Author: Nikita Popov Date: 2025-10-01T14:31:21Z New Revision: 31e4363ba9c2e0582a2b1105fe24dbfff860b7f6
URL: https://github.com/llvm/llvm-project/commit/31e4363ba9c2e0582a2b1105fe24dbfff860b7f6 DIFF: https://github.com/llvm/llvm-project/commit/31e4363ba9c2e0582a2b1105fe24dbfff860b7f6.diff LOG: [NVPTX] Disable relative lookup tables (#159748) Relative lookup tables result in "LLVM ERROR: Circular dependency found in global variable set", so disable them for this target. (cherry picked from commit 1ed15374638ecf6046169194b4b3ca34b7cf340f) Added: llvm/test/Transforms/RelLookupTableConverter/nvptx.ll Modified: llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.h Removed: ################################################################################ diff --git a/llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.h b/llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.h index 9a6e261c811a0..437edfb8ffc75 100644 --- a/llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.h +++ b/llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.h @@ -183,6 +183,11 @@ class NVPTXTTIImpl final : public BasicTTIImplBase<NVPTXTTIImpl> { void collectKernelLaunchBounds( const Function &F, SmallVectorImpl<std::pair<StringRef, int64_t>> &LB) const override; + + bool shouldBuildRelLookupTables() const override { + // Self-referential globals are not supported. + return false; + } }; } // end namespace llvm diff --git a/llvm/test/Transforms/RelLookupTableConverter/nvptx.ll b/llvm/test/Transforms/RelLookupTableConverter/nvptx.ll new file mode 100644 index 0000000000000..70ebf220c369c --- /dev/null +++ b/llvm/test/Transforms/RelLookupTableConverter/nvptx.ll @@ -0,0 +1,32 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals all --version 5 +; RUN: opt < %s -passes=rel-lookup-table-converter -relocation-model=pic -S | FileCheck %s +; REQUIRES: nvptx-registered-target +target triple = "nvptx64-nvidia-cuda" + +; Do not produce relative lookup table for nvptx target. + +@a1 = internal constant i32 0, align 4 +@b1 = internal constant i32 0, align 4 +@c1 = internal constant i32 0, align 4 +@d1 = internal constant i32 0, align 4 + +@switch.table = private unnamed_addr constant [3 x ptr] [ptr @a1, ptr @b1, ptr @c1], align 8 + +;. +; CHECK: @a1 = internal constant i32 0, align 4 +; CHECK: @b1 = internal constant i32 0, align 4 +; CHECK: @c1 = internal constant i32 0, align 4 +; CHECK: @d1 = internal constant i32 0, align 4 +; CHECK: @switch.table = private unnamed_addr constant [3 x ptr] [ptr @a1, ptr @b1, ptr @c1], align 8 +;. +define ptr @internal_linkage(i32 %cond) { +; CHECK-LABEL: define ptr @internal_linkage( +; CHECK-SAME: i32 [[COND:%.*]]) { +; CHECK-NEXT: [[SWITCH_GEP:%.*]] = getelementptr inbounds [3 x ptr], ptr @switch.table, i32 0, i32 [[COND]] +; CHECK-NEXT: [[RELTABLE_INTRINSIC:%.*]] = load ptr, ptr [[SWITCH_GEP]], align 8 +; CHECK-NEXT: ret ptr [[RELTABLE_INTRINSIC]] +; + %switch.gep = getelementptr inbounds [3 x ptr], ptr @switch.table, i32 0, i32 %cond + %switch.load = load ptr, ptr %switch.gep, align 8 + ret ptr %switch.load +} _______________________________________________ llvm-branch-commits mailing list llvm-branch-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits
