ldc-developers · kinke · Oct 2, 2025 · Oct 2, 2025 · Oct 4, 2025 · Nov 9, 2025
diff --git a/.github/actions/1-setup/action.yml b/.github/actions/1-setup/action.yml
@@ -37,30 +37,30 @@ runs:
         # Make sure to link libzstd statically
         sudo rm /usr/lib/$arch-linux-gnu/libzstd.so
 
-    - name: 'Linux: Install clang 20 from apt.llvm.org'
+    - name: 'Linux: Install clang 21 from apt.llvm.org'
       if: runner.os == 'Linux'
       shell: bash
       run: |
         set -eux
         cd ..
         curl -fL --retry 3 --max-time 30 -O https://apt.llvm.org/llvm.sh
-        sudo bash llvm.sh 20
+        sudo bash llvm.sh 21
         for tool in clang clang++ ld.lld; do
-          sudo ln -sf $tool-20 /usr/bin/$tool
+          sudo ln -sf $tool-21 /usr/bin/$tool
           $tool --version
         done
-    - name: 'macOS arm64: Install Homebrew clang 20' # see mimalloc comment in ../3-build-native/action.yml
+    - name: 'macOS arm64: Install Homebrew clang 21' # see mimalloc comment in ../3-build-native/action.yml
       if: runner.os == 'macOS' && inputs.arch == 'arm64'
       shell: bash
-      run: brew install llvm@20
-    - name: 'Windows: Install clang v20.1.3 from GitHub'
+      run: brew install llvm@21
+    - name: 'Windows: Install clang v21.1.5 from GitHub'
       if: runner.os == 'Windows'
       shell: bash
       run: |
         set -eux
         cd ..
         curl -fL --retry 3 --max-time 300 -o clang.exe \
-          https://github.com/llvm/llvm-project/releases/download/llvmorg-20.1.3/LLVM-20.1.3-win64.exe
+          https://github.com/llvm/llvm-project/releases/download/llvmorg-21.1.5/LLVM-21.1.5-win64.exe
         ./clang.exe //S # double-slash for bash
         rm clang.exe
         # C:\Program Files\LLVM\bin should already be in PATH

diff --git a/.github/actions/3-build-cross/android-llvm-config.in b/.github/actions/3-build-cross/android-llvm-config.in
@@ -50,33 +50,8 @@ if [ "$has_rtti" != "YES" ]; then CXXFLAGS="$CXXFLAGS -fno-rtti"; fi
 LDFLAGS="-L${prefix}/lib"
 LIBFILE="${prefix}/lib/libLLVM-$version.so"
 
-components="aarch64 aarch64asmparser aarch64codegen aarch64desc aarch64disassembler aarch64info aarch64utils \
-aggressiveinstcombine all all-targets analysis arm armasmparser armcodegen armdesc armdisassembler arminfo armutils \
-asmparser asmprinter binaryformat bitreader bitstreamreader bitwriter cfguard cgdata codegen codegentypes core coroutines coverage \
-debuginfobtf debuginfocodeview debuginfodwarf debuginfogsym debuginfologicalview debuginfomsf debuginfopdb demangle dlltooldriver dwarflinker dwarflinkerclassic dwarflinkerparallel dwp \
-engine executionengine extensions filecheck frontendatomic frontenddriver frontendhlsl frontendoffloading frontendopenacc frontendopenmp fuzzercli fuzzmutate globalisel hipstdpar instcombine \
-instrumentation interfacestub interpreter ipo irprinter irreader jitlink libdriver lineeditor linker lto mc mca mcdisassembler \
-mcjit mcparser mirparser native nativecodegen objcarcopts objcopy object objectyaml option orcdebugging orcjit orcshared orctargetprocess \
-passes profiledata remarks runtimedyld sandboxir scalaropts selectiondag spirv spirvanalysis spirvcodegen spirvdesc spirvinfo support symbolize tablegen target targetparser telemetry textapi \
-textapibinaryreader transformutils vectorize webassembly webassemblyasmparser webassemblycodegen webassemblydesc webassemblydisassembler \
-webassemblyinfo webassemblyutils windowsdriver windowsmanifest x86 x86asmparser x86codegen x86desc x86disassembler x86info \
-x86targetmca xray"
-static_libs="-lLLVMWindowsManifest -lLLVMXRay -lLLVMLibDriver -lLLVMDlltoolDriver -lLLVMTelemetry -lLLVMTextAPIBinaryReader -lLLVMCoverage -lLLVMLineEditor \
--lLLVMX86TargetMCA -lLLVMX86Disassembler -lLLVMX86AsmParser -lLLVMX86CodeGen -lLLVMX86Desc -lLLVMX86Info \
--lLLVMSPIRVCodeGen -lLLVMSPIRVDesc -lLLVMSPIRVInfo -lLLVMSPIRVAnalysis -lLLVMWebAssemblyDisassembler \
--lLLVMWebAssemblyAsmParser -lLLVMWebAssemblyCodeGen -lLLVMWebAssemblyUtils -lLLVMWebAssemblyDesc -lLLVMWebAssemblyInfo -lLLVMARMDisassembler \
--lLLVMARMAsmParser -lLLVMARMCodeGen -lLLVMARMDesc -lLLVMARMUtils -lLLVMARMInfo -lLLVMAArch64Disassembler \
--lLLVMAArch64AsmParser -lLLVMAArch64CodeGen -lLLVMAArch64Desc -lLLVMAArch64Utils -lLLVMAArch64Info -lLLVMOrcDebugging -lLLVMOrcJIT \
--lLLVMWindowsDriver -lLLVMMCJIT -lLLVMJITLink -lLLVMInterpreter -lLLVMExecutionEngine -lLLVMRuntimeDyld -lLLVMOrcTargetProcess -lLLVMOrcShared \
--lLLVMDWP -lLLVMDebugInfoLogicalView -lLLVMDebugInfoGSYM -lLLVMOption -lLLVMObjectYAML -lLLVMObjCopy -lLLVMMCA \
--lLLVMMCDisassembler -lLLVMLTO -lLLVMPasses -lLLVMHipStdPar -lLLVMCFGuard -lLLVMCoroutines -lLLVMipo \
--lLLVMVectorize -lLLVMSandboxIR -lLLVMLinker -lLLVMInstrumentation -lLLVMFrontendOpenMP -lLLVMFrontendOffloading -lLLVMFrontendOpenACC -lLLVMFrontendHLSL -lLLVMFrontendDriver -lLLVMFrontendAtomic -lLLVMExtensions \
--lLLVMDWARFLinkerParallel -lLLVMDWARFLinkerClassic -lLLVMDWARFLinker -lLLVMGlobalISel -lLLVMMIRParser -lLLVMAsmPrinter -lLLVMSelectionDAG \
--lLLVMCodeGen -lLLVMTarget -lLLVMObjCARCOpts -lLLVMCodeGenTypes -lLLVMCGData -lLLVMIRPrinter -lLLVMInterfaceStub -lLLVMFileCheck -lLLVMFuzzMutate \
--lLLVMScalarOpts -lLLVMInstCombine -lLLVMAggressiveInstCombine -lLLVMTransformUtils -lLLVMBitWriter -lLLVMAnalysis \
--lLLVMProfileData -lLLVMSymbolize -lLLVMDebugInfoBTF -lLLVMDebugInfoPDB -lLLVMDebugInfoMSF -lLLVMDebugInfoCodeView -lLLVMDebugInfoDWARF -lLLVMObject -lLLVMTextAPI -lLLVMMCParser -lLLVMIRReader -lLLVMAsmParser -lLLVMMC \
--lLLVMBitReader -lLLVMFuzzerCLI -lLLVMCore -lLLVMRemarks -lLLVMBitstreamReader -lLLVMBinaryFormat -lLLVMTargetParser -lLLVMTableGen -lLLVMSupport \
--lLLVMDemangle"
+components="aarch64 aarch64asmparser aarch64codegen aarch64desc aarch64disassembler aarch64info aarch64utils aggressiveinstcombine all all-targets analysis arm armasmparser armcodegen armdesc armdisassembler arminfo armutils asmparser asmprinter binaryformat bitreader bitstreamreader bitwriter cfguard cgdata codegen codegentypes core coroutines coverage debuginfobtf debuginfocodeview debuginfodwarf debuginfodwarflowlevel debuginfogsym debuginfologicalview debuginfomsf debuginfopdb demangle dlltooldriver dwarfcfichecker dwarflinker dwarflinkerclassic dwarflinkerparallel dwp engine executionengine extensions filecheck frontendatomic frontenddirective frontenddriver frontendhlsl frontendoffloading frontendopenacc frontendopenmp fuzzercli fuzzmutate globalisel hipstdpar instcombine instrumentation interfacestub interpreter ipo irprinter irreader jitlink libdriver lineeditor linker lto mc mca mcdisassembler mcjit mcparser mirparser native nativecodegen objcarcopts objcopy object objectyaml option orcdebugging orcjit orcshared orctargetprocess passes profiledata remarks runtimedyld sandboxir scalaropts selectiondag spirv spirvanalysis spirvcodegen spirvdesc spirvinfo support symbolize tablegen target targetparser telemetry textapi textapibinaryreader transformutils vectorize webassembly webassemblyasmparser webassemblycodegen webassemblydesc webassemblydisassembler webassemblyinfo webassemblyutils windowsdriver windowsmanifest x86 x86asmparser x86codegen x86desc x86disassembler x86info x86targetmca xray"
+static_libs="-lLLVMWindowsManifest -lLLVMXRay -lLLVMLibDriver -lLLVMDlltoolDriver -lLLVMTelemetry -lLLVMTextAPIBinaryReader -lLLVMCoverage -lLLVMLineEditor -lLLVMX86TargetMCA -lLLVMX86Disassembler -lLLVMX86AsmParser -lLLVMX86CodeGen -lLLVMX86Desc -lLLVMX86Info -lLLVMWebAssemblyDisassembler -lLLVMWebAssemblyAsmParser -lLLVMWebAssemblyCodeGen -lLLVMWebAssemblyUtils -lLLVMWebAssemblyDesc -lLLVMWebAssemblyInfo -lLLVMSPIRVCodeGen -lLLVMSPIRVDesc -lLLVMSPIRVInfo -lLLVMSPIRVAnalysis -lLLVMARMDisassembler -lLLVMARMAsmParser -lLLVMARMCodeGen -lLLVMARMDesc -lLLVMARMUtils -lLLVMARMInfo -lLLVMAArch64Disassembler -lLLVMAArch64AsmParser -lLLVMAArch64CodeGen -lLLVMAArch64Desc -lLLVMAArch64Utils -lLLVMAArch64Info -lLLVMOrcDebugging -lLLVMOrcJIT -lLLVMWindowsDriver -lLLVMMCJIT -lLLVMJITLink -lLLVMInterpreter -lLLVMExecutionEngine -lLLVMRuntimeDyld -lLLVMOrcTargetProcess -lLLVMOrcShared -lLLVMDWP -lLLVMDWARFCFIChecker -lLLVMDebugInfoLogicalView -lLLVMOption -lLLVMObjCopy -lLLVMMCA -lLLVMMCDisassembler -lLLVMLTO -lLLVMPasses -lLLVMHipStdPar -lLLVMCFGuard -lLLVMCoroutines -lLLVMipo -lLLVMVectorize -lLLVMSandboxIR -lLLVMLinker -lLLVMFrontendOpenMP -lLLVMFrontendOffloading -lLLVMObjectYAML -lLLVMFrontendOpenACC -lLLVMFrontendHLSL -lLLVMFrontendDriver -lLLVMInstrumentation -lLLVMFrontendDirective -lLLVMFrontendAtomic -lLLVMExtensions -lLLVMDWARFLinkerParallel -lLLVMDWARFLinkerClassic -lLLVMDWARFLinker -lLLVMGlobalISel -lLLVMMIRParser -lLLVMAsmPrinter -lLLVMSelectionDAG -lLLVMCodeGen -lLLVMTarget -lLLVMObjCARCOpts -lLLVMCodeGenTypes -lLLVMCGData -lLLVMIRPrinter -lLLVMInterfaceStub -lLLVMFileCheck -lLLVMFuzzMutate -lLLVMScalarOpts -lLLVMInstCombine -lLLVMAggressiveInstCombine -lLLVMTransformUtils -lLLVMBitWriter -lLLVMAnalysis -lLLVMProfileData -lLLVMSymbolize -lLLVMDebugInfoBTF -lLLVMDebugInfoPDB -lLLVMDebugInfoMSF -lLLVMDebugInfoCodeView -lLLVMDebugInfoGSYM -lLLVMDebugInfoDWARF -lLLVMDebugInfoDWARFLowLevel -lLLVMObject -lLLVMTextAPI -lLLVMMCParser -lLLVMIRReader -lLLVMAsmParser -lLLVMMC -lLLVMBitReader -lLLVMFuzzerCLI -lLLVMCore -lLLVMRemarks -lLLVMBitstreamReader -lLLVMBinaryFormat -lLLVMTargetParser -lLLVMTableGen -lLLVMSupport -lLLVMDemangle"
 shared_libs="-lLLVM-$version"
 libs=$static_libs
 handle_args () {

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -14,7 +14,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  LLVM_VERSION: 20.1.5
+  LLVM_VERSION: c922a5f9
 
 jobs:
   build-native:
@@ -85,8 +85,8 @@ jobs:
             os: macos-15
             arch: arm64
             extra_cmake_flags: >-
-              -DCMAKE_C_COMPILER=/opt/homebrew/opt/llvm@20/bin/clang
-              -DCMAKE_CXX_COMPILER=/opt/homebrew/opt/llvm@20/bin/clang++
+              -DCMAKE_C_COMPILER=/opt/homebrew/opt/llvm@21/bin/clang
+              -DCMAKE_CXX_COMPILER=/opt/homebrew/opt/llvm@21/bin/clang++
               -DD_COMPILER_FLAGS="-O -flto=full -defaultlib=phobos2-ldc-lto,druntime-ldc-lto -L-exported_symbol '-L__*' -L-w"
               -DEXTRA_CXXFLAGS=-flto=full
             with_pgo: true

diff --git a/gen/passes/GarbageCollect2Stack.cpp b/gen/passes/GarbageCollect2Stack.cpp
@@ -746,18 +746,16 @@ bool isSafeToStackAllocate(BasicBlock::iterator Alloc, Value *V,
       for (auto A = B; A != E; ++A) {
         if (A->get() == V) {
 #if LDC_LLVM_VER >= 2100
-          if (CB->paramHasAttr(A - B, llvm::Attribute::AttrKind::Captures)) {
-            return capturesNothing(
-                        CB->getParamAttr(A - B, llvm::Attribute::AttrKind::Captures)
-                           .getCaptureInfo());
-          }
-
+          if (!(CB->paramHasAttr(A - B, llvm::Attribute::AttrKind::Captures) &&
+                capturesNothing(
+                    CB->getParamAttr(A - B, llvm::Attribute::AttrKind::Captures)
+                        .getCaptureInfo()))) {
 #else
           if (!CB->paramHasAttr(A - B, llvm::Attribute::AttrKind::NoCapture)) {
+#endif
             // The parameter is not marked 'nocapture' - captured.
             return false;
           }
-#endif
 
           if (auto call = dyn_cast<CallInst>(static_cast<Instruction *>(CB))) {
             if (call->isTailCall()) {

diff --git a/runtime/druntime/src/ldc/intrinsics.di b/runtime/druntime/src/ldc/intrinsics.di
@@ -26,7 +26,7 @@ else version (LDC_LLVM_1800) enum LLVM_version = 1800;
 else version (LDC_LLVM_1801) enum LLVM_version = 1801;
 else version (LDC_LLVM_1901) enum LLVM_version = 1901;
 else version (LDC_LLVM_2001) enum LLVM_version = 2001;
-else version (LDC_LLVM_2100) enum LLVM_version = 2100;
+else version (LDC_LLVM_2101) enum LLVM_version = 2101;
 else static assert(false, "LDC LLVM version not supported");
 
 enum LLVM_atleast(int major) = (LLVM_version >= major * 100);

diff --git a/tests/codegen/align.d b/tests/codegen/align.d
@@ -21,12 +21,12 @@ Outer passAndReturnOuterByVal(Outer arg) { return arg; }
 // CHECK-SAME: ptr {{noalias sret.*|inreg noalias}} align 32 %.sret_arg
 /* How the arg is passed by value is ABI-specific, but the pointer must be aligned.
  * When the argument is passed as a byte array and copied into a stack alloc, that stack alloca must be aligned. */
-// CHECK: {{(align 32 %arg|%arg = alloca %align.Outer, align 32)}}
+// CHECK: {{(align 32 %arg|%arg = alloca %align.Outer, align 32|call void @llvm.memcpy.* %.sret_arg,.* %arg)}}
 
 Inner passAndReturnInnerByVal(Inner arg) { return arg; }
 // CHECK: define{{.*}} void @{{.*}}_D5align23passAndReturnInnerByValFSQBh5InnerZQl
 // CHECK-SAME: ptr {{noalias sret.*|inreg noalias}} align 32 %.sret_arg
-// CHECK: {{(align 32 %arg|%arg = alloca %align.Inner, align 32)}}
+// CHECK: {{(align 32 %arg|%arg = alloca %align.Inner, align 32|call void @llvm.memcpy.* %.sret_arg,.* %arg)}}
 
 void main() {
   Outer outer;
@@ -61,11 +61,11 @@ void main() {
   // CHECK: call{{.*}} void @{{.*}}_D5align23passAndReturnOuterByValFSQBh5OuterZQl
   // CHECK-SAME: ptr {{noalias sret.*|inreg noalias}} align 32 %.sret_tmp
   // The argument is either passed by aligned (optimizer hint) pointer or as an array of i32/64 and copied into an aligned stack slot inside the callee.
-  // CHECK-SAME: {{(align 32 %|\[[0-9]+ x i..\])}}
+  // CHECK-SAME: {{(align 32 |\[[0-9]+ x i..\])}}
 
   inner = passAndReturnInnerByVal(inner);
   // CHECK: call{{.*}} void @{{.*}}_D5align23passAndReturnInnerByValFSQBh5InnerZQl
   // CHECK-SAME: ptr {{noalias sret.*|inreg noalias}} align 32 %.sret_tmp
   // The argument is either passed by aligned (optimizer hint) pointer or as an array of i32/64 and copied into an aligned stack slot inside the callee.
-  // CHECK-SAME: {{(align 32 %|\[[0-9]+ x i..\])}}
+  // CHECK-SAME: {{(align 32 |\[[0-9]+ x i..\])}}
 }
diff --git a/tests/codegen/dmd_style_asm_with_variable_and_offset_memory_reference.d b/tests/codegen/dmd_style_asm_with_variable_and_offset_memory_reference.d
@@ -26,7 +26,7 @@ uint getHighHalfOfGlobal(ulong value)
 {
     asm
     {
-        // CHECK: movl    ((4+(-8))+_someGlobalVariable)+8, %eax
+        // CHECK: movl    {{\(?\(?4\+\(?-8\)?\)?\+_someGlobalVariable\)?\+8}}, %eax
         mov EAX, dword ptr [someGlobalVariable + 4];
     }
 }
-Original file line number
+Diff line change
@@ Expand Up / @@ -26,7 +26,7 @@ uint getHighHalfOfGlobal(ulong value) @@
     {
         asm
         {
-            // CHECK: movl    ((4+(-8))+_someGlobalVariable)+8, %eax
+            // CHECK: movl    {{\(?\(?4\+\(?-8\)?\)?\+_someGlobalVariable\)?\+8}}, %eax
             mov EAX, dword ptr [someGlobalVariable + 4];
         }
     }
@@ Expand Down @@