zra@google.com
5d3f4708ec
1. Deopts on division when neither vfp nor idiv are present. In a subsequent CL, I can add a leaf runtime call for this. 2. Uses a different PC read offset in STR and STM instructions. On ARMv5 and earlier, the PC read offset is 8 except in STR and STM instructions, where it is implementation defined. On lego mindstorm it is 12. This requires changing kEntryPointToPcMarkerOffset to be a function. 3. Uses a dummy struct to compute the size of a compressed pc descriptor to avoid alignment issues. sizeof(PcDescriptorRec) is 16 on ia32 and arm. Subtracting sizeof(int16_t) gives 14, which creates alignment problems on ARM, i.e. poor performance on ARMv6 and later, and wrong results on ARMv5 and earlier. R=regis@google.com Review URL: https://codereview.chromium.org//467103005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@39250 260f80e4-7a28-3924-810f-c04153c831b5
133 lines
3.5 KiB
C++
133 lines
3.5 KiB
C++
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_CPU_ARM_H_
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#define VM_CPU_ARM_H_
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#include "vm/allocation.h"
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#include "vm/simulator.h"
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namespace dart {
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// TargetCPUFeatures gives CPU features for the architecture that we are
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// generating code for. HostCPUFeatures gives the CPU features for the
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// architecture that we are actually running on. When the architectures
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// are the same, TargetCPUFeatures will query HostCPUFeatures. When they are
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// different (i.e. we are running in a simulator), HostCPUFeatures will
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// additionally mock the options needed for the target architecture so that
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// they may be altered for testing.
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enum ARMVersion {
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ARMv5TE,
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ARMv6,
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ARMv7,
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ARMvUnknown,
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};
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class HostCPUFeatures: public AllStatic {
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public:
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static void InitOnce();
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static void Cleanup();
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static const char* hardware() {
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DEBUG_ASSERT(initialized_);
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return hardware_;
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}
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static bool integer_division_supported() {
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DEBUG_ASSERT(initialized_);
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return integer_division_supported_;
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}
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static bool vfp_supported() {
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DEBUG_ASSERT(initialized_);
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return vfp_supported_;
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}
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static bool neon_supported() {
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DEBUG_ASSERT(initialized_);
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return neon_supported_;
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}
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static bool hardfp_supported() {
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DEBUG_ASSERT(initialized_);
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return hardfp_supported_;
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}
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static ARMVersion arm_version() {
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DEBUG_ASSERT(initialized_);
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return arm_version_;
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}
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static intptr_t store_pc_read_offset() {
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DEBUG_ASSERT(initialized_);
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return store_pc_read_offset_;
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}
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#if !defined(HOST_ARCH_ARM)
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static void set_integer_division_supported(bool supported) {
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DEBUG_ASSERT(initialized_);
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integer_division_supported_ = supported;
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}
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static void set_vfp_supported(bool supported) {
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DEBUG_ASSERT(initialized_);
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vfp_supported_ = supported;
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}
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static void set_neon_supported(bool supported) {
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DEBUG_ASSERT(initialized_);
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neon_supported_ = supported;
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}
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static void set_arm_version(ARMVersion version) {
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DEBUG_ASSERT(initialized_);
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arm_version_ = version;
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}
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#endif // !defined(HOST_ARCH_ARM)
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private:
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static const char* hardware_;
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static bool integer_division_supported_;
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static bool vfp_supported_;
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static bool neon_supported_;
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static bool hardfp_supported_;
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static ARMVersion arm_version_;
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static intptr_t store_pc_read_offset_;
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#if defined(DEBUG)
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static bool initialized_;
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#endif
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};
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class TargetCPUFeatures : public AllStatic {
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public:
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static void InitOnce() {
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HostCPUFeatures::InitOnce();
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}
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static void Cleanup() {
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HostCPUFeatures::Cleanup();
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}
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static bool double_truncate_round_supported() {
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return false;
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}
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static bool integer_division_supported() {
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return HostCPUFeatures::integer_division_supported();
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}
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static bool vfp_supported() {
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return HostCPUFeatures::vfp_supported();
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}
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static bool can_divide() {
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return integer_division_supported() || vfp_supported();
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}
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static bool neon_supported() {
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return HostCPUFeatures::neon_supported();
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}
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static bool hardfp_supported() {
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return HostCPUFeatures::hardfp_supported();
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}
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static const char* hardware() {
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return HostCPUFeatures::hardware();
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}
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static ARMVersion arm_version() {
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return HostCPUFeatures::arm_version();
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}
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static intptr_t store_pc_read_offset() {
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return HostCPUFeatures::store_pc_read_offset();
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}
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};
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} // namespace dart
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#endif // VM_CPU_ARM_H_
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