| Issue |
180107
|
| Summary |
mlir-opt crash: xegpu.dpas conversion to xeVM fails with unsupported xevm::ElemType
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
xvv4402
|
**MLIR Version**: 22.1.0
**Bug Op**: xegpu.dpas
**Bug Pass**: --convert-xegpu-to-xevm
**Detailed Description**: The mlir-opt tool hits a llvm_unreachable during the conversion of xegpu.dpas to xeVM. The crash occurs in DpasToXeVMPattern when the operation uses i32 element types. The converter triggers "unsupported xevm::ElemType" and terminates, indicating that the lowering path for i32 DPAS operations is either unimplemented or missing type validation.
```mlir
module {
func.func @main() {
%0 = spirv.Constant dense<0> : vector<4xi32>
%1 = vector.constant_mask [4] : vector<4xi1>
%2 = llvm.add %0, %0 : vector<4xi32>
%3 = spirv.SLessThanEqual %2, %0 : vector<4xi32>
%4 = spirv.Not %2 : vector<4xi32>
%5 = xegpu.dpas %2, %0 : vector<4xi32>, vector<4xi32> -> vector<4xi32>
return
}
}
```
```
mlir-opt --convert-xegpu-to-xevm temp.mlir
```
```
unsupported xevm::ElemType
UNREACHABLE executed at llvm-project-llvmorg-22.1.0-rc1/mlir/lib/Conversion/XeGPUToXeVM/XeGPUToXeVM.cpp:969!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: llvmorg-22.1.0-install/bin/mlir-opt --convert-xegpu-to-xevm temp.mlir
#0 0x000059c2de758e32 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (llvmorg-22.1.0-install/bin/mlir-opt+0x252fe32)
#1 0x000059c2de7555af llvm::sys::RunSignalHandlers() (llvmorg-22.1.0-install/bin/mlir-opt+0x252c5af)
#2 0x000059c2de7556fc SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x000072870f445330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x000072870f49eb2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#5 0x000072870f49eb2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#6 0x000072870f49eb2c pthread_kill ./nptl/pthread_kill.c:89:10
#7 0x000072870f44527e raise ./signal/../sysdeps/posix/raise.c:27:6
#8 0x000072870f4288ff abort ./stdlib/abort.c:81:7
#9 0x000059c2de73812e (llvmorg-22.1.0-install/bin/mlir-opt+0x250f12e)
#10 0x000059c2e22cb816 (anonymous namespace)::DpasToXeVMPattern::matchAndRewrite(mlir::xegpu::DpasOp, mlir::xegpu::DpasOpAdaptor, mlir::ConversionPatternRewriter&) const XeGPUToXeVM.cpp:0:0
#11 0x000059c2e22c70ec llvm::LogicalResult mlir::ConversionPattern::dispatchTo1To1<mlir::OpConversionPattern<mlir::xegpu::DpasOp>, mlir::xegpu::DpasOp>(mlir::OpConversionPattern<mlir::xegpu::DpasOp> const&, mlir::xegpu::DpasOp, mlir::xegpu::DpasOp::GenericAdaptor<llvm::ArrayRef<mlir::ValueRange>>, mlir::ConversionPatternRewriter&) (llvmorg-22.1.0-install/bin/mlir-opt+0x609e0ec)
#12 0x000059c2e22c723e mlir::OpConversionPattern<mlir::xegpu::DpasOp>::matchAndRewrite(mlir::Operation*, llvm::ArrayRef<mlir::ValueRange>, mlir::ConversionPatternRewriter&) const (llvmorg-22.1.0-install/bin/mlir-opt+0x609e23e)
```
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