llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-flang-fir-hlfir Author: Kiran Chandramohan (kiranchandramohan) <details> <summary>Changes</summary> Reverts llvm/llvm-project#<!-- -->123330 --- Full diff: https://github.com/llvm/llvm-project/pull/123606.diff 9 Files Affected: - (modified) clang/include/clang/Driver/Options.td (+5) - (modified) clang/lib/Driver/ToolChains/Flang.cpp (+4-2) - (modified) flang/include/flang/Lower/LoweringOptions.def (+3) - (modified) flang/lib/Frontend/CompilerInvocation.cpp (+8) - (modified) flang/lib/Lower/ConvertVariable.cpp (+5-1) - (added) flang/test/Driver/fno-zero-init.f90 (+9) - (added) flang/test/Lower/zero_init.f90 (+20) - (added) flang/test/Lower/zero_init_default_init.f90 (+22) - (modified) flang/tools/bbc/bbc.cpp (+6) ``````````diff diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td index d38dd2b4e3cf09..c4b9743597bb2e 100644 --- a/clang/include/clang/Driver/Options.td +++ b/clang/include/clang/Driver/Options.td @@ -3505,6 +3505,11 @@ def fno_struct_path_tbaa : Flag<["-"], "fno-struct-path-tbaa">, Group<f_Group>; def fno_strict_enums : Flag<["-"], "fno-strict-enums">, Group<f_Group>; def fno_strict_overflow : Flag<["-"], "fno-strict-overflow">, Group<f_Group>, Visibility<[ClangOption, FlangOption]>; +defm init_global_zero : BoolOptionWithoutMarshalling<"f", "init-global-zero", + PosFlag<SetTrue, [], [FlangOption, FC1Option], + "Zero initialize globals without default initialization (default)">, + NegFlag<SetFalse, [], [FlangOption, FC1Option], + "Do not zero initialize globals without default initialization">>; def fno_pointer_tbaa : Flag<["-"], "fno-pointer-tbaa">, Group<f_Group>; def fno_temp_file : Flag<["-"], "fno-temp-file">, Group<f_Group>, Visibility<[ClangOption, CC1Option, CLOption, DXCOption]>, HelpText< diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp index 86ed25badfa2b7..9c1fd28a3a8a26 100644 --- a/clang/lib/Driver/ToolChains/Flang.cpp +++ b/clang/lib/Driver/ToolChains/Flang.cpp @@ -155,8 +155,10 @@ void Flang::addCodegenOptions(const ArgList &Args, options::OPT_flang_deprecated_no_hlfir, options::OPT_fno_ppc_native_vec_elem_order, options::OPT_fppc_native_vec_elem_order, - options::OPT_ftime_report, options::OPT_ftime_report_EQ, - options::OPT_funroll_loops, options::OPT_fno_unroll_loops}); + options::OPT_finit_global_zero, + options::OPT_fno_init_global_zero, options::OPT_ftime_report, + options::OPT_ftime_report_EQ, options::OPT_funroll_loops, + options::OPT_fno_unroll_loops}); } void Flang::addPicOptions(const ArgList &Args, ArgStringList &CmdArgs) const { diff --git a/flang/include/flang/Lower/LoweringOptions.def b/flang/include/flang/Lower/LoweringOptions.def index 5a6debfdffe030..396c91948be36b 100644 --- a/flang/include/flang/Lower/LoweringOptions.def +++ b/flang/include/flang/Lower/LoweringOptions.def @@ -44,5 +44,8 @@ ENUM_LOWERINGOPT(IntegerWrapAround, unsigned, 1, 0) /// If false, assume that the shapes/types/allocation-status match. ENUM_LOWERINGOPT(ReallocateLHS, unsigned, 1, 1) +/// If true, initialize globals without initialization to zero. +/// On by default. +ENUM_LOWERINGOPT(InitGlobalZero, unsigned, 1, 1) #undef LOWERINGOPT #undef ENUM_LOWERINGOPT diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp index 15b1e1e0a24881..3c6da4687f65d3 100644 --- a/flang/lib/Frontend/CompilerInvocation.cpp +++ b/flang/lib/Frontend/CompilerInvocation.cpp @@ -1377,6 +1377,14 @@ bool CompilerInvocation::createFromArgs( invoc.loweringOpts.setNoPPCNativeVecElemOrder(true); } + // -f[no-]init-global-zero + if (args.hasFlag(clang::driver::options::OPT_finit_global_zero, + clang::driver::options::OPT_fno_init_global_zero, + /*default=*/true)) + invoc.loweringOpts.setInitGlobalZero(true); + else + invoc.loweringOpts.setInitGlobalZero(false); + // Preserve all the remark options requested, i.e. -Rpass, -Rpass-missed or // -Rpass-analysis. This will be used later when processing and outputting the // remarks generated by LLVM in ExecuteCompilerInvocation.cpp. diff --git a/flang/lib/Lower/ConvertVariable.cpp b/flang/lib/Lower/ConvertVariable.cpp index 9ee42d5cd88002..87236dc293ebbc 100644 --- a/flang/lib/Lower/ConvertVariable.cpp +++ b/flang/lib/Lower/ConvertVariable.cpp @@ -635,7 +635,11 @@ static fir::GlobalOp defineGlobal(Fortran::lower::AbstractConverter &converter, global.setLinkName(builder.createCommonLinkage()); Fortran::lower::createGlobalInitialization( builder, global, [&](fir::FirOpBuilder &builder) { - mlir::Value initValue = builder.create<fir::ZeroOp>(loc, symTy); + mlir::Value initValue; + if (converter.getLoweringOptions().getInitGlobalZero()) + initValue = builder.create<fir::ZeroOp>(loc, symTy); + else + initValue = builder.create<fir::UndefOp>(loc, symTy); builder.create<fir::HasValueOp>(loc, initValue); }); } diff --git a/flang/test/Driver/fno-zero-init.f90 b/flang/test/Driver/fno-zero-init.f90 new file mode 100644 index 00000000000000..2ffa10dd040d52 --- /dev/null +++ b/flang/test/Driver/fno-zero-init.f90 @@ -0,0 +1,9 @@ +! Check that the driver passes through -f[no-]init-global-zero: +! RUN: %flang -### -S -finit-global-zero %s -o - 2>&1 | FileCheck --check-prefix=CHECK-POS %s +! RUN: %flang -### -S -fno-init-global-zero %s -o - 2>&1 | FileCheck --check-prefix=CHECK-NEG %s +! Check that the compiler accepts -f[no-]init-global-zero: +! RUN: %flang_fc1 -emit-hlfir -finit-global-zero %s -o - +! RUN: %flang_fc1 -emit-hlfir -fno-init-global-zero %s -o - + +! CHECK-POS: "-fc1"{{.*}}"-finit-global-zero" +! CHECK-NEG: "-fc1"{{.*}}"-fno-init-global-zero" diff --git a/flang/test/Lower/zero_init.f90 b/flang/test/Lower/zero_init.f90 new file mode 100644 index 00000000000000..5ed6f2247de3b2 --- /dev/null +++ b/flang/test/Lower/zero_init.f90 @@ -0,0 +1,20 @@ +! RUN: %flang_fc1 -emit-hlfir -o - %s | FileCheck --check-prefix=CHECK-DEFAULT %s +! RUN: %flang_fc1 -finit-global-zero -emit-hlfir -o - %s | FileCheck --check-prefix=CHECK-DEFAULT %s +! RUN: %flang_fc1 -fno-init-global-zero -emit-hlfir -o - %s | FileCheck --check-prefix=CHECK-NO-ZERO-INIT %s +! RUN: bbc -emit-hlfir -o - %s | FileCheck --check-prefix=CHECK-DEFAULT %s +! RUN: bbc -finit-global-zero -emit-hlfir -o - %s | FileCheck --check-prefix=CHECK-DEFAULT %s +! RUN: bbc -finit-global-zero=false -emit-hlfir -o - %s | FileCheck --check-prefix=CHECK-NO-ZERO-INIT %s + +module m1 + real :: x +end module m1 + +!CHECK-DEFAULT: fir.global @_QMm1Ex : f32 { +!CHECK-DEFAULT: %[[UNDEF:.*]] = fir.zero_bits f32 +!CHECK-DEFAULT: fir.has_value %[[UNDEF]] : f32 +!CHECK-DEFAULT: } + +!CHECK-NO-ZERO-INIT: fir.global @_QMm1Ex : f32 { +!CHECK-NO-ZERO-INIT: %[[UNDEF:.*]] = fir.undefined f32 +!CHECK-NO-ZERO-INIT: fir.has_value %[[UNDEF]] : f32 +!CHECK-NO-ZERO-INIT: } diff --git a/flang/test/Lower/zero_init_default_init.f90 b/flang/test/Lower/zero_init_default_init.f90 new file mode 100644 index 00000000000000..e2d1f545e35a57 --- /dev/null +++ b/flang/test/Lower/zero_init_default_init.f90 @@ -0,0 +1,22 @@ +! RUN: %flang_fc1 -emit-hlfir -o - %s | FileCheck %s +! RUN: %flang_fc1 -finit-global-zero -emit-hlfir -o - %s | FileCheck %s +! RUN: %flang_fc1 -fno-init-global-zero -emit-hlfir -o - %s | FileCheck %s +! RUN: bbc -emit-hlfir -o - %s | FileCheck %s +! RUN: bbc -finit-global-zero -emit-hlfir -o - %s | FileCheck %s +! RUN: bbc -finit-global-zero=false -emit-hlfir -o - %s | FileCheck %s + +! Test that the flag does not affect globals with default init + +module m2 + type val + integer :: my_val = 1 + end type val + type(val) :: v1 +end module m2 + +!CHECK: fir.global @_QMm2Ev1 : !fir.type<_QMm2Tval{my_val:i32}> { +!CHECK: %[[V1:.*]] = fir.undefined !fir.type<_QMm2Tval{my_val:i32}> +!CHECK: %[[ONE:.*]] = arith.constant 1 : i32 +!CHECK: %[[V1_INIT:.*]] = fir.insert_value %[[V1]], %[[ONE]], ["my_val", !fir.type<_QMm2Tval{my_val:i32}>] : (!fir.type<_QMm2Tval{my_val:i32}>, i32) -> !fir.type<_QMm2Tval{my_val:i32}> +!CHECK: fir.has_value %[[V1_INIT]] : !fir.type<_QMm2Tval{my_val:i32}> +!CHECK: } diff --git a/flang/tools/bbc/bbc.cpp b/flang/tools/bbc/bbc.cpp index 7efc460be86795..dafbcd856389a8 100644 --- a/flang/tools/bbc/bbc.cpp +++ b/flang/tools/bbc/bbc.cpp @@ -234,6 +234,11 @@ static llvm::cl::opt<bool> integerWrapAround( llvm::cl::desc("Treat signed integer overflow as two's complement"), llvm::cl::init(false)); +static llvm::cl::opt<bool> initGlobalZero( + "finit-global-zero", + llvm::cl::desc("Zero initialize globals without default initialization"), + llvm::cl::init(true)); + static llvm::cl::opt<bool> reallocateLHS("frealloc-lhs", llvm::cl::desc("Follow Fortran 2003 rules for (re)allocating " @@ -381,6 +386,7 @@ static llvm::LogicalResult convertFortranSourceToMLIR( loweringOptions.setNoPPCNativeVecElemOrder(enableNoPPCNativeVecElemOrder); loweringOptions.setLowerToHighLevelFIR(useHLFIR || emitHLFIR); loweringOptions.setIntegerWrapAround(integerWrapAround); + loweringOptions.setInitGlobalZero(initGlobalZero); loweringOptions.setReallocateLHS(reallocateLHS); std::vector<Fortran::lower::EnvironmentDefault> envDefaults = {}; Fortran::frontend::TargetOptions targetOpts; `````````` </details> https://github.com/llvm/llvm-project/pull/123606 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits