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Robert Griesemer 33ac854481 cmd/compile: do not export float or complex constants with -asmhdr
The -asmhdr flag is used to generate header files for assembly code
such that that code has access to compile-time constants. During
the build these constants end up in the (ephemeral) file go_asm.h.

For historical reasons, floating-point and complex constants are
printed with a 'p' exponent but with decimal mantissa; also, because
of the compiler-internal precision of 512 bits, the mantissae are quite
large (and conversions are comparatively slow).

With the changes to the new Go 2 number literals, the respective
upcoming changes to text/scanner (which in turn is used by the assembler)
will make text/scanner newly accept hexadecimal floats; but also decimal
floats using the incorrect 'p' exponent and report an error in that case.

As a consequence, the assembler will report an error when trying to parse
the before-mentioned decimal floating-point values which are using 'p'
exponents. Since these constants are never needed in the assembly code,
do not emit them in the first place.

Change-Id: I06c7c96b04e8d062441120107992472f87a651b2
Reviewed-on: https://go-review.googlesource.com/c/161904
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-02-11 23:25:55 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api api: add os.(*File).SyscallConn to go1.12.txt 2019-01-02 21:21:53 +00:00
doc doc: remove last pieces of advice to set GOROOT 2019-02-10 18:40:06 +00:00
lib/time lib/time: update tzdata to 2018i 2019-01-07 20:14:03 +00:00
misc cmd/cgo: don't copy a simple variable x in &x[0] 2019-02-04 06:53:49 +00:00
src cmd/compile: do not export float or complex constants with -asmhdr 2019-02-11 23:25:55 +00:00
test cmd/compile: accept new Go2 number literals 2019-02-11 23:22:50 +00:00
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: change email address for Elias Naur 2019-01-23 15:05:26 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: second round of updates for Go 1.12 2019-01-30 18:01:19 +00:00
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