[wasm] Int64Lowering of I64ShrU and I64ShrS on ia32.

src/ia32/macro-assembler-ia32.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 688 matching lines @@
   mov(tmp, src);
   shr(src, 1);
   // Recover the least significant bit to avoid rounding errors.
   and_(tmp, Immediate(1));
   or_(src, tmp);
   cvtsi2ss(dst, src);
   addss(dst, dst);
   bind(&jmp_return);
 }
 
-void MacroAssembler::PairShl(Register dst, Register src, uint8_t shift) {
+void MacroAssembler::ShlPair(Register high, Register low, uint8_t shift) {
   if (shift >= 32) {
-    mov(dst, src);
-    shl(dst, shift - 32);
-    xor_(src, src);
+    mov(high, low);
+    shl(high, shift - 32);
+    xor_(low, low);
   } else {
-    shld(dst, src, shift);
-    shl(src, shift);
+    shld(high, low, shift);
+    shl(low, shift);
   }
 }
 
-void MacroAssembler::PairShl_cl(Register dst, Register src) {
-  shld_cl(dst, src);
-  shl_cl(src);
+void MacroAssembler::ShlPair_cl(Register high, Register low) {
+  shld_cl(high, low);
+  shl_cl(low);
   Label done;
   test(ecx, Immediate(0x20));
   j(equal, &done, Label::kNear);
-  mov(dst, src);
-  xor_(src, src);
+  mov(high, low);
+  xor_(low, low);
   bind(&done);
 }
 
+void MacroAssembler::ShrPair(Register high, Register low, uint8_t shift) {
+  if (shift >= 32) {
+    mov(low, high);
+    shr(low, shift - 32);
+    xor_(high, high);
+  } else {
+    shrd(high, low, shift);
+    shr(high, shift);
+  }
+}
+
+void MacroAssembler::ShrPair_cl(Register high, Register low) {
+  shrd_cl(low, high);
+  shr_cl(high);
+  Label done;
+  test(ecx, Immediate(0x20));
+  j(equal, &done, Label::kNear);
+  mov(low, high);
+  xor_(high, high);
+  bind(&done);
+}
+
+void MacroAssembler::SarPair(Register high, Register low, uint8_t shift) {
+  if (shift >= 32) {
+    mov(low, high);
+    sar(low, shift - 32);
+    sar(high, 31);
+  } else {
+    shrd(high, low, shift);
+    sar(high, shift);
+  }
+}
+
+void MacroAssembler::SarPair_cl(Register high, Register low) {
+  shrd_cl(low, high);
+  sar_cl(high);
+  Label done;
+  test(ecx, Immediate(0x20));
+  j(equal, &done, Label::kNear);
+  mov(low, high);
+  sar(high, 31);
+  bind(&done);
+}
+
 bool MacroAssembler::IsUnsafeImmediate(const Immediate& x) {
   static const int kMaxImmediateBits = 17;
   if (!RelocInfo::IsNone(x.rmode_)) return false;
   return !is_intn(x.x_, kMaxImmediateBits);
 }
 
 
 void MacroAssembler::SafeMove(Register dst, const Immediate& x) {
   if (IsUnsafeImmediate(x) && jit_cookie() != 0) {
     Move(dst, Immediate(x.x_ ^ jit_cookie()));
@@ skipping 2600 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32