[llvm] bbbdb23 - [DirectX] Set module-level flag `LowPrecisionPresent` in DXIL Shader Flags Analysis (#129109)
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Tue Mar 4 09:38:02 PST 2025
Author: Deric C.
Date: 2025-03-04T09:37:59-08:00
New Revision: bbbdb23c33ef56a518072754f4dc4d123655276d
URL: https://github.com/llvm/llvm-project/commit/bbbdb23c33ef56a518072754f4dc4d123655276d
DIFF: https://github.com/llvm/llvm-project/commit/bbbdb23c33ef56a518072754f4dc4d123655276d.diff
LOG: [DirectX] Set module-level flag `LowPrecisionPresent` in DXIL Shader Flags Analysis (#129109)
Fixes #114561
Added:
llvm/test/CodeGen/DirectX/ShaderFlags/low-precision.ll
Modified:
llvm/lib/Target/DirectX/DXILShaderFlags.cpp
Removed:
################################################################################
diff --git a/llvm/lib/Target/DirectX/DXILShaderFlags.cpp b/llvm/lib/Target/DirectX/DXILShaderFlags.cpp
index e1cf516758663..31fbd66dfaa2d 100644
--- a/llvm/lib/Target/DirectX/DXILShaderFlags.cpp
+++ b/llvm/lib/Target/DirectX/DXILShaderFlags.cpp
@@ -99,6 +99,19 @@ void ModuleShaderFlags::updateFunctionFlags(ComputedShaderFlags &CSF,
}
}
+ if (!CSF.LowPrecisionPresent)
+ CSF.LowPrecisionPresent =
+ I.getType()->isIntegerTy(16) || I.getType()->isHalfTy();
+
+ if (!CSF.LowPrecisionPresent) {
+ for (const Value *Op : I.operands()) {
+ if (Op->getType()->isIntegerTy(16) || Op->getType()->isHalfTy()) {
+ CSF.LowPrecisionPresent = true;
+ break;
+ }
+ }
+ }
+
if (auto *II = dyn_cast<IntrinsicInst>(&I)) {
switch (II->getIntrinsicID()) {
default:
diff --git a/llvm/test/CodeGen/DirectX/ShaderFlags/low-precision.ll b/llvm/test/CodeGen/DirectX/ShaderFlags/low-precision.ll
new file mode 100644
index 0000000000000..fd25a165bfe8d
--- /dev/null
+++ b/llvm/test/CodeGen/DirectX/ShaderFlags/low-precision.ll
@@ -0,0 +1,38 @@
+; 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: ; Combined Shader Flags for Module
+;CHECK-NEXT: ; Shader Flags Value: 0x00000020
+;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: ;
+;CHECK-NEXT: ; Shader Flags for Module Functions
+
+;CHECK-LABEL: ; Function add_i16 : 0x00000020
+define i16 @add_i16(i16 %a, i16 %b) #0 {
+ %sum = add i16 %a, %b
+ ret i16 %sum
+}
+
+;CHECK-LABEL: ; Function add_i32 : 0x00000000
+define i32 @add_i32(i32 %a, i32 %b) #0 {
+ %sum = add i32 %a, %b
+ ret i32 %sum
+}
+
+;CHECK-LABEL: ; Function add_half : 0x00000020
+define half @add_half(half %a, half %b) #0 {
+ %sum = fadd half %a, %b
+ ret half %sum
+}
+
+attributes #0 = { convergent norecurse nounwind "hlsl.export"}
+
+; DXC: - Name: SFI0
+; DXC-NEXT: Size: 8
+; DXC-NOT: Flags:
+; DXC: ...
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