libNVVM API

libNVVM API v4.0 Reference Manual

1. libNVVM API

1.1. Introduction

libNVVM API provides an interface for generating PTX code from both binary and text NVVM IR inputs. Compatible input can be generated by tools and libraries that produce LLVM 7.0 IR and bitcode. Support for reading the text NVVM IR representation is deprecated and may be removed in a later release.

1.2. Thread Safety

libNVVM API provides a thread-safe interface to libNVVM. Clients can take advantage of improved compilation speeds by spawning multiple compilation threads concurrently.

1.3. Module

This chapter presents the API of the libNVVM library. Here is a list of all modules:

Error Handling

General Information Query

Compilation

2. Error Handling

Enumerations

nvvmResult: NVVM API call result code.

Functions

const char * nvvmGetErrorString(nvvmResult result): Get the message string for the given nvvmResult code.

2.1. Enumerations

enum nvvmResult

NVVM API call result code.

Values:

enumerator NVVM_SUCCESS

enumerator NVVM_ERROR_OUT_OF_MEMORY

enumerator NVVM_ERROR_PROGRAM_CREATION_FAILURE

enumerator NVVM_ERROR_IR_VERSION_MISMATCH

enumerator NVVM_ERROR_INVALID_INPUT

enumerator NVVM_ERROR_INVALID_PROGRAM

enumerator NVVM_ERROR_INVALID_IR

enumerator NVVM_ERROR_INVALID_OPTION

enumerator NVVM_ERROR_NO_MODULE_IN_PROGRAM

enumerator NVVM_ERROR_COMPILATION

2.2. Functions

const char *nvvmGetErrorString(nvvmResult result)

Get the message string for the given nvvmResult code.

Parameters: result – [in] NVVM API result code.
Returns: Message string for the given nvvmResult code.

3. General Information Query

Functions

nvvmResult nvvmIRVersion(int *majorIR, int *minorIR, int *majorDbg, int *minorDbg): Get the NVVM IR version.
nvvmResult nvvmVersion(int *major, int *minor): Get the NVVM version.

3.1. Functions

nvvmResult nvvmIRVersion(int *majorIR, int *minorIR, int *majorDbg, int *minorDbg)

Get the NVVM IR version.

Parameters

majorIR – [out] NVVM IR major version number.
minorIR – [out] NVVM IR minor version number.
majorDbg – [out] NVVM IR debug metadata major version number.
minorDbg – [out] NVVM IR debug metadata minor version number.

Returns

NVVM_SUCCESS

nvvmResult nvvmVersion(int *major, int *minor)

Get the NVVM version.

Parameters

major – [out] NVVM major version number.
minor – [out] NVVM minor version number.

Returns

NVVM_SUCCESS

4. Compilation

Functions

nvvmResult nvvmAddModuleToProgram(nvvmProgram prog, const char *buffer, size_t size, const char *name): Add a module level NVVM IR to a program.
nvvmResult nvvmCompileProgram(nvvmProgram prog, int numOptions, const char **options): Compile the NVVM program.
nvvmResult nvvmCreateProgram(nvvmProgram *prog): Create a program, and set the value of its handle to *prog .
nvvmResult nvvmDestroyProgram(nvvmProgram *prog): Destroy a program.
nvvmResult nvvmGetCompiledResult(nvvmProgram prog, char *buffer): Get the compiled result.
nvvmResult nvvmGetCompiledResultSize(nvvmProgram prog, size_t *bufferSizeRet): Get the size of the compiled result.
nvvmResult nvvmGetProgramLog(nvvmProgram prog, char *buffer): Get the Compiler/Verifier Message.
nvvmResult nvvmGetProgramLogSize(nvvmProgram prog, size_t *bufferSizeRet): Get the Size of Compiler/Verifier Message.
nvvmResult nvvmLazyAddModuleToProgram(nvvmProgram prog, const char *buffer, size_t size, const char *name): Add a module level NVVM IR to a program.
nvvmResult nvvmVerifyProgram(nvvmProgram prog, int numOptions, const char **options): Verify the NVVM program.

Typedefs

nvvmProgram: NVVM Program.

4.1. Functions

nvvmResult nvvmAddModuleToProgram(nvvmProgram prog, const char *buffer, size_t size, const char *name)

Add a module level NVVM IR to a program.

The buffer should contain an NVVM IR module. The module should have NVVM IR either in the LLVM 7.0.1 bitcode representation or in the LLVM 7.0.1 text representation. Support for reading the text representation of NVVM IR is deprecated and may be removed in a later version.

Parameters

prog – [in] NVVM program.
buffer – [in] NVVM IR module in the bitcode or text representation.
size – [in] Size of the NVVM IR module.
name – [in] Name of the NVVM IR module. If NULL, “<unnamed>” is used as the name.

Returns

NVVM_SUCCESS
NVVM_ERROR_OUT_OF_MEMORY
NVVM_ERROR_INVALID_INPUT
NVVM_ERROR_INVALID_PROGRAM

nvvmResult nvvmCompileProgram(nvvmProgram prog, int numOptions, const char **options)

Compile the NVVM program.

The NVVM IR modules in the program will be linked at the IR level. The linked IR program is compiled to PTX.

The target datalayout in the linked IR program is used to determine the address size (32bit vs 64bit).

The valid compiler options are:

-g (enable generation of full debugging information). Full debug support is only valid with ‘-opt=0’. Debug support requires the input module to utilize NVVM IR Debug Metadata. Line number (line info) only generation is also enabled via NVVM IR Debug Metadata, there is no specific libNVVM API flag for that case.
-opt=
- 0 (disable optimizations)
- 3 (default, enable optimizations)
-arch=
- compute_50
- compute_52 (default)
- compute_53
- compute_60
- compute_61
- compute_62
- compute_70
- compute_72
- compute_75
- compute_80
- compute_87
- compute_89
- compute_90
-ftz=
- 0 (default, preserve denormal values, when performing single-precision floating-point operations)
- 1 (flush denormal values to zero, when performing single-precision floating-point operations)
-prec-sqrt=
- 0 (use a faster approximation for single-precision floating-point square root)
- 1 (default, use IEEE round-to-nearest mode for single-precision floating-point square root)
-prec-div=
- 0 (use a faster approximation for single-precision floating-point division and reciprocals)
- 1 (default, use IEEE round-to-nearest mode for single-precision floating-point division and reciprocals)
-fma=
- 0 (disable FMA contraction)
- 1 (default, enable FMA contraction)
-jump-table-density=[0-101] Specify the case density percentage in switch statements, and use it as a minimal threshold to determine whether jump table(brx.idx instruction) will be used to implement a switch statement. Default value is 101. The percentage ranges from 0 to 101 inclusively.
-gen-lto (Generate LTO IR instead of PTX).

Parameters

prog – [in] NVVM program.
numOptions – [in] Number of compiler options passed.
options – [in] Compiler options in the form of C string array.

Returns

NVVM_SUCCESS
NVVM_ERROR_OUT_OF_MEMORY
NVVM_ERROR_IR_VERSION_MISMATCH
NVVM_ERROR_INVALID_PROGRAM
NVVM_ERROR_INVALID_OPTION
NVVM_ERROR_NO_MODULE_IN_PROGRAM
NVVM_ERROR_COMPILATION

nvvmResult nvvmCreateProgram(nvvmProgram *prog)

Create a program, and set the value of its handle to *prog.

4.2. Typedefs

typedef struct _nvvmProgram *nvvmProgram

NVVM Program.

An opaque handle for a program.

5. Notices

5.1. Notice

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5.2. OpenCL

OpenCL is a trademark of Apple Inc. used under license to the Khronos Group Inc.

5.3. Trademarks

NVIDIA and the NVIDIA logo are trademarks or registered trademarks of NVIDIA Corporation in the U.S. and other countries. Other company and product names may be trademarks of the respective companies with which they are associated.