[DirectX] Revise descriptions of DXIL module flags (#133543)

This PR revises the descriptions of DXIL module flags.

Descriptions such as `D3D11_1_SB_GLOBAL_FLAG_SKIP_OPTIMIZATION` are
referring to Global Flags in DXBC.
DXBC is not a supported backend target, so references to DXBC should not
be present.

There is also confusion with regards to the description of the
`LowPrecisionPresent` DXIL module flag, which currently reads
`D3D11_1_SB_GLOBAL_FLAG_ENABLE_MINIMUM_PRECISION` and implies the use of
minimum-precision to handle 16-bit types.
However this is not true, because both the flags `LowPrecisionPresent`
and `UseNativeLowPrecision` can simultaneously be set in the same DXIL
module, and minimum precision mode is mutually exclusive with native low
precision.
This PR revises the description of the `LowPrecisionPresent` flag to
accurately describe what it represents.

Author: Icohedron

llvm/include/llvm/BinaryFormat/DXContainerConstants.def

@@ -17,7 +17,7 @@ CONTAINER_PART(PSG1)
 // SHADER_FEATURE_FLAG(bit offset for the shader info flag, bit offset for DXIL module flag, name, description.
 
 SHADER_FEATURE_FLAG(0,   2, Doubles, "Double-precision floating point")
-SHADER_FEATURE_FLAG(1,  17, ComputeShadersPlusRawAndStructuredBuffers, "Raw and Structured buffers")
+SHADER_FEATURE_FLAG(1,  17, ComputeShadersPlusRawAndStructuredBuffers, "CS4 raw and structured buffers")
 SHADER_FEATURE_FLAG(2,  16, UAVsAtEveryStage, "UAVs at every shader stage")
 SHADER_FEATURE_FLAG(3,  15, Max64UAVs, "64 UAV slots")
 SHADER_FEATURE_FLAG(4,  -1, MinimumPrecision, "Minimum-precision data types")
@@ -43,12 +43,14 @@ SHADER_FEATURE_FLAG(23, 28, AtomicInt64OnGroupShared, "64-bit Atomics on Group S
 SHADER_FEATURE_FLAG(24, 29, DerivativesInMeshAndAmpShaders, "Derivatives in mesh and amplification shaders")
 SHADER_FEATURE_FLAG(25, 30, ResourceDescriptorHeapIndexing, "Resource descriptor heap indexing")
 SHADER_FEATURE_FLAG(26, 31, SamplerDescriptorHeapIndexing, "Sampler descriptor heap indexing")
-SHADER_FEATURE_FLAG(27, 63, RESERVED, "<RESERVED>")
+SHADER_FEATURE_FLAG(27, 36, RESERVED, "<RESERVED>")
 SHADER_FEATURE_FLAG(28, 32, AtomicInt64OnHeapResource, "64-bit Atomics on Heap Resources")
 SHADER_FEATURE_FLAG(29, 34, AdvancedTextureOps, "Advanced Texture Ops")
 SHADER_FEATURE_FLAG(30, 35, WriteableMSAATextures, "Writeable MSAA Textures")
+SHADER_FEATURE_FLAG(31, 37, SampleCmpWithGradientOrBias, "SampleCmp with gradient or bias")
+SHADER_FEATURE_FLAG(32, 38, ExtendedCommandInfo, "Extended command information")
 
-SHADER_FEATURE_FLAG(31, 36, NextUnusedBit, "Next reserved shader flag bit (not a flag)")
+SHADER_FEATURE_FLAG(33, 39, NextUnusedBit, "Next reserved shader flag bit (not a flag)")
 
 #undef SHADER_FEATURE_FLAG
 #endif // SHADER_FEATURE_FLAG
@@ -94,13 +96,13 @@ SHADER_VISIBILITY(7, Mesh)
 #ifdef DXIL_MODULE_FLAG
 
 // Only save DXIL module flags which not map to feature flags here.
-DXIL_MODULE_FLAG( 0,  DisableOptimizations,   "D3D11_1_SB_GLOBAL_FLAG_SKIP_OPTIMIZATION")
-DXIL_MODULE_FLAG( 1,  DisableMathRefactoring, "D3D10_SB_GLOBAL_FLAG_REFACTORING_ALLOWED")
-DXIL_MODULE_FLAG( 3,  ForceEarlyDepthStencil, "D3D11_SB_GLOBAL_FLAG_FORCE_EARLY_DEPTH_STENCIL")
-DXIL_MODULE_FLAG( 4,  EnableRawAndStructuredBuffers, "Raw and Structured buffers")
-DXIL_MODULE_FLAG( 5,  LowPrecisionPresent, "D3D11_1_SB_GLOBAL_FLAG_ENABLE_MINIMUM_PRECISION")
-DXIL_MODULE_FLAG( 8,  AllResourcesBound, "D3D12_SB_GLOBAL_FLAG_ALL_RESOURCES_BOUND")
-DXIL_MODULE_FLAG(23,  UseNativeLowPrecision, "Native 16bit types enabled")
+DXIL_MODULE_FLAG( 0,  DisableOptimizations,   "Disable shader optimizations")
+DXIL_MODULE_FLAG( 1,  DisableMathRefactoring, "Disable math refactoring")
+DXIL_MODULE_FLAG( 3,  ForceEarlyDepthStencil, "Force early depth-stencil test")
+DXIL_MODULE_FLAG( 4,  EnableRawAndStructuredBuffers, "Raw and structured buffers")
+DXIL_MODULE_FLAG( 5,  LowPrecisionPresent, "Low-precision data types")
+DXIL_MODULE_FLAG( 8,  AllResourcesBound, "All resources bound for the duration of shader execution")
+DXIL_MODULE_FLAG(23,  UseNativeLowPrecision, "Use native low precision")
 DXIL_MODULE_FLAG(33,  ResMayNotAlias, "Any UAV may not alias any other UAV")
 
 #undef DXIL_MODULE_FLAG

llvm/test/CodeGen/DirectX/ShaderFlags/disable-opt-cs.ll

@@ -5,7 +5,7 @@
 ; CHECK-NEXT: ; Shader Flags Value: 0x00000001
 
 ; CHECK: ; Note: extra DXIL module flags:
-; CHECK-NEXT: ;       D3D11_1_SB_GLOBAL_FLAG_SKIP_OPTIMIZATION
+; CHECK-NEXT: ;       Disable shader optimizations
 
 ; CHECK: ; Shader Flags for Module Functions
 ; CHECK: ; Function main : 0x00000000

llvm/test/CodeGen/DirectX/ShaderFlags/disable-opt-lib.ll

@@ -5,7 +5,7 @@
 ; CHECK-NEXT: ; Shader Flags Value: 0x00000001
 
 ; CHECK: ; Note: extra DXIL module flags:
-; CHECK-NEXT: ;       D3D11_1_SB_GLOBAL_FLAG_SKIP_OPTIMIZATION
+; CHECK-NEXT: ;       Disable shader optimizations
 
 ; CHECK: ; Shader Flags for Module Functions
 ; CHECK: ; Function main : 0x00000000

llvm/test/CodeGen/DirectX/ShaderFlags/low-precision.ll

@@ -7,7 +7,7 @@ target triple = "dxil-pc-shadermodel6.7-library"
 ;CHECK-NEXT: ;
 ;CHECK-NEXT: ; Note: shader requires additional functionality:
 ;CHECK-NEXT: ; Note: extra DXIL module flags:
-;CHECK-NEXT: ;       D3D11_1_SB_GLOBAL_FLAG_ENABLE_MINIMUM_PRECISION
+;CHECK-NEXT: ;       Low-precision data types
 ;CHECK-NEXT: ;
 ;CHECK-NEXT: ; Shader Flags for Module Functions
 

llvm/test/CodeGen/DirectX/ShaderFlags/raw-and-structured-buffers.ll

@@ -9,7 +9,7 @@ target triple = "dxil-pc-shadermodel6.7-library"
 ; CHECK-NEXT: Shader Flags Value: 0x00000010
 
 ; CHECK: Note: shader requires additional functionality:
-; CHECK:       Raw and Structured buffers
+; CHECK:       Raw and structured buffers
 
 ; CHECK: Function rawbuf : 0x00000010
 define float @rawbuf() "hlsl.export" {

llvm/test/CodeGen/DirectX/ShaderFlags/res-may-alias-0.ll

@@ -10,7 +10,7 @@ target triple = "dxil-pc-shadermodel6.8-library"
 ; CHECK-NEXT: Shader Flags Value: 0x200000010
 
 ; CHECK: Note: extra DXIL module flags:
-; CHECK:       Raw and Structured buffers
+; CHECK:       Raw and structured buffers
 ; CHECK:       Any UAV may not alias any other UAV
 ;
 

llvm/test/CodeGen/DirectX/ShaderFlags/res-may-alias-1.ll

@@ -10,7 +10,7 @@ target triple = "dxil-pc-shadermodel6.8-library"
 ; CHECK-NEXT: Shader Flags Value: 0x00000010
 
 ; CHECK: Note: extra DXIL module flags:
-; CHECK:       Raw and Structured buffers
+; CHECK:       Raw and structured buffers
 ; CHECK-NOT:   Any UAV may not alias any other UAV
 ;
 

llvm/test/CodeGen/DirectX/ShaderFlags/res-may-not-alias-sm6.6.ll

@@ -10,7 +10,7 @@ target triple = "dxil-pc-shadermodel6.6-library"
 ; CHECK-NEXT: Shader Flags Value: 0x00000010
 
 ; CHECK: Note: extra DXIL module flags:
-; CHECK:       Raw and Structured buffers
+; CHECK:       Raw and structured buffers
 ; CHECK-NOT:   Any UAV may not alias any other UAV
 ;
 

llvm/test/CodeGen/DirectX/ShaderFlags/res-may-not-alias-sm6.7.ll

@@ -11,7 +11,7 @@ target triple = "dxil-pc-shadermodel6.7-library"
 ; CHECK-NEXT: Shader Flags Value: 0x200000010
 
 ; CHECK: Note: extra DXIL module flags:
-; CHECK:       Raw and Structured buffers
+; CHECK:       Raw and structured buffers
 ; CHECK:       Any UAV may not alias any other UAV
 ;
 

llvm/test/CodeGen/DirectX/ShaderFlags/res-may-not-alias-valver1.8.ll

@@ -11,7 +11,7 @@ target triple = "dxil-pc-shadermodel6.7-library"
 ; CHECK-NEXT: Shader Flags Value: 0x200000010
 
 ; CHECK: Note: extra DXIL module flags:
-; CHECK:       Raw and Structured buffers
+; CHECK:       Raw and structured buffers
 ; CHECK:       Any UAV may not alias any other UAV
 ;