1 //===-- AMDGPUBaseInfo.cpp - AMDGPU Base encoding information--------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 #include "AMDGPUBaseInfo.h"
10 #include "llvm/MC/SubtargetFeature.h"
11 
12 #define GET_SUBTARGETINFO_ENUM
13 #include "AMDGPUGenSubtargetInfo.inc"
14 #undef GET_SUBTARGETINFO_ENUM
15 
16 namespace llvm {
17 namespace AMDGPU {
18 
19 IsaVersion getIsaVersion(const FeatureBitset &Features) {
20 
21   if (Features.test(FeatureISAVersion7_0_0))
22     return {7, 0, 0};
23 
24   if (Features.test(FeatureISAVersion7_0_1))
25     return {7, 0, 1};
26 
27   if (Features.test(FeatureISAVersion8_0_0))
28     return {8, 0, 0};
29 
30   if (Features.test(FeatureISAVersion8_0_1))
31     return {8, 0, 1};
32 
33   return {0, 0, 0};
34 }
35 
36 void initDefaultAMDKernelCodeT(amd_kernel_code_t &Header,
37                                const FeatureBitset &Features) {
38 
39   IsaVersion ISA = getIsaVersion(Features);
40 
41   memset(&Header, 0, sizeof(Header));
42 
43   Header.amd_kernel_code_version_major = 1;
44   Header.amd_kernel_code_version_minor = 0;
45   Header.amd_machine_kind = 1; // AMD_MACHINE_KIND_AMDGPU
46   Header.amd_machine_version_major = ISA.Major;
47   Header.amd_machine_version_minor = ISA.Minor;
48   Header.amd_machine_version_stepping = ISA.Stepping;
49   Header.kernel_code_entry_byte_offset = sizeof(Header);
50   // wavefront_size is specified as a power of 2: 2^6 = 64 threads.
51   Header.wavefront_size = 6;
52   // These alignment values are specified in powers of two, so alignment =
53   // 2^n.  The minimum alignment is 2^4 = 16.
54   Header.kernarg_segment_alignment = 4;
55   Header.group_segment_alignment = 4;
56   Header.private_segment_alignment = 4;
57 }
58 
59 } // End namespace AMDGPU
60 } // End namespace llvm
61