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llvm-project/mlir/test/Target/LLVMIR/openmp-cli-canonical_loop.mlir
Michael Kruse 96bc07d492
[MLIR][OpenMP] Add canonical loop LLVM-IR lowering (#147069) 
Support for translating the operations introduced in #144785 to LLVM-IR.

In order to keep the lowering simple,
`OpenMPIRBuider::unrollLoopHeuristic` is applied when encountering the
`omp.unroll_heuristic` op. As a result, the operation that unrolling is
applied to (`omp.canonical_loop`) must have been emitted before even
though logically there is no such requirement.

Eventually, all transformations on a loop must be applied directly after
emitting `omp.canonical_loop`, i.e. future transformations must be
looked-up when encountering `omp.canonical_loop` itself. This is because
many OpenMPIRBuilder methods (e.g. `createParallel`) expect all the
region code to be emitted withing a callback. In the case of
`createParallel`, the region code is getting outlined into a new
function. Therefore, making the operation order a formal requirement
would not make the implementation any easier.
2025-07-11 12:54:25 +02:00

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// Test lowering of standalone omp.canonical_loop
// RUN: mlir-translate -mlir-to-llvmir %s | FileCheck %s
// CHECK-LABEL: define void @anon_loop(
// CHECK-SAME: ptr %[[ptr:.+]],
// CHECK-SAME: i32 %[[tc:.+]]) {
// CHECK-NEXT: br label %omp_omp.loop.preheader
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.preheader:
// CHECK-NEXT: br label %omp_omp.loop.header
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.header:
// CHECK-NEXT: %omp_omp.loop.iv = phi i32 [ 0, %omp_omp.loop.preheader ], [ %omp_omp.loop.next, %omp_omp.loop.inc ]
// CHECK-NEXT: br label %omp_omp.loop.cond
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.cond:
// CHECK-NEXT: %omp_omp.loop.cmp = icmp ult i32 %omp_omp.loop.iv, %[[tc]]
// CHECK-NEXT: br i1 %omp_omp.loop.cmp, label %omp_omp.loop.body, label %omp_omp.loop.exit
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.body:
// CHECK-NEXT: br label %omp.loop.region
// CHECK-EMPTY:
// CHECK-NEXT: omp.loop.region:
// CHECK-NEXT: store float 4.200000e+01, ptr %[[ptr]], align 4
// CHECK-NEXT: br label %omp.region.cont
// CHECK-EMPTY:
// CHECK-NEXT: omp.region.cont:
// CHECK-NEXT: br label %omp_omp.loop.inc
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.inc:
// CHECK-NEXT: %omp_omp.loop.next = add nuw i32 %omp_omp.loop.iv, 1
// CHECK-NEXT: br label %omp_omp.loop.header
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.exit:
// CHECK-NEXT: br label %omp_omp.loop.after
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.after:
// CHECK-NEXT: ret void
// CHECK-NEXT: }
llvm.func @anon_loop(%ptr: !llvm.ptr, %tc : i32) -> () {
omp.canonical_loop %iv : i32 in range(%tc) {
%val = llvm.mlir.constant(42.0 : f32) : f32
llvm.store %val, %ptr : f32, !llvm.ptr
omp.terminator
}
llvm.return
}
// CHECK-LABEL: define void @trivial_loop(
// CHECK-SAME: ptr %[[ptr:.+]],
// CHECK-SAME: i32 %[[tc:.+]]) {
// CHECK-NEXT: br label %omp_omp.loop.preheader
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.preheader:
// CHECK-NEXT: br label %omp_omp.loop.header
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.header:
// CHECK-NEXT: %omp_omp.loop.iv = phi i32 [ 0, %omp_omp.loop.preheader ], [ %omp_omp.loop.next, %omp_omp.loop.inc ]
// CHECK-NEXT: br label %omp_omp.loop.cond
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.cond:
// CHECK-NEXT: %omp_omp.loop.cmp = icmp ult i32 %omp_omp.loop.iv, %[[tc]]
// CHECK-NEXT: br i1 %omp_omp.loop.cmp, label %omp_omp.loop.body, label %omp_omp.loop.exit
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.body:
// CHECK-NEXT: br label %omp.loop.region
// CHECK-EMPTY:
// CHECK-NEXT: omp.loop.region:
// CHECK-NEXT: store float 4.200000e+01, ptr %[[ptr]], align 4
// CHECK-NEXT: br label %omp.region.cont
// CHECK-EMPTY:
// CHECK-NEXT: omp.region.cont:
// CHECK-NEXT: br label %omp_omp.loop.inc
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.inc:
// CHECK-NEXT: %omp_omp.loop.next = add nuw i32 %omp_omp.loop.iv, 1
// CHECK-NEXT: br label %omp_omp.loop.header
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.exit:
// CHECK-NEXT: br label %omp_omp.loop.after
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.after:
// CHECK-NEXT: ret void
// CHECK-NEXT: }
llvm.func @trivial_loop(%ptr: !llvm.ptr, %tc : i32) -> () {
%cli = omp.new_cli
omp.canonical_loop(%cli) %iv : i32 in range(%tc) {
%val = llvm.mlir.constant(42.0 : f32) : f32
llvm.store %val, %ptr : f32, !llvm.ptr
omp.terminator
}
llvm.return
}
// CHECK-LABEL: define void @nested_loop(
// CHECK-SAME: ptr %[[ptr:.+]], i32 %[[outer_tc:.+]], i32 %[[inner_tc:.+]]) {
// CHECK-NEXT: br label %omp_omp.loop.preheader
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.preheader:
// CHECK-NEXT: br label %omp_omp.loop.header
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.header:
// CHECK-NEXT: %omp_omp.loop.iv = phi i32 [ 0, %omp_omp.loop.preheader ], [ %omp_omp.loop.next, %omp_omp.loop.inc ]
// CHECK-NEXT: br label %omp_omp.loop.cond
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.cond:
// CHECK-NEXT: %omp_omp.loop.cmp = icmp ult i32 %omp_omp.loop.iv, %[[outer_tc]]
// CHECK-NEXT: br i1 %omp_omp.loop.cmp, label %omp_omp.loop.body, label %omp_omp.loop.exit
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.body:
// CHECK-NEXT: br label %omp.loop.region
// CHECK-EMPTY:
// CHECK-NEXT: omp.loop.region:
// CHECK-NEXT: br label %omp_omp.loop.preheader1
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.preheader1:
// CHECK-NEXT: br label %omp_omp.loop.header2
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.header2:
// CHECK-NEXT: %omp_omp.loop.iv8 = phi i32 [ 0, %omp_omp.loop.preheader1 ], [ %omp_omp.loop.next10, %omp_omp.loop.inc5 ]
// CHECK-NEXT: br label %omp_omp.loop.cond3
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.cond3:
// CHECK-NEXT: %omp_omp.loop.cmp9 = icmp ult i32 %omp_omp.loop.iv8, %[[inner_tc]]
// CHECK-NEXT: br i1 %omp_omp.loop.cmp9, label %omp_omp.loop.body4, label %omp_omp.loop.exit6
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.body4:
// CHECK-NEXT: br label %omp.loop.region12
// CHECK-EMPTY:
// CHECK-NEXT: omp.loop.region12:
// CHECK-NEXT: store float 4.200000e+01, ptr %[[ptr]], align 4
// CHECK-NEXT: br label %omp.region.cont11
// CHECK-EMPTY:
// CHECK-NEXT: omp.region.cont11:
// CHECK-NEXT: br label %omp_omp.loop.inc5
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.inc5:
// CHECK-NEXT: %omp_omp.loop.next10 = add nuw i32 %omp_omp.loop.iv8, 1
// CHECK-NEXT: br label %omp_omp.loop.header2
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.exit6:
// CHECK-NEXT: br label %omp_omp.loop.after7
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.after7:
// CHECK-NEXT: br label %omp.region.cont
// CHECK-EMPTY:
// CHECK-NEXT: omp.region.cont:
// CHECK-NEXT: br label %omp_omp.loop.inc
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.inc:
// CHECK-NEXT: %omp_omp.loop.next = add nuw i32 %omp_omp.loop.iv, 1
// CHECK-NEXT: br label %omp_omp.loop.header
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.exit:
// CHECK-NEXT: br label %omp_omp.loop.after
// CHECK-EMPTY:
// CHECK-NEXT: omp_omp.loop.after:
// CHECK-NEXT: ret void
// CHECK-NEXT: }
llvm.func @nested_loop(%ptr: !llvm.ptr, %outer_tc : i32, %inner_tc : i32) -> () {
%outer_cli = omp.new_cli
%inner_cli = omp.new_cli
omp.canonical_loop(%outer_cli) %outer_iv : i32 in range(%outer_tc) {
omp.canonical_loop(%inner_cli) %inner_iv : i32 in range(%inner_tc) {
%val = llvm.mlir.constant(42.0 : f32) : f32
llvm.store %val, %ptr : f32, !llvm.ptr
omp.terminator
}
omp.terminator
}
llvm.return
}
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