Shintaro Iwasaki
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3c635449e5
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[Triton] Support math and libdevice ops (#91)
This PR adds basic math ops by using `MathDialect` and `libdevice` ops by using `extern_elementwise`. This is needed to compile some tutorial code (e.g., `softmax`). This PR implements only interface till PTX (so from frontend to TritonGPU-MLIR)
- Currently till TritonGPU. It cannot be lowered to PTX now.
- No special optimizations (e.g., constant folding etc) are applied.
- 14.x does not define folders for many operators for math ops, but 15.x seems to increase its coverage: https://github.com/llvm/llvm-project/blob/llvmorg-15.0.0-rc3/mlir/include/mlir/Dialect/Math/IR/MathOps.td
- No constant folding etc for `libdevice` ops.
```py
import triton
import triton.language as tl
import sys
@triton.jit
def add_kernel(
x_ptr,
y_ptr,
BLOCK_SIZE: tl.constexpr,
):
offsets = tl.arange(0, BLOCK_SIZE)
x = tl.load(x_ptr + offsets)
x = tl.sin(x)
output = tl.libdevice.sin(x)
output = tl.libdevice.fdiv_rn(output, output)
output = tl.libdevice.fmaf_rd(output, output, output)
tl.store(y_ptr + offsets, output)
if __name__ == "__main__" and len(sys.argv) >= 2:
signature = "*fp32,*fp32"
constants = {'BLOCK_SIZE': 1024}
output = triton.compile(add_kernel, signature, device=0, constants=constants, output="ttgir")
print(output)
```
->
```llvm
#blocked = #triton_gpu.blocked<{sizePerThread = [1], threadsPerWarp = [32], warpsPerCTA = [4], order = [0]}>
module attributes {"triton_gpu.num-warps" = 4 : i32} {
func @add_kernel__Pfp32_Pfp32__2c1024(%arg0: !tt.ptr<f32>, %arg1: !tt.ptr<f32>) {
%0 = tt.make_range {end = 1024 : i32, start = 0 : i32} : tensor<1024xi32, #blocked>
%1 = tt.splat %arg0 : (!tt.ptr<f32>) -> tensor<1024x!tt.ptr<f32>, #blocked>
%2 = tt.getelementptr %1, %0 : tensor<1024x!tt.ptr<f32>, #blocked>
%3 = tt.load %2 {cache = 1 : i32, evict = 1 : i32, isVolatile = false} : tensor<1024xf32, #blocked>
%4 = math.sin %3 : tensor<1024xf32, #blocked>
%5 = tt.ext_elemwise %4 {libname = "libdevice", libpath = "/home/siwasaki/triton/python/triton/language/libdevice.10.bc", symbol = "__nv_sinf"} : tensor<1024xf32, #blocked> -> tensor<1024xf32, #blocked>
%6 = tt.ext_elemwise %5, %5 {libname = "libdevice", libpath = "/home/siwasaki/triton/python/triton/language/libdevice.10.bc", symbol = "__nv_fdiv_rn"} : tensor<1024xf32, #blocked>, tensor<1024xf32, #blocked> -> tensor<1024xf32, #blocked>
%7 = tt.ext_elemwise %6, %6, %6 {libname = "libdevice", libpath = "/home/siwasaki/triton/python/triton/language/libdevice.10.bc", symbol = "__nv_fmaf_rd"} : tensor<1024xf32, #blocked>, tensor<1024xf32, #blocked>, tensor<1024xf32, #blocked> -> tensor<1024xf32, #blocked>
%8 = tt.splat %arg1 : (!tt.ptr<f32>) -> tensor<1024x!tt.ptr<f32>, #blocked>
%9 = tt.getelementptr %8, %0 : tensor<1024x!tt.ptr<f32>, #blocked>
tt.store %9, %7 : tensor<1024xf32, #blocked>
return
}
}
```
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2022-09-01 16:34:27 -07:00 |
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