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cmd/compile/internal/gc: handle arith ops in samesafeexpr

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Teach samesafeexpr to handle arithmetic unary and binary ops.

It makes map lookup optimization possible in

	m[k+1] = append(m[k+1], ...)
	m[-k] = append(m[-k], ...)
	... etc

Does not cover "+" for strings (concatenation).

Change-Id: Ibbb16ac3faf176958da344be1471b06d7cf33a6c
Reviewed-on: https://go-review.googlesource.com/135795
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Iskander Sharipov 2018-09-17 21:37:30 +03:00
parent 9850ad045f
commit c03d0e4fec
2 changed files with 28 additions and 2 deletions
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6
src/cmd/compile/internal/gc/typecheck.go
View File

@ -3298,7 +3298,8 @@ func samesafeexpr(l *Node, r *Node) bool {
case ODOT, ODOTPTR:
return l.Sym != nil && r.Sym != nil && l.Sym == r.Sym && samesafeexpr(l.Left, r.Left)
case OIND, OCONVNOP:
case OIND, OCONVNOP,
ONOT, OCOM, OPLUS, OMINUS:
return samesafeexpr(l.Left, r.Left)
case OCONV:
@ -3306,7 +3307,8 @@ func samesafeexpr(l *Node, r *Node) bool {
// Allow only numeric-ish types. This is a bit conservative.
return issimple[l.Type.Etype] && samesafeexpr(l.Left, r.Left)
case OINDEX, OINDEXMAP:
case OINDEX, OINDEXMAP,
OADD, OSUB, OOR, OXOR, OMUL, OLSH, ORSH, OAND, OANDNOT, ODIV, OMOD:
return samesafeexpr(l.Left, r.Left) && samesafeexpr(l.Right, r.Right)
case OLITERAL:

24
test/codegen/mapaccess.go
View File

@ -304,6 +304,18 @@ func mapAppendAssignmentInt32() {
// arm64:-".*mapaccess"
m[k] = append(m[k], a...)
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[k+1] = append(m[k+1], a...)
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[-k] = append(m[-k], a...)
// Exceptions
// 386:".*mapaccess"
@ -349,6 +361,18 @@ func mapAppendAssignmentInt64() {
// arm64:-".*mapaccess"
m[k] = append(m[k], a...)
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[k+1] = append(m[k+1], a...)
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[-k] = append(m[-k], a...)
// Exceptions
// 386:".*mapaccess"