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[flang][OpenMP] Fix reduction init region block management #122079
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48 changes: 48 additions & 0 deletions
48
mlir/test/Target/LLVMIR/openmp-parallel-reduction-init.mlir
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| // RUN: mlir-translate -mlir-to-llvmir -split-input-file %s | FileCheck %s | ||
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| // Regression test for https://github.com/llvm/llvm-project/issues/120254. | ||
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| omp.declare_reduction @add_reduction : !llvm.ptr alloc { | ||
| %0 = llvm.mlir.constant(1 : i64) : i64 | ||
| %1 = llvm.alloca %0 x !llvm.struct<(ptr)> : (i64) -> !llvm.ptr | ||
| omp.yield(%1 : !llvm.ptr) | ||
| } init { | ||
| ^bb0(%arg0: !llvm.ptr, %arg1: !llvm.ptr): | ||
| %6 = llvm.mlir.constant(1 : i32) : i32 | ||
| "llvm.intr.memcpy"(%arg1, %arg0, %6) <{isVolatile = false}> : (!llvm.ptr, !llvm.ptr, i32) -> () | ||
| omp.yield(%arg1 : !llvm.ptr) | ||
| } combiner { | ||
| ^bb0(%arg0: !llvm.ptr, %arg1: !llvm.ptr): | ||
| omp.yield(%arg0 : !llvm.ptr) | ||
| } cleanup { | ||
| ^bb0(%arg0: !llvm.ptr): | ||
| omp.yield | ||
| } | ||
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| llvm.func @use_reduction() attributes {fir.bindc_name = "test"} { | ||
| %6 = llvm.mlir.constant(1 : i32) : i32 | ||
| omp.parallel { | ||
| %18 = llvm.mlir.constant(1 : i64) : i64 | ||
| %19 = llvm.alloca %18 x !llvm.struct<(ptr)> : (i64) -> !llvm.ptr | ||
| omp.wsloop reduction(byref @add_reduction %19 -> %arg0 : !llvm.ptr) { | ||
| omp.loop_nest (%arg1) : i32 = (%6) to (%6) inclusive step (%6) { | ||
| omp.yield | ||
| } | ||
| } | ||
| omp.terminator | ||
| } | ||
| llvm.return | ||
| } | ||
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| // CHECK: omp.par.entry: | ||
| // CHECK: %[[RED_REGION_ALLOC:.*]] = alloca { ptr }, i64 1, align 8 | ||
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| // CHECK: omp.par.region: | ||
| // CHECK: br label %omp.par.region1 | ||
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| // CHECK: omp.par.region1: | ||
| // CHECK: %[[PAR_REG_VAL:.*]] = alloca { ptr }, i64 1, align 8 | ||
| // CHECK: br label %omp.reduction.init | ||
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| // CHECK: omp.reduction.init: | ||
| // CHECK: call void @llvm.memcpy{{.*}}(ptr %[[RED_REGION_ALLOC]], ptr %[[PAR_REG_VAL]], {{.*}}) |
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What worries me about removing this is that now the function is that now
initReductionVarsdepends on what the current insertion point inside of the builder is.It isn't obvious to me what the right insertion point for the builder should be when calling this function. Please could you document what assumptions
initReductionVarsis now making.There was a problem hiding this comment.
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Added some docs to explain the pre- and post-conditions of the functions. Let me know if something needs to be clarified further.