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Open
9 tasks
Tracked by #99235
farzonl opened this issue Jul 16, 2024 · 0 comments
Open
9 tasks
Tracked by #99235

Implement the printf HLSL Function #99140

farzonl opened this issue Jul 16, 2024 · 0 comments
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backend:SPIR-V bot:HLSL HLSL HLSL Language Support metabug Issue to collect references to a group of similar or related issues.

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@farzonl
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farzonl commented Jul 16, 2024

  • Implement printf clang builtin,
  • Link printf clang builtin with hlsl_intrinsics.h
  • Add sema checks for printf to CheckHLSLBuiltinFunctionCall in SemaChecking.cpp
  • Add codegen for printf to EmitHLSLBuiltinExpr in CGBuiltin.cpp
  • Add codegen tests to clang/test/CodeGenHLSL/builtins/printf.hlsl
  • Add sema tests to clang/test/SemaHLSL/BuiltIns/printf-errors.hlsl
  • Create the int_spv_printf intrinsic in IntrinsicsSPIRV.td
  • In SPIRVInstructionSelector.cpp create the printf lowering and map it to int_spv_printf in SPIRVInstructionSelector::selectIntrinsic.
  • Create SPIR-V backend test case in llvm/test/CodeGen/SPIRV/hlsl-intrinsics/printf.ll

DirectX

There is no support for printf when targeting DirectX.

SPIR-V

See "Using Debug Printf in HLSL Shaders" in https://vulkan.lunarg.com/doc/sdk/1.3.283.0/windows/debug_printf.html

Test Case(s)

Example 1

//dxc printf_test.hlsl -T lib_6_8 -enable-16bit-types -O0

export void fn(string p1) {
    return printf(p1);
}

HLSL:

Submits a custom shader message to the information queue.

Syntax

void printf(
   string format,
    argument ...
);

Parameters

format

The format string.

argument ...

Optional arguments.

Return value

This function does not return a value.

Remarks

This operation does nothing on devices that do not support it.

Minimum Shader Model

This function is supported in the following shader models.

Shader Model Supported
Shader Model 4 (DirectX HLSL) or later. yes

 

See also

Intrinsic Functions

@farzonl farzonl added backend:SPIR-V bot:HLSL HLSL HLSL Language Support metabug Issue to collect references to a group of similar or related issues. labels Jul 16, 2024
@damyanp damyanp moved this to Ready in HLSL Support Oct 30, 2024
@damyanp damyanp moved this from Ready to Planning in HLSL Support Oct 30, 2024
@pow2clk pow2clk moved this from Planning to Designing in HLSL Support Nov 19, 2024
@damyanp damyanp removed the status in HLSL Support Apr 25, 2025
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