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cmd/compile: update comment about OpPhi argLength 

We use -1 for Phi argLength, not "a really large number".

Change-Id: I5d4fa364c22c3cf40213f2368a9a20de7e989aac
Reviewed-on: https://go-review.googlesource.com/c/go/+/203883
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2019-10-28 08:32:06 -07:00
parent 18e9cdc70e
commit e071cc4873
1 changed files with 1 additions and 2 deletions
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3
src/cmd/compile/internal/ssa/gen/genericOps.go
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@ -316,8 +316,7 @@ var genericOps = []opData{
// See section 7.2 in ieee754.
{name: "Fma", argLength: 3}, // compute (a*b)+c without intermediate rounding
// Data movement, max argument length for Phi is indefinite so just pick
// a really large number
// Data movement. Max argument length for Phi is indefinite.
{name: "Phi", argLength: -1, zeroWidth: true}, // select an argument based on which predecessor block we came from
{name: "Copy", argLength: 1}, // output = arg0
// Convert converts between pointers and integers.