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[dev.cc] doc/go1.5.txt: assembler changes

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Change-Id: Id544d435620efffaf5757dd9d9ebbc6e969a052c
Reviewed-on: https://go-review.googlesource.com/4823
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Rob Pike 2015-02-13 15:12:03 -08:00
parent 69ddb7a408
commit 94d0b380b0
1 changed files with 19 additions and 0 deletions
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doc/go1.5.txt
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@ -31,3 +31,22 @@ sort: number of Sort performance optimizations (https://golang.org/cl/2100, http
strconv: optimize decimal to string conversion (https://golang.org/cl/2105)
math/big: faster assembly kernels for amd64 and 386 (https://golang.org/cl/2503, https://golang.org/cl/2560)
math/big: faster "pure Go" kernels for platforms w/o assembly kernels (https://golang.org/cl/2480)
Assembler:
ARM assembly syntax has had some features removed.
- mentioning SP or PC as a hardware register
These are always pseudo-registers except that in some contexts
they're not, and it's confusing because the context should not affect
which register you mean. Change the references to the hardware
registers to be explicit: R13 for SP, R15 for PC.
- constant creation using assignment
The files say a=b when they could instead say #define a b.
There is no reason to have both mechanisms.
- R(0) to refer to R0.
Some macros use this to a great extent. Again, it's easy just to
use a #define to rename a register.
Also expression evaluation now uses uint64s instead of signed integers and the
precedence of operators is now Go-like rather than C-like.