diff options
Diffstat (limited to 'compiler/utils/arm/assembler_arm32.cc')
| -rw-r--r-- | compiler/utils/arm/assembler_arm32.cc | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/compiler/utils/arm/assembler_arm32.cc b/compiler/utils/arm/assembler_arm32.cc index 6f7119d578..c95dfa8066 100644 --- a/compiler/utils/arm/assembler_arm32.cc +++ b/compiler/utils/arm/assembler_arm32.cc @@ -1486,6 +1486,34 @@ void Arm32Assembler::LoadImmediate(Register rd, int32_t value, Condition cond) { } } +void Arm32Assembler::LoadDImmediate(DRegister dd, double value, Condition cond) { + if (!vmovd(dd, value, cond)) { + uint64_t int_value = bit_cast<uint64_t, double>(value); + if (int_value == bit_cast<uint64_t, double>(0.0)) { + // 0.0 is quite common, so we special case it by loading + // 2.0 in `dd` and then subtracting it. + bool success = vmovd(dd, 2.0, cond); + CHECK(success); + vsubd(dd, dd, dd, cond); + } else { + if (dd < 16) { + // Note: Depending on the particular CPU, this may cause register + // forwarding hazard, negatively impacting the performance. + SRegister low = static_cast<SRegister>(dd << 1); + SRegister high = static_cast<SRegister>(low + 1); + LoadSImmediate(low, bit_cast<float, uint32_t>(Low32Bits(int_value)), cond); + if (High32Bits(int_value) == Low32Bits(int_value)) { + vmovs(high, low); + } else { + LoadSImmediate(high, bit_cast<float, uint32_t>(High32Bits(int_value)), cond); + } + } else { + LOG(FATAL) << "Unimplemented loading of double into a D register " + << "that cannot be split into two S registers"; + } + } + } +} // Implementation note: this method must emit at most one instruction when // Address::CanHoldLoadOffsetArm. |