1 //===-- MCTargetDesc/AMDGPUMCAsmInfo.cpp - Assembly Info ------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 /// \file
8 //===----------------------------------------------------------------------===//
9 
10 #include "AMDGPUMCAsmInfo.h"
11 #include "llvm/ADT/Triple.h"
12 #include "llvm/MC/MCSubtargetInfo.h"
13 #include "MCTargetDesc/AMDGPUMCTargetDesc.h"
14 
15 using namespace llvm;
16 
17 AMDGPUMCAsmInfo::AMDGPUMCAsmInfo(const Triple &TT,
18                                  const MCTargetOptions &Options)
19     : MCAsmInfoELF() {
20   CodePointerSize = (TT.getArch() == Triple::amdgcn) ? 8 : 4;
21   StackGrowsUp = true;
22   HasSingleParameterDotFile = false;
23   //===------------------------------------------------------------------===//
24   MinInstAlignment = 4;
25 
26   // This is the maximum instruction encoded size for gfx10. With a known
27   // subtarget, it can be reduced to 8 bytes.
28   MaxInstLength = (TT.getArch() == Triple::amdgcn) ? 20 : 16;
29   SeparatorString = "\n";
30   CommentString = ";";
31   PrivateLabelPrefix = "";
32   InlineAsmStart = ";#ASMSTART";
33   InlineAsmEnd = ";#ASMEND";
34 
35   //===--- Data Emission Directives -------------------------------------===//
36   SunStyleELFSectionSwitchSyntax = true;
37   UsesELFSectionDirectiveForBSS = true;
38 
39   //===--- Global Variable Emission Directives --------------------------===//
40   HasAggressiveSymbolFolding = true;
41   COMMDirectiveAlignmentIsInBytes = false;
42   HasNoDeadStrip = true;
43   //===--- Dwarf Emission Directives -----------------------------------===//
44   SupportsDebugInformation = true;
45   UsesCFIForDebug = true;
46   DwarfRegNumForCFI = true;
47 
48   UseIntegratedAssembler = false;
49 }
50 
51 bool AMDGPUMCAsmInfo::shouldOmitSectionDirective(StringRef SectionName) const {
52   return SectionName == ".hsatext" || SectionName == ".hsadata_global_agent" ||
53          SectionName == ".hsadata_global_program" ||
54          SectionName == ".hsarodata_readonly_agent" ||
55          MCAsmInfo::shouldOmitSectionDirective(SectionName);
56 }
57 
58 unsigned AMDGPUMCAsmInfo::getMaxInstLength(const MCSubtargetInfo *STI) const {
59   if (!STI || STI->getTargetTriple().getArch() == Triple::r600)
60     return MaxInstLength;
61 
62   // Maximum for NSA encoded images
63   if (STI->getFeatureBits()[AMDGPU::FeatureNSAEncoding])
64     return 20;
65 
66   // 64-bit instruction with 32-bit literal.
67   if (STI->getFeatureBits()[AMDGPU::FeatureVOP3Literal])
68     return 12;
69 
70   return 8;
71 }
72