[dev.cmdgo] all: merge master (67f7e16) into dev.cmdgodev.cmdgo

Merge List:

+ 2021-08-27 67f7e16bcc encoding/gob: optimize decoding of []byte
+ 2021-08-27 2c60a99f72 cmd/compile/internal/syntax: make valid type parameter list in presence of errors
+ 2021-08-27 d350a66532 cmd/compile: eagerly CalcStructSize for synthetic ABI types
+ 2021-08-27 d7e2e2ec2b cmd/compile: delay fillinMethods to deal with mutually-recursive types
+ 2021-08-27 c927599783 cmd/compile: eliminate repetitive code
+ 2021-08-27 62f88b6dc8 cmd/compile: add types.RecalcSize
+ 2021-08-27 e7eee5e265 cmd/compile: remove ssagen/pgen_test.go
+ 2021-08-27 f153b6739b cmd/compile: use typecheck.InitUniverse in unit tests
+ 2021-08-26 967a8017f7 cmd/compile: move types init code into package types
+ 2021-08-26 af80af22b5 cmd/compile/internal/types2: do not declare new methods on instantiated types
+ 2021-08-26 03db2c2413 cmd/compile/internal/types2: implement TypeList.String (debugging support)
+ 2021-08-26 c9e05fdcf7 cmd/compile: fix reference to generic type needed by crawler
+ 2021-08-26 eb6a07fcf9 cmd/compile: unexport Type.Vargen
+ 2021-08-26 3836983779 cmd/compile/internal/types: unexport Type.Extra
+ 2021-08-26 1f8d4562de cmd/compile: change typecheck.iscmp into ir.Op.IsCmp

Change-Id: I95c040a0e984a13a3b12c50458148007221ee300

1 files changed, 10 insertions, 0 deletions

diff --git a/src/cmd/compile/internal/ir/node.go b/src/cmd/compile/internal/ir/node.go
index f071cb78ce..8784f9ef99 100644
--- a/src/cmd/compile/internal/ir/node.go
+++ b/src/cmd/compile/internal/ir/node.go
@@ -334,6 +334,16 @@ const (
 	OEND
 )
 
+// IsCmp reports whether op is a comparison operation (==, !=, <, <=,
+// >, or >=).
+func (op Op) IsCmp() bool {
+	switch op {
+	case OEQ, ONE, OLT, OLE, OGT, OGE:
+		return true
+	}
+	return false
+}
+
 // Nodes is a pointer to a slice of *Node.
 // For fields that are not used in most nodes, this is used instead of
 // a slice to save space.