[DirectX backend] PartSize not include PartHeader

[python3kgae]

Summary

PartSize for a part in dx container is only the size of the content of the part, not include size of the PartHeader.

[beanz]

LGTM

llvm/lib/MC/MCDXContainerWriter.cpp

for (const MCSection &Sec : Asm) {
     // Skip empty sections.
     if (SectionSize == 0)
       continue;
 
     unsigned Start = W.OS.tell();
     // Write section header.
     W.write<char>(ArrayRef<char>(Sec.getName().data(), 4));
 
-    uint64_t PartSize = SectionSize + sizeof(dxbc::PartHeader);
+    uint64_t PartSize = SectionSize;
 
     if (Sec.getName() == "DXIL")
       PartSize += sizeof(dxbc::ProgramHeader);
     // DXContainer parts should be 4-byte aligned.
     PartSize = alignTo(PartSize, Align(4));
     W.write<uint32_t>(static_cast<uint32_t>(PartSize));
     if (Sec.getName() == "DXIL") {
       dxbc::ProgramHeader Header;

llvm/test/CodeGen/DirectX/ContainerData/DebugShaderHash.ll

 
 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "Some Compiler", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
 !1 = !DIFile(filename: "hlsl.hlsl", directory: "/some-path")
 !2 = !{}
 !3 = !{i32 7, !"Dwarf Version", i32 2}
 !4 = !{i32 2, !"Debug Info Version", i32 3}
 
 ; DXC: - Name:            HASH
-; DXC:   Size:            28
+; DXC:   Size:            20
 ; DXC:   Hash:
 ; DXC:     IncludesSource:  true
 ; DXC:     Digest:          [ 

llvm/test/CodeGen/DirectX/ContainerData/ShaderHash.ll

 ; RUN: llc %s --filetype=asm -o - | FileCheck %s
 ; RUN: llc %s --filetype=obj -o - | obj2yaml | FileCheck %s --check-prefix=DXC
 target triple = "dxil-unknown-shadermodel6.5-library"
 
 ; CHECK: @dx.hash = private constant [20 x i8] c"\00\00\00\00{{.*}}", section "HASH", align 4
 
 define i32 @add(i32 %a, i32 %b) {
   %sum = add i32 %a, %b
   ret i32 %sum
 }
 
 ; DXC: - Name:            HASH
-; DXC:   Size:            28
+; DXC:   Size:            20
 ; DXC:   Hash:
 ; DXC:     IncludesSource:  false
 ; DXC:     Digest:          [ 

llvm/test/CodeGen/DirectX/ShaderFlags/double-extensions.ll

 ; CHECK-NEXT: {{^;$}}
 define double @div(double %a, double %b) {
   %res = fdiv double %a, %b
   ret double %res
 }
 
 
 ; DXC: - Name:            SFI0
-; DXC-NEXT:     Size:            16
+; DXC-NEXT:     Size:            8
 ; DXC-NEXT:     Flags:
 ; DXC-NEXT:       Doubles:         true
 ; DXC-NOT:   {{[A-Za-z]+: +true}}
 ; DXC:            DX11_1_DoubleExtensions:         true
 ; DXC-NOT:   {{[A-Za-z]+: +true}}
 ; DXC:       NextUnusedBit:   false
 ; DXC: ...

llvm/test/CodeGen/DirectX/ShaderFlags/doubles.ll

 ; RUN: opt -S --passes="print-dx-shader-flags" 2>&1 %s | FileCheck %s
 ; RUN: llc %s --filetype=obj -o - | obj2yaml | FileCheck %s --check-prefix=DXC
 
 target triple = "dxil-pc-shadermodel6.7-library"
 
 ; CHECK: ; Shader Flags Value: 0x00000001
 ; CHECK: ; Note: shader requires additional functionality:
 ; CHECK-NEXT: ;       Double-precision floating point
 ; CHECK-NEXT: {{^;$}}
 define double @add(double %a, double %b) {
   %sum = fadd double %a, %b
   ret double %sum
 }
 
 ; DXC: - Name:            SFI0
-; DXC-NEXT:     Size:            16
+; DXC-NEXT:     Size:            8
 ; DXC-NEXT:     Flags:
 ; DXC-NEXT:       Doubles:         true
 ; DXC-NOT:   {{[A-Za-z]+: +true}}
 ; DXC:       NextUnusedBit:   false
 ; DXC: ...

llvm/test/CodeGen/DirectX/embed-dxil.ll

 ; derives the program header and dxil size fields from the part's size.
 
 ; DXC:   - Name:            DXIL
 ; DXC-NEXT:     Size:            [[#SIZE:]]
 ; DXC-NEXT:     Program:
 ; DXC-NEXT:       MajorVersion:    6
 ; DXC-NEXT:       MinorVersion:    5
 ; DXC-NEXT:       ShaderKind:      6
-; DXC-NEXT:       Size:            [[#div(SIZE,4) - 2]]
+; DXC-NEXT:       Size:            [[#div(SIZE,4)]]
 ; DXC-NEXT:       DXILMajorVersion: [[#]]
 ; DXC-NEXT:       DXILMinorVersion: [[#]]
-; DXC-NEXT:       DXILSize:        [[#SIZE - 32]]
+; DXC-NEXT:       DXILSize:        [[#SIZE - 24]]
 ; DXC-NEXT:       DXIL:            [ 0x42, 0x43, 0xC0, 0xDE,
 ; DXC:      - Name:            SFI0
-; DXC-NEXT:   Size:            16
+; DXC-NEXT:   Size:            8
 ; DXC-NOT:    Flags: