386 shift bug; wasn't zero-extending 16- and 8-bit counts

+test

R=ken
OCL=35801
CL=35801

src/cmd/8g/cgen64.c

@@ -178,8 +178,10 @@ cgen64(Node *n, Node *res)
 			gins(ACMPL, &hi2, ncon(0));
 			p1 = gbranch(AJNE, T);
 			gins(AMOVL, &lo2, &cx);
-		} else
-			gins(AMOVL, r, &cx);
+		} else {
+			cx.type = types[TUINT32];
+			gmove(r, &cx);
+		}
 
 		// if shift count is >=64, zero value
 		gins(ACMPL, &cx, ncon(64));
@@ -265,8 +267,10 @@ cgen64(Node *n, Node *res)
 			gins(ACMPL, &hi2, ncon(0));
 			p1 = gbranch(AJNE, T);
 			gins(AMOVL, &lo2, &cx);
-		} else
-			gins(AMOVL, r, &cx);
+		} else {
+			cx.type = types[TUINT32];
+			gmove(r, &cx);
+		}
 
 		// if shift count is >=64, zero or sign-extend value
 		gins(ACMPL, &cx, ncon(64));

test/64bit.go

@@ -459,12 +459,27 @@ const prolog =
 	"}\n"
 	"\n"
 	"func testInt64Shift(a int64, b uint64, left, right int64) {\n"
-	"	if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, s, `=`, n, `should be`, want); }\n"
-	"	if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, s, `=`, n, `should be`, want); }\n"
+	"	if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint64`, s, `=`, n, `should be`, want); }\n"
+	"	if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint64`, s, `=`, n, `should be`, want); }\n"
+	"	if uint64(uint(b)) == b {\n"
+	"		b := uint(b);\n"
+	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint`, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint`, s, `=`, n, `should be`, want); }\n"
+	"	}\n"
 	"	if uint64(uint32(b)) == b {\n"
 	"		b := uint32(b);\n"
-	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, s, `=`, n, `should be`, want); }\n"
-	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint32`, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint32`, s, `=`, n, `should be`, want); }\n"
+	"	}\n"
+	"	if uint64(uint16(b)) == b {\n"
+	"		b := uint16(b);\n"
+	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint16`, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint16`, s, `=`, n, `should be`, want); }\n"
+	"	}\n"
+	"	if uint64(uint8(b)) == b {\n"
+	"		b := uint8(b);\n"
+	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`int64`, a, op, `uint8`, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`int64`, a, op, `uint8`, s, `=`, n, `should be`, want); }\n"
 	"	}\n"
 	"}\n"
 	"\n"
@@ -489,12 +504,27 @@ const prolog =
 	"}\n"
 	"\n"
 	"func testUint64Shift(a, b, left, right uint64) {\n"
-	"	if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, s, `=`, n, `should be`, want); }\n"
-	"	if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, s, `=`, n, `should be`, want); }\n"
+	"	if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint64`, s, `=`, n, `should be`, want); }\n"
+	"	if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint64`, s, `=`, n, `should be`, want); }\n"
+	"	if uint64(uint(b)) == b {\n"
+	"		b := uint(b);\n"
+	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint`, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint`, s, `=`, n, `should be`, want); }\n"
+	"	}\n"
 	"	if uint64(uint32(b)) == b {\n"
 	"		b := uint32(b);\n"
-	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, s, `=`, n, `should be`, want); }\n"
-	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint32`, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint32`, s, `=`, n, `should be`, want); }\n"
+	"	}\n"
+	"	if uint64(uint16(b)) == b {\n"
+	"		b := uint16(b);\n"
+	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint16`, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint16`, s, `=`, n, `should be`, want); }\n"
+	"	}\n"
+	"	if uint64(uint8(b)) == b {\n"
+	"		b := uint8(b);\n"
+	"		if n, op, s, want := a << b, `<<`, b, left; n != want { ok=false; println(`uint64`, a, op, `uint8`, s, `=`, n, `should be`, want); }\n"
+	"		if n, op, s, want := a >> b, `>>`, b, right; n != want { ok=false; println(`uint64`, a, op, `uint8`, s, `=`, n, `should be`, want); }\n"
 	"	}\n"
 	"}\n"
 	"\n"