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[DirectX] Set module-level flag LowPrecisionPresent in DXIL Shader Flags Analysis (#129109)

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Fixes #114561
This commit is contained in:
Deric C.
2025-03-04 09:37:59 -08:00
committed by GitHub
parent 25a29cef31
commit bbbdb23c33
2 changed files with 51 additions and 0 deletions
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13
llvm/lib/Target/DirectX/DXILShaderFlags.cpp
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@@ -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:

38
llvm/test/CodeGen/DirectX/ShaderFlags/low-precision.ll Normal file
View File

@@ -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: ...