlesource.com/c/go/+/565436
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
The itab we're initializing again, just to figure out which method
is missing, might be stored in read-only memory.
This can only happen in certain weird generics situations, so it is
pretty rare, but it causes a runtime crash when it does happen.
Fixes#65962
Change-Id: Ia86e216fe33950a794ad8e475e76317f799e9136
Reviewed-on: https://go-review.googlesource.com/c/go/+/567615
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Keith Randall <khr@google.com>
When the compiler writes PtrToThis field of noalg type, it generates
its pointer type. Mark them as noalg to prevent put them in typelinks.
Fixes#65957
Change-Id: Icbc3b18bc866f9138c7648e42dd500a80326f72b
Reviewed-on: https://go-review.googlesource.com/c/go/+/567335
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Keith Randall <khr@google.com>
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Change-Id: I39af932b789cd18dc4bfc84f9667b1c32c9825f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/567476
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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CL 517775 moved early deadcode into unified writer. with new way to
handle dead code with label statement involved: any statements after
terminating statement will be considered dead until next label
statement.
However, this is not safe, because code after label statement may still
refer to dead statements between terminating and label statement.
It's only safe to remove statements after terminating *and* label one.
Fixes#65593
Change-Id: Idb630165240931fad50789304a9e4535f51f56e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/565596
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Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Use quotes to wrap user-supplied token in the syntax error message.
Updates #65790
Change-Id: I631a63df4a6bb8615b7850a324d812190bc15f30
GitHub-Last-Rev: f291e1d5a6
GitHub-Pull-Request: golang/go#65840
Reviewed-on: https://go-review.googlesource.com/c/go/+/565518
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
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types2 handles all constant-related bounds checks in user Go code now,
so it's safe to remove the check from typecheck, avoid the inconsistency
with type parameter.
Fixes#65417
Change-Id: I82dd197b78e271725d132b5a20450ae3e90f9abc
Reviewed-on: https://go-review.googlesource.com/c/go/+/560575
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Enable canRotate for riscv64, enable rotation intrinsics and provide
better rewrite implementations for rotations. By avoiding Lsh*x64
and Rsh*Ux64 we can produce better code, especially for 32 and 64
bit rotations. By enabling canRotate we also benefit from the generic
rotation rewrite rules.
Benchmark on a StarFive VisionFive 2:
│ rotate.1 │ rotate.2 │
│ sec/op │ sec/op vs base │
RotateLeft-4 14.700n ± 0% 8.016n ± 0% -45.47% (p=0.000 n=10)
RotateLeft8-4 14.70n ± 0% 10.69n ± 0% -27.28% (p=0.000 n=10)
RotateLeft16-4 14.70n ± 0% 12.02n ± 0% -18.23% (p=0.000 n=10)
RotateLeft32-4 13.360n ± 0% 8.016n ± 0% -40.00% (p=0.000 n=10)
RotateLeft64-4 13.360n ± 0% 8.016n ± 0% -40.00% (p=0.000 n=10)
geomean 14.15n 9.208n -34.92%
Change-Id: I1a2036fdc57cf88ebb6617eb8d92e1d187e183b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/560315
Reviewed-by: M Zhuo <mengzhuo1203@gmail.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
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Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
This CL separates the pass that computes inlinability from the pass
that performs inlinability. In particular, the latter can now happen
in any flat order, rather than bottom-up order. This also allows
inlining of calls exposed by devirtualization.
Change-Id: I389c0665fdc8288a6e25129a6744bfb1ace1eff7
Reviewed-on: https://go-review.googlesource.com/c/go/+/562319
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Reviewed-by: Than McIntosh <thanm@google.com>
As CL 514596 and CL 514775 adds hardware implement of float
max/min, we should add codegen test for these two CL.
Change-Id: I347331032fe9f67a2e6fdb5d3cfe20203296b81c
Reviewed-on: https://go-review.googlesource.com/c/go/+/561295
Reviewed-by: Joel Sing <joel@sing.id.au>
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Reviewed-by: David Chase <drchase@google.com>
This CL improves the error messages reported when a field or method
name is used that doesn't exist. It brings the error messges on par
(or better) with the respective errors reported before Go 1.18 (i.e.
before switching to the new type checker):
Make case distinctions based on whether a field/method is exported
and how it is spelled. Factor out that logic into a new function
(lookupError) in a new file (errsupport.go), which is generated for
go/types. Use lookupError when reporting selector lookup errors
and missing struct field keys.
Add a comprehensive set of tests (lookup2.go) and spot tests for
the two cases brought up by the issue at hand.
Adjusted existing tests as needed.
Fixes#49736.
Change-Id: I2f439948dcd12f9bd1a258367862d8ff96e32305
Reviewed-on: https://go-review.googlesource.com/c/go/+/560055
Run-TryBot: Robert Griesemer <gri@google.com>
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Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Rather than implementing a new, less complete mechanism to check
if a selector exists with different capitalization, use the
existing mechanism in lookupFieldOrMethodImpl by making it
available for internal use.
Pass foldCase parameter all the way trough to Object.sameId and
thus make it consistently available where Object.sameId is used.
From sameId, factor out samePkg functionality into stand-alone
predicate.
Do better case distinction when reporting an error for an undefined
selector expression.
Cleanup.
Change-Id: I7be3cecb4976a4dce3264c7e0c49a320c87101e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/558315
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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This do:
- Fold always false or always true comparisons for ints and uint.
- Reduce < and <= where the true set is only one value to == with such value.
Change-Id: Ie9e3f70efd1845bef62db56543f051a50ad2532e
Reviewed-on: https://go-review.googlesource.com/c/go/+/555135
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
The input index to a jump table can be out of range for unreachable code.
Dynamically the compiler ensures that an out-of-range index can never
reach a jump table, but that guarantee doesn't extend to the static
realm.
Fixes#64826
Change-Id: I5829f3933ae5124ffad8337dfd7dd75e67a8ec33
Reviewed-on: https://go-review.googlesource.com/c/go/+/552055
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Per the discussion on the issue, since no problems related to this
appeared since Go 1.20, remove the ability to disable the check for
anonymous interface cycles permanently.
Adjust various tests accordingly.
For #56103.
Change-Id: Ica2b28752dca08934bbbc163a9b062ae1eb2a834
Reviewed-on: https://go-review.googlesource.com/c/go/+/550896
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Add a skip for this test that effectively disables it for 32-bit platforms,
so as to not run into timeouts or OOMs on smaller machines.
Fixes#64789.
Change-Id: I2d428e1dccae62b8bb1a69c5f95699692a282bbb
Reviewed-on: https://go-review.googlesource.com/c/go/+/550975
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Right shifts, for some odd reasons, can encode shifts of constant
1-32 instead of 0-31. Left shifts, however, can encode shifts 0-31.
When the shift amount is 0, arm recommends encoding right shifts
using left shifts.
Fixes#64715
Change-Id: Id3825349aa7195028037893dfe01fa0e405eaa51
Reviewed-on: https://go-review.googlesource.com/c/go/+/549955
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Keith Randall <khr@google.com>
This commit is aimed at improving the readability and consistency
of the code base. Extraneous newline characters were present after
some return statements, creating unnecessary separation in the code.
Fixes#64610
Change-Id: Ic1b05bf11761c4dff22691c2f1c3755f66d341f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/548316
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
We can't delete all the outgoing edges and then add one back in, because
then we've lost the argument of any phi at the target. Instead, move
the important target to the front of the list and delete the rest.
This normally isn't a problem, because there is never normally a phi
at the target of a jump table. But this isn't quite true when in race
build mode, because there is a phi of the result of a bunch of raceread
calls.
The reason this happens is that each case is written like this (where e
is the runtime.eface we're switching on):
if e.type == $type.int32 {
m = raceread(e.data, m1)
}
m2 = phi(m1, m)
if e.type == $type.int32 {
.. do case ..
goto blah
}
so that if e.type is not $type.int32, it falls through to the default
case. This default case will have a memory phi for all the (jumped around
and not actually called) raceread calls.
If we instead did it like
if e.type == $type.int32 {
raceread(e.data)
.. do case ..
goto blah
}
That would paper over this bug, as it is the only way to construct
a jump table whose target is a block with a phi in it. (Yet.)
But we'll fix the underlying bug in this CL. Maybe we can do the
rewrite mentioned above later. (It is an optimization for -race mode,
which isn't particularly important.)
Fixes#64606
Change-Id: I6f6e3c90eb1e2638112920ee2e5b6581cef04ea4
Reviewed-on: https://go-review.googlesource.com/c/go/+/548356
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
When I was plumbing min/max support through the compiler, I was
thinking mostly about numeric argument types. As a result, I forgot
that escape analysis would need to be aware that min/max can operate
on string values, which contain pointers.
Fixes#64565.
Change-Id: I36127ce5a2da942401910fa0f9de922726c9f94d
Reviewed-on: https://go-review.googlesource.com/c/go/+/547715
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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The code generation on riscv64 will currently result in incorrect
assembly when a 32 bit integer is right shifted by an amount that
exceeds the size of the type. In particular, this occurs when an
int32 or uint32 is cast to a 64 bit type and right shifted by a
value larger than 31.
Fix this by moving the SRAW/SRLW conversion into the right shift
rules and removing the SignExt32to64/ZeroExt32to64. Add additional
rules that rewrite to SRAIW/SRLIW when the shift is less than the
size of the type, or replace/eliminate the shift when it exceeds
the size of the type.
Add SSA tests that would have caught this issue. Also add additional
codegen tests to ensure that the resulting assembly is what we
expect in these overflow cases.
Fixes#64285
Change-Id: Ie97b05668597cfcb91413afefaab18ee1aa145ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/545035
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: M Zhuo <mzh@golangcn.org>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Gopher Robot <gobot@golang.org>
With range over int, the rune literal in range expression will be left
as untyped rune, but idealType is not handling this case, causing ICE.
Fixing this by setting the concrete type for untyped rune expresison.
Fixes#64471
Change-Id: I07a151c54ea1d9e1b92e4d96cdfb6e73dca13862
Reviewed-on: https://go-review.googlesource.com/c/go/+/546296
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
The shift amounts were wrong in this case, leading to miscompilation
of load combining.
Also the store combining was not triggering when it should.
Fixes#64468
Change-Id: Iaeb08972c5fc1d6f628800334789c6af7216e87b
Reviewed-on: https://go-review.googlesource.com/c/go/+/546355
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
order.go ensures expressions that are passed to the runtime by address
are in fact addressable. However, in the case of local variables, if the
variable hasn't already been marked as addrtaken, then taking its
address here will effectively prevent the variable from being converted
to SSA form.
Instead, it's better to just copy the variable into a new temporary,
which we can pass by address instead. This ensures the original variable
can still be converted to SSA form.
Fixes#63332.
Change-Id: I182376d98d419df8bf07c400d84c344c9b82c0fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/541715
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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