PPC: Allow share inputs in ShiftLeftPair and ShiftRightPair

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 792 matching lines @@
   }
 
   MovDoubleToInt64(dst, double_dst);
 }
 #endif
 
 #if !V8_TARGET_ARCH_PPC64
 void MacroAssembler::ShiftLeftPair(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));
+  DCHECK(!AreAliased(dst_low, src_high));
+  DCHECK(!AreAliased(dst_high, src_low));
+  DCHECK(!AreAliased(dst_low, dst_high, 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);
@@ skipping 24 matching lines @@
   } else {
     slwi(dst_high, src_high, Operand(shift));
     rlwimi(dst_high, src_low, shift, 32 - shift, 31);
     slwi(dst_low, src_low, Operand(shift));
   }
 }
 
 void MacroAssembler::ShiftRightPair(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));
+  DCHECK(!AreAliased(dst_low, src_high));
+  DCHECK(!AreAliased(dst_high, src_low));
+  DCHECK(!AreAliased(dst_low, dst_high, shift));
   Label less_than_32;
   Label done;
   cmpi(shift, Operand(32));
   blt(&less_than_32);
   // If shift >= 32
   andi(scratch, shift, Operand(0x1f));
   srw(dst_low, src_high, scratch);
   li(dst_high, Operand::Zero());
   b(&done);
   bind(&less_than_32);
@@ skipping 3385 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