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This will let low-level things depend on the canonical routines,
even for floating-point printing.
Change-Id: I31207dc6584ad90d4e365dbe6eaf20f8662ed22d
Reviewed-on: https://go-review.googlesource.com/c/go/+/716000
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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Change-Id: Ifa3c022ad5453301573593a3d05e7b1d42b931ff
GitHub-Last-Rev: a7468b068b5c7bcaa573042cf9d5c2732c0385f1
GitHub-Pull-Request: golang/go#67167
Reviewed-on: https://go-review.googlesource.com/c/go/+/583215
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Change-Id: Iad58155f29a101fb72768b170c0c2c9d76b6041a
Reviewed-on: https://go-review.googlesource.com/c/go/+/539357
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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When one has a []byte on hand, but desires to call the Parse functions,
the conversion from []byte to string would allocate.
var b []byte = ...
v, err := strconv.ParseXXX(string(b), ...)
This changes it such that the input string never escapes from
any of the Parse functions. Together with the compiler optimization
where the compiler stack allocates any string smaller than 32B
this makes most valid inputs for strconv.ParseXXX(string(b), ...)
not require an allocation for the input string.
For example, the longest int64 or uint64 encoded in decimal is 20B.
Also, the longest decimal formatting of a float64 in appendix B
of RFC 8785 is 25B.
Previously, this was not possible since the input leaked to the error,
which causes the prover to give up and instead heap copy the []byte.
We fix this by copying the input string in the error case.
The advantage of this change is that you can now call strconv.ParseXXX
with a []byte without allocations (most times) in the non-error case.
The detriment is that the error-case now has an extra allocation.
We should optimize for the non-error path, rather than the error path.
The effects of this change is transitively seen through packages
that must use strconv.ParseXXX on a []byte such as "encoding/json":
name old time/op new time/op delta
UnmarshalFloat64 186ns 157ns -15.89% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
UnmarshalFloat64 148B 144B -2.70% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
UnmarshalFloat64 2.00 1.00 -50.00% (p=0.000 n=10+10)
In order for "encoding/json" to benefit, there needs to be a
small change made to how "encoding/json" calls strconv.ParseXXX.
That will be a future change.
Credit goes to Jeff Wendling for a similar patch.
Fixes #42429
Change-Id: I512d6927f965f82e95bd7ec14a28a587f23b7203
Reviewed-on: https://go-review.googlesource.com/c/go/+/345488
Reviewed-by: Martin Möhrmann <martin@golang.org>
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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This is a partial revert of https://go-review.googlesource.com/c/go/+/248219
because we found that a non-trivial amount of code erroneously calls
ParseFloat(s, 10) or even ParseFloat(s, 0) and expects it to work --
before that change was merged, ParseFloat accepted a bitSize of
anything other than 32 or 64 to mean 64 (and ParseComplex was similar).
So revert that behavior to avoid breaking people's code, and add tests
for this.
I may add a vet check to flag ParseFloat(s, not_32_or_64) in a later
change.
See #42297 for more details.
Change-Id: I4bc0156bd74f67a39d5561b6e5fde3f2d20bd622
Reviewed-on: https://go-review.googlesource.com/c/go/+/267319
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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In ParseComplex, the "size" passed to parseFloatPrefix should be 64 for
complex128, not 128. It still works because of how parseFloatPrefix
is forgiving about the size if it's not 32, but worth fixing anyway.
Make ParseComplex and ParseFloat return a bit size error for anything
other than 128 or 64 (for ParseComplex), or 64 or 32 (for ParseFloat).
Add "InvalidBitSize" tests for these cases.
Add tests for ParseComplex with bitSize==64: this is done in a similar
way to how the ParseFloat 32-bit tests work, re-using the tests for the
larger bit size.
Add tests for FormatComplex -- there were none before.
Fixes #40706
Change-Id: I16ddd546e5237207cc3b8c2181dd708eca42b04f
Reviewed-on: https://go-review.googlesource.com/c/go/+/248219
Run-TryBot: Robert Griesemer <gri@golang.org>
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Trust: Minux Ma <minux@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
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Adds two functions to deal with complex numbers:
* FormatComplex
* ParseComplex
ParseComplex accepts complex numbers in this format: N+Ni
Fixes #36771
Change-Id: Id184dc9e277e5fa01a714ad656a88255ead05085
GitHub-Last-Rev: 036a075d36363774a95f6000b7c4098896474744
GitHub-Pull-Request: golang/go#36815
Reviewed-on: https://go-review.googlesource.com/c/go/+/216617
Reviewed-by: Robert Griesemer <gri@golang.org>
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