Make arm assembler explicitly take both registers for load/store-pair.

runtime/vm/intrinsifier_arm.cc

Index: runtime/vm/intrinsifier_arm.cc
diff --git a/runtime/vm/intrinsifier_arm.cc b/runtime/vm/intrinsifier_arm.cc
index dd6d509c34940a0085a1c23846dc065b52974d0d..f4cbb6a47d33dc77a3c2d5cddd9e5cce032c6fc6 100644
--- a/runtime/vm/intrinsifier_arm.cc
+++ b/runtime/vm/intrinsifier_arm.cc
@@ -225,7 +225,7 @@ void Intrinsifier::GrowableArray_add(Assembler* assembler) {
   __ Bind(&init_loop);                                                         \
   __ AddImmediate(R3, 2 * kWordSize);                                          \
   __ cmp(R3, Operand(R1));                                                     \
-  __ strd(R6, R3, -2 * kWordSize, LS);                                         \
+  __ strd(R6, R7, R3, -2 * kWordSize, LS);                                     \
   __ b(&init_loop, CC);                                                        \
   __ str(R6, Address(R3, -2 * kWordSize), HI);                                 \
                                                                                \
@@ -769,9 +769,9 @@ void Intrinsifier::Bigint_lsh(Assembler* assembler) {
   //                  Uint32List r_digits)
 
   // R2 = x_used, R3 = x_digits, x_used > 0, x_used is Smi.
-  __ ldrd(R2, SP, 2 * kWordSize);
+  __ ldrd(R2, R3, SP, 2 * kWordSize);
   // R4 = r_digits, R5 = n, n is Smi, n % _DIGIT_BITS != 0.
-  __ ldrd(R4, SP, 0 * kWordSize);
+  __ ldrd(R4, R5, SP, 0 * kWordSize);
   __ SmiUntag(R5);
   // R0 = n ~/ _DIGIT_BITS
   __ Asr(R0, R5, Operand(5));
@@ -809,9 +809,9 @@ void Intrinsifier::Bigint_rsh(Assembler* assembler) {
   //                  Uint32List r_digits)
 
   // R2 = x_used, R3 = x_digits, x_used > 0, x_used is Smi.
-  __ ldrd(R2, SP, 2 * kWordSize);
+  __ ldrd(R2, R3, SP, 2 * kWordSize);
   // R4 = r_digits, R5 = n, n is Smi, n % _DIGIT_BITS != 0.
-  __ ldrd(R4, SP, 0 * kWordSize);
+  __ ldrd(R4, R5, SP, 0 * kWordSize);
   __ SmiUntag(R5);
   // R0 = n ~/ _DIGIT_BITS
   __ Asr(R0, R5, Operand(5));
@@ -854,12 +854,12 @@ void Intrinsifier::Bigint_absAdd(Assembler* assembler) {
   //                     Uint32List r_digits)
 
   // R2 = used, R3 = digits
-  __ ldrd(R2, SP, 3 * kWordSize);
+  __ ldrd(R2, R3, SP, 3 * kWordSize);
   // R3 = &digits[0]
   __ add(R3, R3, Operand(TypedData::data_offset() - kHeapObjectTag));
 
   // R4 = a_used, R5 = a_digits
-  __ ldrd(R4, SP, 1 * kWordSize);
+  __ ldrd(R4, R5, SP, 1 * kWordSize);
   // R5 = &a_digits[0]
   __ add(R5, R5, Operand(TypedData::data_offset() - kHeapObjectTag));
 
@@ -914,12 +914,12 @@ void Intrinsifier::Bigint_absSub(Assembler* assembler) {
   //                     Uint32List r_digits)
 
   // R2 = used, R3 = digits
-  __ ldrd(R2, SP, 3 * kWordSize);
+  __ ldrd(R2, R3, SP, 3 * kWordSize);
   // R3 = &digits[0]
   __ add(R3, R3, Operand(TypedData::data_offset() - kHeapObjectTag));
 
   // R4 = a_used, R5 = a_digits
-  __ ldrd(R4, SP, 1 * kWordSize);
+  __ ldrd(R4, R5, SP, 1 * kWordSize);
   // R5 = &a_digits[0]
   __ add(R5, R5, Operand(TypedData::data_offset() - kHeapObjectTag));
 
@@ -994,7 +994,7 @@ void Intrinsifier::Bigint_mulAdd(Assembler* assembler) {
 
   Label done;
   // R3 = x, no_op if x == 0
-  __ ldrd(R0, SP, 5 * kWordSize);  // R0 = xi as Smi, R1 = x_digits.
+  __ ldrd(R0, R1, SP, 5 * kWordSize);  // R0 = xi as Smi, R1 = x_digits.
   __ add(R1, R1, Operand(R0, LSL, 1));
   __ ldr(R3, FieldAddress(R1, TypedData::data_offset()));
   __ tst(R3, Operand(R3));
@@ -1006,12 +1006,12 @@ void Intrinsifier::Bigint_mulAdd(Assembler* assembler) {
   __ b(&done, EQ);
 
   // R4 = mip = &m_digits[i >> 1]
-  __ ldrd(R0, SP, 3 * kWordSize);  // R0 = i as Smi, R1 = m_digits.
+  __ ldrd(R0, R1, SP, 3 * kWordSize);  // R0 = i as Smi, R1 = m_digits.
   __ add(R1, R1, Operand(R0, LSL, 1));
   __ add(R4, R1, Operand(TypedData::data_offset() - kHeapObjectTag));
 
   // R5 = ajp = &a_digits[j >> 1]
-  __ ldrd(R0, SP, 1 * kWordSize);  // R0 = j as Smi, R1 = a_digits.
+  __ ldrd(R0, R1, SP, 1 * kWordSize);  // R0 = j as Smi, R1 = a_digits.
   __ add(R1, R1, Operand(R0, LSL, 1));
   __ add(R5, R1, Operand(TypedData::data_offset() - kHeapObjectTag));
 
@@ -1094,7 +1094,7 @@ void Intrinsifier::Bigint_sqrAdd(Assembler* assembler) {
   // }
 
   // R4 = xip = &x_digits[i >> 1]
-  __ ldrd(R2, SP, 2 * kWordSize);  // R2 = i as Smi, R3 = x_digits
+  __ ldrd(R2, R3, SP, 2 * kWordSize);  // R2 = i as Smi, R3 = x_digits
   __ add(R3, R3, Operand(R2, LSL, 1));
   __ add(R4, R3, Operand(TypedData::data_offset() - kHeapObjectTag));
 
@@ -1172,7 +1172,7 @@ void Intrinsifier::Bigint_sqrAdd(Assembler* assembler) {
 
   // *ajp = low32(t) = R6
   // *(ajp + 1) = high32(t) = R7
-  __ strd(R6, R5, 0);
+  __ strd(R6, R7, R5, 0);
 
   __ Bind(&x_zero);
   __ mov(R0, Operand(Smi::RawValue(1)));  // One digit processed.
@@ -1203,7 +1203,7 @@ void Intrinsifier::Montgomery_mulMod(Assembler* assembler) {
                           TypedData::data_offset() + 2*Bigint::kBytesPerDigit));
 
   // R2 = digits[i >> 1]
-  __ ldrd(R0, SP, 0 * kWordSize);  // R0 = i as Smi, R1 = digits
+  __ ldrd(R0, R1, SP, 0 * kWordSize);  // R0 = i as Smi, R1 = digits
   __ add(R1, R1, Operand(R0, LSL, 1));
   __ ldr(R2, FieldAddress(R1, TypedData::data_offset()));