https://github.com/Meinersbur updated
https://github.com/llvm/llvm-project/pull/159773
>From b3919715ebe223b39dd789dcd471a864666d7008 Mon Sep 17 00:00:00 2001
From: Michael Kruse <llvm-proj...@meinersbur.de>
Date: Fri, 19 Sep 2025 14:43:48 +0200
Subject: [PATCH 1/2] Improve canonloop/iv naming
---
mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp | 237 +++++++++++++-----
.../Dialect/OpenMP/cli-canonical_loop.mlir | 127 ++++++++--
.../Dialect/OpenMP/cli-unroll-heuristic.mlir | 28 +--
3 files changed, 292 insertions(+), 100 deletions(-)
diff --git a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
index 3d70e28ed23ab..cf549a6bb50b4 100644
--- a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
+++ b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
@@ -77,6 +77,178 @@ struct LLVMPointerPointerLikeModel
};
} // namespace
+/// Generate a name of a canonical loop nest of the format
+/// `<prefix>(_s<num>_r<num>)*` that describes its nesting inside parent
+/// operations (`_r<num>`) and that operation's region (`_s<num>`). The region
+/// number is omitted if the parent operation has just one region. If a loop
+/// nest just consists of canonical loops nested inside each other, also uses
+/// `d<num>` where <num> is the nesting depth of the loop.
+static std::string generateLoopNestingName(StringRef prefix,
+ CanonicalLoopOp op) {
+ struct Component {
+ // An region argument of an operation
+ Operation *parentOp;
+ size_t regionInOpIdx;
+ bool isOnlyRegionInOp;
+ bool skipRegion;
+
+ // An operation somewhere in a parent region
+ Operation *thisOp;
+ Region *parentRegion;
+ size_t opInRegionIdx;
+ bool isOnlyOpInRegion;
+ bool skipOp;
+ int depth = -1;
+ };
+ SmallVector<Component> components;
+
+ // Gather a list of parent regions and operations, and the position within
+ // their parent
+ Operation *o = op.getOperation();
+ while (o) {
+ if (o->hasTrait<mlir::OpTrait::IsIsolatedFromAbove>())
+ break;
+
+ // Operation within a region
+ Region *r = o->getParentRegion();
+ if (!r)
+ break;
+
+ llvm::ReversePostOrderTraversal<Block *>
traversal(&r->getBlocks().front());
+ size_t idx = 0;
+ bool found = false;
+ size_t sequentialIdx = -1;
+ bool isOnlyLoop = true;
+ for (Block *b : traversal) {
+ for (Operation &op : *b) {
+ if (&op == o && !found) {
+ sequentialIdx = idx;
+ found = true;
+ }
+ if (op.getNumRegions()) {
+ idx += 1;
+ if (idx > 1)
+ isOnlyLoop = false;
+ }
+ if (found && !isOnlyLoop)
+ break;
+ }
+ }
+
+ Component &comp = components.emplace_back();
+ comp.thisOp = o;
+ comp.parentRegion = r;
+ comp.opInRegionIdx = sequentialIdx;
+ comp.isOnlyOpInRegion = isOnlyLoop;
+
+ // Region argument of an operation
+ Operation *parent = r->getParentOp();
+
+ comp.parentOp = parent;
+ comp.regionInOpIdx = 0;
+ comp.isOnlyRegionInOp = true;
+ if (parent && parent->getRegions().size() > 1) {
+ auto getRegionIndex = [](Operation *o, Region *r) {
+ for (auto [idx, region] : llvm::enumerate(o->getRegions())) {
+ if (®ion == r)
+ return idx;
+ }
+ llvm_unreachable("Region not child of its parent operation");
+ };
+ comp.regionInOpIdx = getRegionIndex(parent, r);
+ comp.isOnlyRegionInOp = false;
+ }
+
+ if (!parent)
+ break;
+
+ // next parent
+ o = parent;
+ }
+
+ // Reorder components from outermost to innermost
+ std::reverse(components.begin(), components.end());
+
+ // Determine whether a component is not needed
+ for (auto &c : components) {
+ c.skipRegion = c.isOnlyRegionInOp;
+ c.skipOp = c.isOnlyOpInRegion && !isa<CanonicalLoopOp>(c.thisOp);
+ }
+
+ // Find runs of perfect nests and merge them into a single component
+ int curNestRoot = 0;
+ int curNestDepth = 1;
+ auto mergeLoopNest = [&](int innermost) {
+ auto outermost = curNestRoot;
+
+ // Don't do enything if it does not consist of at least 2 loops
+ if (outermost < innermost) {
+ for (auto i : llvm::seq<int>(outermost + 1, innermost)) {
+ components[i].skipOp = true;
+ }
+ components[innermost].depth = curNestDepth;
+ }
+
+ // Start new root
+ curNestRoot = innermost + 1;
+ curNestDepth = 1;
+ };
+ for (auto &&[i, c] : llvm::enumerate(components)) {
+ if (i <= curNestRoot)
+ continue;
+
+ // Check whether this region can be included
+ if (!c.skipRegion) {
+ mergeLoopNest(i);
+ continue;
+ }
+
+ if (c.skipOp)
+ continue;
+
+ if (!c.isOnlyOpInRegion) {
+ mergeLoopNest(i);
+ continue;
+ }
+
+ curNestDepth += 1;
+ }
+
+ // Finalize innermost loop nest
+ mergeLoopNest(components.size() - 1);
+
+ // Outermost loop does not need a suffix if it has no sibling
+ for (auto &c : components) {
+ if (c.skipOp)
+ continue;
+ if (c.isOnlyOpInRegion)
+ c.skipOp = true;
+ break;
+ }
+
+ // Compile name
+ SmallString<64> Name{prefix};
+ for (auto &c : components) {
+ auto addComponent = [&Name](char letter, int64_t idx) {
+ Name += '_';
+ Name += letter;
+ Name += idx;
+ };
+
+ if (!c.skipRegion)
+ addComponent('r', c.regionInOpIdx);
+
+ if (!c.skipOp) {
+ if (c.depth >= 0)
+ addComponent('d', c.depth - 1);
+ else
+ addComponent('s', c.opInRegionIdx);
+ }
+ }
+
+ return Name.str().str();
+}
+
void OpenMPDialect::initialize() {
addOperations<
#define GET_OP_LIST
@@ -3141,67 +3313,7 @@ void NewCliOp::getAsmResultNames(OpAsmSetValueNameFn
setNameFn) {
cliName =
TypeSwitch<Operation *, std::string>(gen->getOwner())
.Case([&](CanonicalLoopOp op) {
- // Find the canonical loop nesting: For each ancestor add a
- // "+_r<idx>" suffix (in reverse order)
- SmallVector<std::string> components;
- Operation *o = op.getOperation();
- while (o) {
- if (o->hasTrait<mlir::OpTrait::IsIsolatedFromAbove>())
- break;
-
- Region *r = o->getParentRegion();
- if (!r)
- break;
-
- auto getSequentialIndex = [](Region *r, Operation *o) {
- llvm::ReversePostOrderTraversal<Block *> traversal(
- &r->getBlocks().front());
- size_t idx = 0;
- for (Block *b : traversal) {
- for (Operation &op : *b) {
- if (&op == o)
- return idx;
- // Only consider operations that are containers as
- // possible children
- if (!op.getRegions().empty())
- idx += 1;
- }
- }
- llvm_unreachable("Operation not part of the region");
- };
- size_t sequentialIdx = getSequentialIndex(r, o);
- components.push_back(("s" + Twine(sequentialIdx)).str());
-
- Operation *parent = r->getParentOp();
- if (!parent)
- break;
-
- // If the operation has more than one region, also count in
- // which of the regions
- if (parent->getRegions().size() > 1) {
- auto getRegionIndex = [](Operation *o, Region *r) {
- for (auto [idx, region] :
- llvm::enumerate(o->getRegions())) {
- if (®ion == r)
- return idx;
- }
- llvm_unreachable("Region not child its parent operation");
- };
- size_t regionIdx = getRegionIndex(parent, r);
- components.push_back(("r" + Twine(regionIdx)).str());
- }
-
- // next parent
- o = parent;
- }
-
- SmallString<64> Name("canonloop");
- for (const std::string &s : reverse(components)) {
- Name += '_';
- Name += s;
- }
-
- return Name;
+ return generateLoopNestingName("canonloop", op);
})
.Case([&](UnrollHeuristicOp op) -> std::string {
llvm_unreachable("heuristic unrolling does not generate a loop");
@@ -3292,7 +3404,8 @@ void
CanonicalLoopOp::getAsmBlockNames(OpAsmSetBlockNameFn setNameFn) {
void CanonicalLoopOp::getAsmBlockArgumentNames(Region ®ion,
OpAsmSetValueNameFn setNameFn) {
- setNameFn(region.getArgument(0), "iv");
+ std::string ivName = generateLoopNestingName("iv", *this);
+ setNameFn(region.getArgument(0), ivName);
}
void CanonicalLoopOp::print(OpAsmPrinter &p) {
diff --git a/mlir/test/Dialect/OpenMP/cli-canonical_loop.mlir
b/mlir/test/Dialect/OpenMP/cli-canonical_loop.mlir
index adadb8bbac49d..874e3922805ec 100644
--- a/mlir/test/Dialect/OpenMP/cli-canonical_loop.mlir
+++ b/mlir/test/Dialect/OpenMP/cli-canonical_loop.mlir
@@ -1,5 +1,5 @@
-// RUN: mlir-opt %s | FileCheck %s
-// RUN: mlir-opt %s | mlir-opt | FileCheck %s
+// RUN: mlir-opt %s | FileCheck %s --enable-var-scope
+// RUN: mlir-opt %s | mlir-opt | FileCheck %s --enable-var-scope
// CHECK-LABEL: @omp_canonloop_raw(
@@ -24,10 +24,10 @@ func.func @omp_canonloop_raw(%tc : i32) -> () {
func.func @omp_canonloop_sequential_raw(%tc : i32) -> () {
// CHECK-NEXT: %canonloop_s0 = omp.new_cli
%canonloop_s0 = "omp.new_cli" () : () -> (!omp.cli)
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv : i32 in
range(%[[tc]]) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv_s0 : i32 in
range(%[[tc]]) {
"omp.canonical_loop" (%tc, %canonloop_s0) ({
^bb_first(%iv_first: i32):
- // CHECK-NEXT: = llvm.add %iv, %iv : i32
+ // CHECK-NEXT: = llvm.add %iv_s0, %iv_s0 : i32
%newval = llvm.add %iv_first, %iv_first : i32
// CHECK-NEXT: omp.terminator
omp.terminator
@@ -36,7 +36,7 @@ func.func @omp_canonloop_sequential_raw(%tc : i32) -> () {
// CHECK-NEXT: %canonloop_s1 = omp.new_cli
%canonloop_s1 = "omp.new_cli" () : () -> (!omp.cli)
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s1) %iv : i32 in range(%[[tc]])
{
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s1) %iv_s1 : i32 in
range(%[[tc]]) {
"omp.canonical_loop" (%tc, %canonloop_s1) ({
^bb_second(%iv_second: i32):
// CHECK: omp.terminator
@@ -52,17 +52,17 @@ func.func @omp_canonloop_sequential_raw(%tc : i32) -> () {
// CHECK-LABEL: @omp_nested_canonloop_raw(
// CHECK-SAME: %[[tc_outer:.+]]: i32, %[[tc_inner:.+]]: i32)
func.func @omp_nested_canonloop_raw(%tc_outer : i32, %tc_inner : i32) -> () {
- // CHECK-NEXT: %canonloop_s0 = omp.new_cli
+ // CHECK-NEXT: %canonloop = omp.new_cli
%outer = "omp.new_cli" () : () -> (!omp.cli)
- // CHECK-NEXT: %canonloop_s0_s0 = omp.new_cli
+ // CHECK-NEXT: %canonloop_d1 = omp.new_cli
%inner = "omp.new_cli" () : () -> (!omp.cli)
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv : i32 in
range(%[[tc_outer]]) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop) %iv : i32 in
range(%[[tc_outer]]) {
"omp.canonical_loop" (%tc_outer, %outer) ({
^bb_outer(%iv_outer: i32):
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0_s0) %iv_0 : i32 in
range(%[[tc_inner]]) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_d1) %iv_d1 : i32 in
range(%[[tc_inner]]) {
"omp.canonical_loop" (%tc_inner, %inner) ({
^bb_inner(%iv_inner: i32):
- // CHECK-NEXT: = llvm.add %iv, %iv_0 : i32
+ // CHECK-NEXT: = llvm.add %iv, %iv_d1 : i32
%newval = llvm.add %iv_outer, %iv_inner: i32
// CHECK-NEXT: omp.terminator
omp.terminator
@@ -108,16 +108,24 @@ func.func @omp_canonloop_constant_pretty() -> () {
func.func @omp_canonloop_sequential_pretty(%tc : i32) -> () {
// CHECK-NEXT: %canonloop_s0 = omp.new_cli
%canonloop_s0 = omp.new_cli
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv : i32 in
range(%[[tc]]) {
- omp.canonical_loop(%canonloop_s0) %iv : i32 in range(%tc) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv_s0 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_s0) %iv_s0 : i32 in range(%tc) {
// CHECK-NEXT: omp.terminator
omp.terminator
}
// CHECK: %canonloop_s1 = omp.new_cli
%canonloop_s1 = omp.new_cli
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s1) %iv : i32 in
range(%[[tc]]) {
- omp.canonical_loop(%canonloop_s1) %iv_0 : i32 in range(%tc) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s1) %iv_s1 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_s1) %iv_s1 : i32 in range(%tc) {
+ // CHECK-NEXT: omp.terminator
+ omp.terminator
+ }
+
+ // CHECK: %canonloop_s2 = omp.new_cli
+ %canonloop_s2 = omp.new_cli
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s2) %iv_s2 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_s2) %iv_s2 : i32 in range(%tc) {
// CHECK-NEXT: omp.terminator
omp.terminator
}
@@ -126,17 +134,17 @@ func.func @omp_canonloop_sequential_pretty(%tc : i32) ->
() {
}
-// CHECK-LABEL: @omp_canonloop_nested_pretty(
+// CHECK-LABEL: @omp_canonloop_2d_nested_pretty(
// CHECK-SAME: %[[tc:.+]]: i32)
-func.func @omp_canonloop_nested_pretty(%tc : i32) -> () {
- // CHECK-NEXT: %canonloop_s0 = omp.new_cli
- %canonloop_s0 = omp.new_cli
- // CHECK-NEXT: %canonloop_s0_s0 = omp.new_cli
- %canonloop_s0_s0 = omp.new_cli
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv : i32 in
range(%[[tc]]) {
- omp.canonical_loop(%canonloop_s0) %iv : i32 in range(%tc) {
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0_s0) %iv_0 : i32 in
range(%[[tc]]) {
- omp.canonical_loop(%canonloop_s0_s0) %iv_0 : i32 in range(%tc) {
+func.func @omp_canonloop_2d_nested_pretty(%tc : i32) -> () {
+ // CHECK-NEXT: %canonloop = omp.new_cli
+ %canonloop = omp.new_cli
+ // CHECK-NEXT: %canonloop_d1 = omp.new_cli
+ %canonloop_d1 = omp.new_cli
+ // CHECK-NEXT: omp.canonical_loop(%canonloop) %iv : i32 in range(%[[tc]]) {
+ omp.canonical_loop(%canonloop) %iv : i32 in range(%tc) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_d1) %iv_d1 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_d1) %iv_d1 : i32 in range(%tc) {
// CHECK: omp.terminator
omp.terminator
}
@@ -147,6 +155,77 @@ func.func @omp_canonloop_nested_pretty(%tc : i32) -> () {
}
+// CHECK-LABEL: @omp_canonloop_3d_nested_pretty(
+// CHECK-SAME: %[[tc:.+]]: i32)
+func.func @omp_canonloop_3d_nested_pretty(%tc : i32) -> () {
+ // CHECK: %canonloop = omp.new_cli
+ %canonloop = omp.new_cli
+ // CHECK: %canonloop_d1 = omp.new_cli
+ %canonloop_d1 = omp.new_cli
+ // CHECK: %canonloop_d2 = omp.new_cli
+ %canonloop_d2 = omp.new_cli
+ // CHECK-NEXT: omp.canonical_loop(%canonloop) %iv : i32 in range(%[[tc]]) {
+ omp.canonical_loop(%canonloop) %iv : i32 in range(%tc) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_d1) %iv_d1 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_d1) %iv_1d : i32 in range(%tc) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_d2) %iv_d2 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_d2) %iv_d2 : i32 in range(%tc) {
+ // CHECK-NEXT: omp.terminator
+ omp.terminator
+ // CHECK-NEXT: }
+ }
+ // CHECK-NEXT: omp.terminator
+ omp.terminator
+ // CHECK-NEXT: }
+ }
+ // CHECK-NEXT: omp.terminator
+ omp.terminator
+ }
+
+ return
+}
+
+
+// CHECK-LABEL: @omp_canonloop_sequential_nested_pretty(
+// CHECK-SAME: %[[tc:.+]]: i32)
+func.func @omp_canonloop_sequential_nested_pretty(%tc : i32) -> () {
+ // CHECK-NEXT: %canonloop_s0 = omp.new_cli
+ %canonloop_s0 = omp.new_cli
+ // CHECK-NEXT: %canonloop_s0_d1 = omp.new_cli
+ %canonloop_s0_d1 = omp.new_cli
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv_s0 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_s0) %iv_s0 : i32 in range(%tc) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s0_d1) %iv_s0_d1 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_s0_d1) %iv_s0_d1 : i32 in range(%tc) {
+ // CHECK-NEXT: omp.terminator
+ omp.terminator
+ // CHECK-NEXT: }
+ }
+ // CHECK-NEXT: omp.terminator
+ omp.terminator
+ // CHECK-NEXT: }
+ }
+
+ // CHECK-NEXT: %canonloop_s1 = omp.new_cli
+ %canonloop_s1 = omp.new_cli
+ // CHECK-NEXT: %canonloop_s1_d1 = omp.new_cli
+ %canonloop_s1_d1 = omp.new_cli
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s1) %iv_s1 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_s1) %iv_s1 : i32 in range(%tc) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_s1_d1) %iv_s1_d1 : i32 in
range(%[[tc]]) {
+ omp.canonical_loop(%canonloop_s1_d1) %iv_s1d1 : i32 in range(%tc) {
+ // CHECK-NEXT: omp.terminator
+ omp.terminator
+ // CHECK-NEXT: }
+ }
+ // CHECK-NEXT: omp.terminator
+ omp.terminator
+ }
+
+ return
+}
+
+
// CHECK-LABEL: @omp_newcli_unused(
// CHECK-SAME: )
func.func @omp_newcli_unused() -> () {
diff --git a/mlir/test/Dialect/OpenMP/cli-unroll-heuristic.mlir
b/mlir/test/Dialect/OpenMP/cli-unroll-heuristic.mlir
index cda7d0b500166..16884f4245e76 100644
--- a/mlir/test/Dialect/OpenMP/cli-unroll-heuristic.mlir
+++ b/mlir/test/Dialect/OpenMP/cli-unroll-heuristic.mlir
@@ -1,18 +1,18 @@
-// RUN: mlir-opt %s | FileCheck %s
-// RUN: mlir-opt %s | mlir-opt | FileCheck %s
+// RUN: mlir-opt %s | FileCheck %s --enable-var-scope
+// RUN: mlir-opt %s | mlir-opt | FileCheck %s --enable-var-scope
// CHECK-LABEL: @omp_unroll_heuristic_raw(
// CHECK-SAME: %[[tc:.+]]: i32) {
func.func @omp_unroll_heuristic_raw(%tc : i32) -> () {
- // CHECK-NEXT: %canonloop_s0 = omp.new_cli
+ // CHECK-NEXT: %canonloop = omp.new_cli
%canonloop = "omp.new_cli" () : () -> (!omp.cli)
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv : i32 in range(%[[tc]])
{
+ // CHECK-NEXT: omp.canonical_loop(%canonloop) %iv : i32 in range(%[[tc]]) {
"omp.canonical_loop" (%tc, %canonloop) ({
^bb0(%iv: i32):
omp.terminator
}) : (i32, !omp.cli) -> ()
- // CHECK: omp.unroll_heuristic(%canonloop_s0)
+ // CHECK: omp.unroll_heuristic(%canonloop)
"omp.unroll_heuristic" (%canonloop) : (!omp.cli) -> ()
return
}
@@ -22,12 +22,12 @@ func.func @omp_unroll_heuristic_raw(%tc : i32) -> () {
// CHECK-SAME: %[[tc:.+]]: i32) {
func.func @omp_unroll_heuristic_pretty(%tc : i32) -> () {
// CHECK-NEXT: %[[CANONLOOP:.+]] = omp.new_cli
- %canonloop = "omp.new_cli" () : () -> (!omp.cli)
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv : i32 in
range(%[[tc]]) {
+ %canonloop = omp.new_cli
+ // CHECK-NEXT: omp.canonical_loop(%canonloop) %iv : i32 in range(%[[tc]]) {
omp.canonical_loop(%canonloop) %iv : i32 in range(%tc) {
omp.terminator
}
- // CHECK: omp.unroll_heuristic(%canonloop_s0)
+ // CHECK: omp.unroll_heuristic(%canonloop)
omp.unroll_heuristic(%canonloop)
return
}
@@ -36,13 +36,13 @@ func.func @omp_unroll_heuristic_pretty(%tc : i32) -> () {
// CHECK-LABEL: @omp_unroll_heuristic_nested_pretty(
// CHECK-SAME: %[[tc:.+]]: i32) {
func.func @omp_unroll_heuristic_nested_pretty(%tc : i32) -> () {
- // CHECK-NEXT: %canonloop_s0 = omp.new_cli
+ // CHECK-NEXT: %canonloop = omp.new_cli
%cli_outer = omp.new_cli
- // CHECK-NEXT: %canonloop_s0_s0 = omp.new_cli
+ // CHECK-NEXT: %canonloop_d1 = omp.new_cli
%cli_inner = omp.new_cli
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0) %iv : i32 in range(%[[tc]])
{
+ // CHECK-NEXT: omp.canonical_loop(%canonloop) %iv : i32 in range(%[[tc]]) {
omp.canonical_loop(%cli_outer) %iv_outer : i32 in range(%tc) {
- // CHECK-NEXT: omp.canonical_loop(%canonloop_s0_s0) %iv_0 : i32 in
range(%[[tc]]) {
+ // CHECK-NEXT: omp.canonical_loop(%canonloop_d1) %iv_d1 : i32 in
range(%[[tc]]) {
omp.canonical_loop(%cli_inner) %iv_inner : i32 in range(%tc) {
// CHECK: omp.terminator
omp.terminator
@@ -51,9 +51,9 @@ func.func @omp_unroll_heuristic_nested_pretty(%tc : i32) ->
() {
omp.terminator
}
- // CHECK: omp.unroll_heuristic(%canonloop_s0)
+ // CHECK: omp.unroll_heuristic(%canonloop)
omp.unroll_heuristic(%cli_outer)
- // CHECK-NEXT: omp.unroll_heuristic(%canonloop_s0_s0)
+ // CHECK-NEXT: omp.unroll_heuristic(%canonloop_d1)
omp.unroll_heuristic(%cli_inner)
return
}
>From ce66eec648f6415c199d6115f3be4d188eee59ba Mon Sep 17 00:00:00 2001
From: Michael Kruse <llvm-proj...@meinersbur.de>
Date: Tue, 23 Sep 2025 12:19:41 +0200
Subject: [PATCH 2/2] Avoid compiler warning
---
mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
index cf549a6bb50b4..1674891410194 100644
--- a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
+++ b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
@@ -170,22 +170,21 @@ static std::string generateLoopNestingName(StringRef
prefix,
std::reverse(components.begin(), components.end());
// Determine whether a component is not needed
- for (auto &c : components) {
+ for (Component &c : components) {
c.skipRegion = c.isOnlyRegionInOp;
c.skipOp = c.isOnlyOpInRegion && !isa<CanonicalLoopOp>(c.thisOp);
}
// Find runs of perfect nests and merge them into a single component
- int curNestRoot = 0;
- int curNestDepth = 1;
- auto mergeLoopNest = [&](int innermost) {
- auto outermost = curNestRoot;
+ size_t curNestRoot = 0;
+ size_t curNestDepth = 1;
+ auto mergeLoopNest = [&](size_t innermost) {
+ size_t outermost = curNestRoot;
// Don't do enything if it does not consist of at least 2 loops
if (outermost < innermost) {
- for (auto i : llvm::seq<int>(outermost + 1, innermost)) {
+ for (auto i : llvm::seq<int>(outermost + 1, innermost))
components[i].skipOp = true;
- }
components[innermost].depth = curNestDepth;
}
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