cmd/compile: move branchelim supported arches to Config

Change-Id: I8d10399ba71e5fa97ead06a717fc972c806c0856
Reviewed-on: https://go-review.googlesource.com/c/go/+/715042
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

src/cmd/compile/internal/ssa/branchelim.go

@@ -21,10 +21,7 @@ import "cmd/internal/src"
 // rewrite Phis in the postdominator as CondSelects.
 func branchelim(f *Func) {
 	// FIXME: add support for lowering CondSelects on more architectures
-	switch f.Config.arch {
+	if !f.Config.haveCondSelect {
-	case "arm64", "ppc64le", "ppc64", "amd64", "wasm", "loong64":
-		// implemented
-	default:
 		return
 	}
 

src/cmd/compile/internal/ssa/config.go

@@ -50,6 +50,7 @@ type Config struct {
 	haveBswap64    bool      // architecture implements Bswap64
 	haveBswap32    bool      // architecture implements Bswap32
 	haveBswap16    bool      // architecture implements Bswap16
+	haveCondSelect bool      // architecture implements CondSelect
 
 	// mulRecipes[x] = function to build v * x from v.
 	mulRecipes map[int64]mulRecipe
@@ -191,6 +192,7 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize, softfloat boo
 		c.haveBswap64 = true
 		c.haveBswap32 = true
 		c.haveBswap16 = true
+		c.haveCondSelect = true
 	case "386":
 		c.PtrSize = 4
 		c.RegSize = 4
@@ -236,6 +238,7 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize, softfloat boo
 		c.haveBswap64 = true
 		c.haveBswap32 = true
 		c.haveBswap16 = true
+		c.haveCondSelect = true
 	case "ppc64":
 		c.BigEndian = true
 		fallthrough
@@ -263,6 +266,7 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize, softfloat boo
 		c.haveBswap64 = true
 		c.haveBswap32 = true
 		c.haveBswap16 = true
+		c.haveCondSelect = true
 	case "mips64":
 		c.BigEndian = true
 		fallthrough
@@ -296,6 +300,7 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize, softfloat boo
 		c.LinkReg = linkRegLOONG64
 		c.hasGReg = true
 		c.unalignedOK = true
+		c.haveCondSelect = true
 	case "s390x":
 		c.PtrSize = 8
 		c.RegSize = 8
@@ -357,6 +362,7 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize, softfloat boo
 		c.useAvg = false
 		c.useHmul = false
 		c.unalignedOK = true
+		c.haveCondSelect = true
 	default:
 		ctxt.Diag("arch %s not implemented", arch)
 	}