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cmd/compile: clarify unsigned interpretation of AuxInt

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The way Value.AuxInt represents unsigned numbers is currently
documented in genericOps.go, which is not the most obvious place for
it. Move that documentation to Value.AuxInt. Furthermore, to make it
harder to use incorrectly, introduce a Value.AuxUnsigned accessor that
returns the zero-extended value of Value.AuxInt.

Change-Id: I85030c3c68761404058a430e0b1c7464591b2f42
Reviewed-on: https://go-review.googlesource.com/102597
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Austin Clements 2018-03-25 12:20:57 -04:00
parent a29e25b82c
commit 2d8181e7b5
3 changed files with 25 additions and 14 deletions
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2
src/cmd/compile/internal/ssa/gen/genericOps.go
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@ -17,8 +17,6 @@ package main
// all args take signed inputs, or don't care whether their inputs
// are signed or unsigned.
// Unused portions of AuxInt are filled by sign-extending the used portion.
// Users of AuxInt which interpret AuxInt as unsigned (e.g. shifts) must be careful.
var genericOps = []opData{
// 2-input arithmetic
// Types must be consistent with Go typing. Add, for example, must take two values