Thanks for using Compiler Explorer
Sponsors
Jakt
C++
Ada
Analysis
Android Java
Android Kotlin
Assembly
C
C3
Carbon
C++ (Circle)
CIRCT
Clean
CMake
CMakeScript
COBOL
C++ for OpenCL
MLIR
Cppx
Cppx-Blue
Cppx-Gold
Cpp2-cppfront
Crystal
C#
CUDA C++
D
Dart
Elixir
Erlang
Fortran
F#
Go
Haskell
HLSL
Hook
Hylo
ispc
Java
Julia
Kotlin
LLVM IR
LLVM MIR
Modula-2
Nim
Objective-C
Objective-C++
OCaml
OpenCL C
Pascal
Pony
Python
Racket
Ruby
Rust
Snowball
Scala
Solidity
Spice
Swift
LLVM TableGen
Toit
TypeScript Native
V
Vala
Visual Basic
WASM
Zig
Javascript
GIMPLE
cuda source #1
Output
Compile to binary object
Link to binary
Execute the code
Intel asm syntax
Demangle identifiers
Verbose demangling
Filters
Unused labels
Library functions
Directives
Comments
Horizontal whitespace
Debug intrinsics
Compiler
10.0.0 sm_75 CUDA-10.2
10.0.1 sm_75 CUDA-10.2
11.0.0 sm_75 CUDA-10.2
NVCC 10.0.130
NVCC 10.1.105
NVCC 10.1.168
NVCC 10.1.243
NVCC 10.2.89
NVCC 11.0.2
NVCC 11.0.3
NVCC 11.1.0
NVCC 11.1.1
NVCC 11.2.0
NVCC 11.2.1
NVCC 11.2.2
NVCC 11.3.0
NVCC 11.3.1
NVCC 11.4.0
NVCC 11.4.1
NVCC 11.4.2
NVCC 11.4.3
NVCC 11.4.4
NVCC 11.5.0
NVCC 11.5.1
NVCC 11.5.2
NVCC 11.6.0
NVCC 11.6.1
NVCC 11.6.2
NVCC 11.7.0
NVCC 11.7.1
NVCC 11.8.0
NVCC 12.0.0
NVCC 12.0.1
NVCC 12.1.0
NVCC 12.2.1
NVCC 12.3.1
NVCC 12.4.1
NVCC 12.5.1
NVCC 9.1.85
NVCC 9.2.88
NVRTC 11.0.2
NVRTC 11.0.3
NVRTC 11.1.0
NVRTC 11.1.1
NVRTC 11.2.0
NVRTC 11.2.1
NVRTC 11.2.2
NVRTC 11.3.0
NVRTC 11.3.1
NVRTC 11.4.0
NVRTC 11.4.1
NVRTC 11.5.0
NVRTC 11.5.1
NVRTC 11.5.2
NVRTC 11.6.0
NVRTC 11.6.1
NVRTC 11.6.2
NVRTC 11.7.0
NVRTC 11.7.1
NVRTC 11.8.0
NVRTC 12.0.0
NVRTC 12.0.1
NVRTC 12.1.0
clang 7.0.0 sm_70 CUDA-9.1
clang 8.0.0 sm_75 CUDA-10.0
clang 9.0.0 sm_75 CUDA-10.1
clang rocm-4.5.2
clang rocm-5.0.2
clang rocm-5.1.3
clang rocm-5.2.3
clang rocm-5.3.2
clang rocm-5.7.0
clang rocm-6.0.2
clang rocm-6.1.2
clang staging rocm-6.1.2
clang trunk rocm-6.1.2
trunk sm_86 CUDA-11.3
Options
Source code
// NVIDIA's PTX assembly language has special registers, which are read-only variables // accessible through the `mov` or `cvt` instructions. Special registers have alphanumeric // names, and are referenced in PTX assembly in the same way that registers are; by prefixing // the special register name with `%`. // // However, Clang CUDA seems to reject the use of PTX special registers in inline assembly // when they are prefixed with only a single `%`. Clang CUDA does accept the use of special // registers when they are prefixed with '%%' instead. NVCC appears to also accept this, // although it is not documented. // // My guess is that '%%' is an escape sequence in both cases, passing a single `%` through // to the actual assembler. // // It would be nice if Clang CUDA supported the use of PTX special registers prefixed by a // single `%` for consistency with NVCC. // // https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#special-registers using u32 = long unsigned; using u64 = long long unsigned; extern __device__ u64 now0() { u64 time; asm volatile ("mov.u64 %0, %%globaltimer;":"=l"(time)::); return time; } extern __device__ u64 now1() { u64 time; asm volatile ("mov.u64 %0, %globaltimer;":"=l"(time)::); return time; } extern __device__ u64 timestamp0() { u64 time; asm volatile ("mov.u64 %0, %%clock64;":"=l"(time)::); return time; } extern __device__ u64 timestamp1() { u64 time; asm volatile ("mov.u64 %0, %clock64;":"=l"(time)::); return time; } extern __device__ u32 total_smem_size0() { u32 size; asm volatile ("mov.u32 %0, %%total_smem_size;":"=l"(size)::); return size; } extern __device__ u32 total_smem_size1() { u32 size; asm volatile ("mov.u32 %0, %total_smem_size;":"=l"(size)::); return size; } extern __device__ u32 laneid0() { u32 size; asm volatile ("mov.u32 %0, %%laneid;":"=l"(size)::); return size; } extern __device__ u32 laneid1() { u32 size; asm volatile ("mov.u32 %0, %laneid;":"=l"(size)::); return size; }
Become a Patron
Sponsor on GitHub
Donate via PayPal
Source on GitHub
Mailing list
Installed libraries
Wiki
Report an issue
How it works
Contact the author
CE on Mastodon
About the author
Statistics
Changelog
Version tree