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 "MCTargetDesc/AMDGPUMCTargetDesc.h"
12 #include "llvm/MC/MCSubtargetInfo.h"
13 #include "llvm/TargetParser/Triple.h"
14 
15 using namespace llvm;
16 
17 AMDGPUMCAsmInfo::AMDGPUMCAsmInfo(const Triple &TT,
18                                  const MCTargetOptions &Options) {
19   CodePointerSize = (TT.getArch() == Triple::amdgcn) ? 8 : 4;
20   StackGrowsUp = true;
21   HasSingleParameterDotFile = false;
22   //===------------------------------------------------------------------===//
23   MinInstAlignment = 4;
24 
25   // This is the maximum instruction encoded size for gfx10. With a known
26   // subtarget, it can be reduced to 8 bytes.
27   MaxInstLength = (TT.getArch() == Triple::amdgcn) ? 20 : 16;
28   SeparatorString = "\n";
29   CommentString = ";";
30   InlineAsmStart = ";#ASMSTART";
31   InlineAsmEnd = ";#ASMEND";
32 
33   //===--- Data Emission Directives -------------------------------------===//
34   SunStyleELFSectionSwitchSyntax = true;
35   UsesELFSectionDirectiveForBSS = true;
36 
37   //===--- Global Variable Emission Directives --------------------------===//
38   HasAggressiveSymbolFolding = true;
39   COMMDirectiveAlignmentIsInBytes = false;
40   HasNoDeadStrip = true;
41   //===--- Dwarf Emission Directives -----------------------------------===//
42   SupportsDebugInformation = true;
43   UsesCFIWithoutEH = true;
44   DwarfRegNumForCFI = true;
45 
46   UseIntegratedAssembler = false;
47 }
48 
49 bool AMDGPUMCAsmInfo::shouldOmitSectionDirective(StringRef SectionName) const {
50   return SectionName == ".hsatext" || SectionName == ".hsadata_global_agent" ||
51          SectionName == ".hsadata_global_program" ||
52          SectionName == ".hsarodata_readonly_agent" ||
53          MCAsmInfo::shouldOmitSectionDirective(SectionName);
54 }
55 
56 unsigned AMDGPUMCAsmInfo::getMaxInstLength(const MCSubtargetInfo *STI) const {
57   if (!STI || STI->getTargetTriple().getArch() == Triple::r600)
58     return MaxInstLength;
59 
60   // Maximum for NSA encoded images
61   if (STI->hasFeature(AMDGPU::FeatureNSAEncoding))
62     return 20;
63 
64   // 64-bit instruction with 32-bit literal.
65   if (STI->hasFeature(AMDGPU::FeatureVOP3Literal))
66     return 12;
67 
68   return 8;
69 }
70