s390: optimize for compares

src/s390/assembler-s390.cc

Index: src/s390/assembler-s390.cc
diff --git a/src/s390/assembler-s390.cc b/src/s390/assembler-s390.cc
index 688ceabf657d4b616738a235019f12507743651a..cecca3a47a5ff62ef366811dd0119653888bdfe3 100644
--- a/src/s390/assembler-s390.cc
+++ b/src/s390/assembler-s390.cc
@@ -1245,7 +1245,6 @@ void Assembler::rrfe_form(Opcode op, Condition m3, Condition m4, Register r1,
 // end of S390 Instruction generation
 
 // start of S390 instruction
-RXE_FORM_EMIT(ceb, CEB)
 SS1_FORM_EMIT(ed, ED)
 SS1_FORM_EMIT(mvn, MVN)
 SS1_FORM_EMIT(nc, NC)
@@ -1848,6 +1847,16 @@ void Assembler::sdb(DoubleRegister r1, const MemOperand& opnd) {
            opnd.offset());
 }
 
+void Assembler::ceb(DoubleRegister r1, const MemOperand& opnd) {
+  rxe_form(CEB, Register::from_code(r1.code()), opnd.rx(), opnd.rb(),
+           opnd.offset());
+}
+
+void Assembler::cdb(DoubleRegister r1, const MemOperand& opnd) {
+  rxe_form(CDB, Register::from_code(r1.code()), opnd.rx(), opnd.rb(),
+           opnd.offset());
+}
+
 // Square Root (LB)
 void Assembler::sqdb(DoubleRegister r1, const MemOperand& opnd) {
   rxe_form(SQDB, Register::from_code(r1.code()), opnd.rx(), opnd.rb(),