PPC: [wasm] Int64Lowering of I64Shl.

src/ppc/macro-assembler-ppc.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_PPC
 
 #include "src/base/bits.h"
@@ skipping 785 matching lines @@
   } else {
     SetRoundingMode(rounding_mode);
     fctidu(double_dst, double_input);
     ResetRoundingMode();
   }
 
   MovDoubleToInt64(dst, double_dst);
 }
 #endif
 
+#if !V8_TARGET_ARCH_PPC64
+void MacroAssembler::PairShiftLeft(Register dst_low, Register dst_high,
+                                   Register src_low, Register src_high,
+                                   Register scratch, Register shift) {
+  DCHECK(!AreAliased(dst_low, src_high, shift));
+  DCHECK(!AreAliased(dst_high, src_low, shift));
+  Label less_than_32;
+  Label done;
+  cmpi(shift, Operand(32));
+  blt(&less_than_32);
+  // If shift >= 32
+  andi(scratch, shift, Operand(0x1f));
+  slw(dst_high, src_low, scratch);
+  li(dst_low, Operand::Zero());
+  b(&done);
+  bind(&less_than_32);
+  // If shift < 32
+  subfic(scratch, shift, Operand(32));
+  slw(dst_high, src_high, shift);
+  srw(scratch, src_low, scratch);
+  orx(dst_high, dst_high, scratch);
+  slw(dst_low, src_low, shift);
+  bind(&done);
+}
+
+void MacroAssembler::PairShiftLeft(Register dst_low, Register dst_high,
+                                   Register src_low, Register src_high,
+                                   uint32_t shift) {
+  DCHECK(!AreAliased(dst_low, src_high));
+  DCHECK(!AreAliased(dst_high, src_low));
+  Label less_than_32;
+  Label done;
+  if (shift >= 32) {
+    shift &= 0x1f;
+    slwi(dst_high, src_low, Operand(shift));
+    li(dst_low, Operand::Zero());
+  } else if (shift == 0) {
+    Move(dst_low, src_low);
+    Move(dst_high, src_high);
+  } else {
+    slwi(dst_high, src_high, Operand(shift));
+    rlwimi(dst_high, src_low, shift, 32 - shift, 31);
+    slwi(dst_low, src_low, Operand(shift));
+  }
+}
+#endif
 
 void MacroAssembler::LoadConstantPoolPointerRegisterFromCodeTargetAddress(
     Register code_target_address) {
   lwz(kConstantPoolRegister,
       MemOperand(code_target_address,
                  Code::kConstantPoolOffset - Code::kHeaderSize));
   add(kConstantPoolRegister, kConstantPoolRegister, code_target_address);
 }
 
 
@@ skipping 3645 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC