S390: [wasm] Int64Lowering of Int64Sub.

src/s390/macro-assembler-s390.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/base/bits.h"
@@ skipping 4058 matching lines @@
   alg(dst, opnd);
 #else
   AddLogical(dst, opnd);
 #endif
 }
 
 //----------------------------------------------------------------------------
 //  Subtract Instructions
 //----------------------------------------------------------------------------
 
+// Subtract Logical With Carry 32-bit (Register dst = Register src1 - Register
+// src2)
+void MacroAssembler::SubLogicalWithBorrow32(Register dst, Register src1,
+                                            Register src2) {
+  if (!dst.is(src2) && !dst.is(src1)) {
+    lr(dst, src1);
+    slbr(dst, src2);
+  } else if (!dst.is(src2)) {
+    // dst == src1
+    DCHECK(dst.is(src1));
+    slbr(dst, src2);
+  } else {
+    // dst == src2
+    DCHECK(dst.is(src2));
+    lr(r0, dst);
+    SubLogicalWithBorrow32(dst, src1, r0);
+  }
+}
+
+// Subtract Logical 32-bit (Register dst = Register src1 - Register src2)
+void MacroAssembler::SubLogical32(Register dst, Register src1, Register src2) {
+  if (!dst.is(src2) && !dst.is(src1)) {
+    lr(dst, src1);
+    slr(dst, src2);
+  } else if (!dst.is(src2)) {
+    // dst == src1
+    DCHECK(dst.is(src1));
+    slr(dst, src2);
+  } else {
+    // dst == src2
+    DCHECK(dst.is(src2));
+    lr(r0, dst);
+    SubLogical32(dst, src1, r0);
+  }
+}
+
 // Subtract 32-bit (Register dst = Register dst - Immediate opnd)
 void MacroAssembler::Sub32(Register dst, const Operand& imm) {
   Add32(dst, Operand(-(imm.imm_)));
 }
 
 // Subtract Pointer Size (Register dst = Register dst - Immediate opnd)
 void MacroAssembler::SubP(Register dst, const Operand& imm) {
   AddP(dst, Operand(-(imm.imm_)));
 }
 
@@ skipping 1377 matching lines @@
   }
   if (mag.shift > 0) ShiftRightArith(result, result, Operand(mag.shift));
   ExtractBit(r0, dividend, 31);
   AddP(result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390