Introduce globalsym_addr.

This is an instruction used in legalization of GlobalVarData::Sym global
variables.

lib/cretonne/meta/base/instructions.py

@@ -389,6 +389,14 @@ global_addr = Instruction(
         """,
         ins=GV, outs=addr)
 
+# A specialized form of global_addr instructions that only handles
+# symbolic names.
+globalsym_addr = Instruction(
+        'globalsym_addr', r"""
+        Compute the address of global variable GV, which is a symbolic name.
+        """,
+        ins=GV, outs=addr)
+
 #
 # WebAssembly bounds-checked heap accesses.
 #

lib/cretonne/meta/isa/intel/encodings.py

@@ -271,6 +271,13 @@ I32.enc(base.func_addr.i32, *r.allones_fnaddr4(0xb8),
 I64.enc(base.func_addr.i64, *r.allones_fnaddr8.rex(0xb8, w=1),
         isap=allones_funcaddrs)
 
+#
+# Global addresses.
+#
+
+I32.enc(base.globalsym_addr.i32, *r.gvaddr4(0xb8))
+I64.enc(base.globalsym_addr.i64, *r.gvaddr8.rex(0xb8, w=1))
+
 #
 # Call/return
 #

lib/cretonne/meta/isa/intel/recipes.py

@@ -9,7 +9,7 @@ from base.formats import Unary, UnaryImm, Binary, BinaryImm, MultiAry
 from base.formats import Trap, Call, IndirectCall, Store, Load
 from base.formats import IntCompare, FloatCompare, IntCond, FloatCond
 from base.formats import Jump, Branch, BranchInt, BranchFloat
-from base.formats import Ternary, FuncAddr
+from base.formats import Ternary, FuncAddr, UnaryGlobalVar
 from base.formats import RegMove, RegSpill, RegFill
 from .registers import GPR, ABCD, FPR, GPR8, FPR8, FLAG, StackGPR32, StackFPR32
 from .defs import supported_floatccs
@@ -510,6 +510,24 @@ allones_fnaddr8 = TailRecipe(
         sink.put8(!0);
         ''')
 
+# XX+rd id with Abs4 globalsym relocation.
+gvaddr4 = TailRecipe(
+        'gvaddr4', UnaryGlobalVar, size=4, ins=(), outs=GPR,
+        emit='''
+        PUT_OP(bits | (out_reg0 & 7), rex1(out_reg0), sink);
+        sink.reloc_globalsym(RelocKind::Abs4.into(), global_var);
+        sink.put4(0);
+        ''')
+
+# XX+rd iq with Abs8 globalsym relocation.
+gvaddr8 = TailRecipe(
+        'gvaddr8', UnaryGlobalVar, size=8, ins=(), outs=GPR,
+        emit='''
+        PUT_OP(bits | (out_reg0 & 7), rex1(out_reg0), sink);
+        sink.reloc_globalsym(RelocKind::Abs8.into(), global_var);
+        sink.put8(0);
+        ''')
+
 #
 # Store recipes.
 #