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The __fp16 type is unconditionally exposed. Since -mfp16-format is not yet supported, there is not a user switch to change this behaviour. This build attribute should capture the default behaviour of the compiler, which is to expose the IEEE 754 version of __fp16. When -mfp16-format is emitted, that will be the way to control the value of this build attribute. Change-Id: I8a46641ff0fd2ef8ad0af5f482a6d1af2ac3f6b0 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224115 91177308-0d34-0410-b5e6-96231b3b80d8
229 lines
8.4 KiB
C++
229 lines
8.4 KiB
C++
//===-- ARMBuildAttributes.h - ARM Build Attributes -------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains enumerations and support routines for ARM build attributes
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// as defined in ARM ABI addenda document (ABI release 2.08).
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//
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// ELF for the ARM Architecture r2.09 - November 30, 2012
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//
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// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044e/IHI0044E_aaelf.pdf
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ARMBUILDATTRIBUTES_H
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#define LLVM_SUPPORT_ARMBUILDATTRIBUTES_H
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namespace llvm {
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class StringRef;
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namespace ARMBuildAttrs {
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enum SpecialAttr {
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// This is for the .cpu asm attr. It translates into one or more
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// AttrType (below) entries in the .ARM.attributes section in the ELF.
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SEL_CPU
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};
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enum AttrType {
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// Rest correspond to ELF/.ARM.attributes
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File = 1,
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CPU_raw_name = 4,
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CPU_name = 5,
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CPU_arch = 6,
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CPU_arch_profile = 7,
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ARM_ISA_use = 8,
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THUMB_ISA_use = 9,
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FP_arch = 10,
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WMMX_arch = 11,
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Advanced_SIMD_arch = 12,
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PCS_config = 13,
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ABI_PCS_R9_use = 14,
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ABI_PCS_RW_data = 15,
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ABI_PCS_RO_data = 16,
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ABI_PCS_GOT_use = 17,
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ABI_PCS_wchar_t = 18,
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ABI_FP_rounding = 19,
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ABI_FP_denormal = 20,
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ABI_FP_exceptions = 21,
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ABI_FP_user_exceptions = 22,
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ABI_FP_number_model = 23,
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ABI_align_needed = 24,
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ABI_align_preserved = 25,
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ABI_enum_size = 26,
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ABI_HardFP_use = 27,
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ABI_VFP_args = 28,
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ABI_WMMX_args = 29,
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ABI_optimization_goals = 30,
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ABI_FP_optimization_goals = 31,
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compatibility = 32,
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CPU_unaligned_access = 34,
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FP_HP_extension = 36,
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ABI_FP_16bit_format = 38,
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MPextension_use = 42, // recoded from 70 (ABI r2.08)
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DIV_use = 44,
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also_compatible_with = 65,
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conformance = 67,
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Virtualization_use = 68,
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/// Legacy Tags
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Section = 2, // deprecated (ABI r2.09)
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Symbol = 3, // deprecated (ABI r2.09)
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ABI_align8_needed = 24, // renamed to ABI_align_needed (ABI r2.09)
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ABI_align8_preserved = 25, // renamed to ABI_align_preserved (ABI r2.09)
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nodefaults = 64, // deprecated (ABI r2.09)
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T2EE_use = 66, // deprecated (ABI r2.09)
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MPextension_use_old = 70 // recoded to MPextension_use (ABI r2.08)
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};
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StringRef AttrTypeAsString(unsigned Attr, bool HasTagPrefix = true);
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StringRef AttrTypeAsString(AttrType Attr, bool HasTagPrefix = true);
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int AttrTypeFromString(StringRef Tag);
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// Magic numbers for .ARM.attributes
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enum AttrMagic {
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Format_Version = 0x41
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};
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// Legal Values for CPU_arch, (=6), uleb128
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enum CPUArch {
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Pre_v4 = 0,
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v4 = 1, // e.g. SA110
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v4T = 2, // e.g. ARM7TDMI
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v5T = 3, // e.g. ARM9TDMI
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v5TE = 4, // e.g. ARM946E_S
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v5TEJ = 5, // e.g. ARM926EJ_S
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v6 = 6, // e.g. ARM1136J_S
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v6KZ = 7, // e.g. ARM1176JZ_S
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v6T2 = 8, // e.g. ARM1156T2F_S
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v6K = 9, // e.g. ARM1136J_S
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v7 = 10, // e.g. Cortex A8, Cortex M3
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v6_M = 11, // e.g. Cortex M1
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v6S_M = 12, // v6_M with the System extensions
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v7E_M = 13, // v7_M with DSP extensions
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v8 = 14 // v8, AArch32
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};
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enum CPUArchProfile { // (=7), uleb128
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Not_Applicable = 0, // pre v7, or cross-profile code
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ApplicationProfile = (0x41), // 'A' (e.g. for Cortex A8)
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RealTimeProfile = (0x52), // 'R' (e.g. for Cortex R4)
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MicroControllerProfile = (0x4D), // 'M' (e.g. for Cortex M3)
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SystemProfile = (0x53) // 'S' Application or real-time profile
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};
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// The following have a lot of common use cases
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enum {
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Not_Allowed = 0,
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Allowed = 1,
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// Tag_ARM_ISA_use (=8), uleb128
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// Tag_THUMB_ISA_use, (=9), uleb128
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AllowThumb32 = 2, // 32-bit Thumb (implies 16-bit instructions)
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// Tag_FP_arch (=10), uleb128 (formerly Tag_VFP_arch = 10)
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AllowFPv2 = 2, // v2 FP ISA permitted (implies use of the v1 FP ISA)
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AllowFPv3A = 3, // v3 FP ISA permitted (implies use of the v2 FP ISA)
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AllowFPv3B = 4, // v3 FP ISA permitted, but only D0-D15, S0-S31
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AllowFPv4A = 5, // v4 FP ISA permitted (implies use of v3 FP ISA)
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AllowFPv4B = 6, // v4 FP ISA was permitted, but only D0-D15, S0-S31
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AllowFPARMv8A = 7, // Use of the ARM v8-A FP ISA was permitted
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AllowFPARMv8B = 8, // Use of the ARM v8-A FP ISA was permitted, but only
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// D0-D15, S0-S31
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// Tag_WMMX_arch, (=11), uleb128
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AllowWMMXv1 = 1, // The user permitted this entity to use WMMX v1
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AllowWMMXv2 = 2, // The user permitted this entity to use WMMX v2
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// Tag_Advanced_SIMD_arch, (=12), uleb128
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AllowNeon = 1, // SIMDv1 was permitted
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AllowNeon2 = 2, // SIMDv2 was permitted (Half-precision FP, MAC operations)
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AllowNeonARMv8 = 3, // ARM v8-A SIMD was permitted
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// Tag_ABI_PCS_R9_use, (=14), uleb128
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R9IsGPR = 0, // R9 used as v6 (just another callee-saved register)
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R9IsSB = 1, // R9 used as a global static base rgister
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R9IsTLSPointer = 2, // R9 used as a thread local storage pointer
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R9Reserved = 3, // R9 not used by code associated with attributed entity
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// Tag_ABI_PCS_RW_data, (=15), uleb128
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AddressRWPCRel = 1, // Address RW static data PC-relative
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AddressRWSBRel = 2, // Address RW static data SB-relative
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AddressRWNone = 3, // No RW static data permitted
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// Tag_ABI_PCS_RO_data, (=14), uleb128
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AddressROPCRel = 1, // Address RO static data PC-relative
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AddressRONone = 2, // No RO static data permitted
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// Tag_ABI_PCS_GOT_use, (=17), uleb128
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AddressDirect = 1, // Address imported data directly
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AddressGOT = 2, // Address imported data indirectly (via GOT)
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// Tag_ABI_PCS_wchar_t, (=18), uleb128
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WCharProhibited = 0, // wchar_t is not used
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WCharWidth2Bytes = 2, // sizeof(wchar_t) == 2
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WCharWidth4Bytes = 4, // sizeof(wchar_t) == 4
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// Tag_ABI_FP_denormal, (=20), uleb128
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PositiveZero = 0,
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IEEEDenormals = 1,
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PreserveFPSign = 2, // sign when flushed-to-zero is preserved
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// Tag_ABI_FP_number_model, (=23), uleb128
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AllowRTABI = 2, // numbers, infinities, and one quiet NaN (see [RTABI])
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AllowIEE754 = 3, // this code to use all the IEEE 754-defined FP encodings
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// Tag_ABI_enum_size, (=26), uleb128
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EnumProhibited = 0, // The user prohibited the use of enums when building
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// this entity.
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EnumSmallest = 1, // Enum is smallest container big enough to hold all
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// values.
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Enum32Bit = 2, // Enum is at least 32 bits.
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Enum32BitABI = 3, // Every enumeration visible across an ABI-complying
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// interface contains a value needing 32 bits to encode
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// it; other enums can be containerized.
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// Tag_ABI_HardFP_use, (=27), uleb128
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HardFPImplied = 0, // FP use should be implied by Tag_FP_arch
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HardFPSinglePrecision = 1, // Single-precision only
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// Tag_ABI_VFP_args, (=28), uleb128
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BaseAAPCS = 0,
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HardFPAAPCS = 1,
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// Tag_FP_HP_extension, (=36), uleb128
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AllowHPFP = 1, // Allow use of Half Precision FP
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// Tag_FP_16bit_format, (=38), uleb128
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FP16FormatIEEE = 1,
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// Tag_MPextension_use, (=42), uleb128
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AllowMP = 1, // Allow use of MP extensions
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// Tag_DIV_use, (=44), uleb128
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// Note: AllowDIVExt must be emitted if and only if the permission to use
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// hardware divide cannot be conveyed using AllowDIVIfExists or DisallowDIV
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AllowDIVIfExists = 0, // Allow hardware divide if available in arch, or no
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// info exists.
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DisallowDIV = 1, // Hardware divide explicitly disallowed.
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AllowDIVExt = 2, // Allow hardware divide as optional architecture
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// extension above the base arch specified by
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// Tag_CPU_arch and Tag_CPU_arch_profile.
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// Tag_Virtualization_use, (=68), uleb128
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AllowTZ = 1,
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AllowVirtualization = 2,
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AllowTZVirtualization = 3
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};
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} // namespace ARMBuildAttrs
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} // namespace llvm
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#endif
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