[flang-commits] [clang] [flang] [flang]Add support for -moutline-atomics and -mno-outline-atomics (PR #78755)
Mats Petersson via flang-commits
flang-commits at lists.llvm.org
Fri Jan 19 10:39:40 PST 2024
https://github.com/Leporacanthicus created https://github.com/llvm/llvm-project/pull/78755
This adds the support to add the target-feature.
It will be fully supported once the generic support for adding target-cpu and target-features attributes to functions has landed. See #78289. Regression tests for that will be added once that PR lands.
>From 1bf1060607dc8d4fedb227de35271e0b0307f564 Mon Sep 17 00:00:00 2001
From: Mats Petersson <mats.petersson at arm.com>
Date: Fri, 19 Jan 2024 16:30:31 +0000
Subject: [PATCH] [flang]Add support for -moutline-atomics and
-mno-outline-atomics
Clang has support for genarting atomic operations as functions rather
than inline atomic operations, using a target feature.
This is useful for code-size, some cases of debugging, and it also affects
the ability to inline functions from C into Fortran or the other way around
when using LTO - the inliner will check the target features to make sure
functions are compatible, and a difference in outline-atomics would disable
the inlining of an outline-atomics into a non-outline-atomics function.
---
clang/include/clang/Driver/Options.td | 4 ++--
clang/lib/Driver/ToolChains/Flang.cpp | 23 ++++++++++++++++++-
flang/lib/Frontend/CompilerInvocation.cpp | 15 ++++++++++++
flang/test/Driver/aarch64-outline-atomics.f90 | 11 +++++++++
flang/test/Driver/driver-help-hidden.f90 | 2 ++
flang/test/Driver/driver-help.f90 | 4 ++++
6 files changed, 56 insertions(+), 3 deletions(-)
create mode 100644 flang/test/Driver/aarch64-outline-atomics.f90
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index d2e6c3ff721c27..b8be694bf0bf80 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4960,10 +4960,10 @@ def mno_fmv : Flag<["-"], "mno-fmv">, Group<f_clang_Group>,
Visibility<[ClangOption, CC1Option]>,
HelpText<"Disable function multiversioning">;
def moutline_atomics : Flag<["-"], "moutline-atomics">, Group<f_clang_Group>,
- Visibility<[ClangOption, CC1Option]>,
+ Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>,
HelpText<"Generate local calls to out-of-line atomic operations">;
def mno_outline_atomics : Flag<["-"], "mno-outline-atomics">, Group<f_clang_Group>,
- Visibility<[ClangOption, CC1Option]>,
+ Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>,
HelpText<"Don't generate local calls to out-of-line atomic operations">;
def mno_implicit_float : Flag<["-"], "mno-implicit-float">, Group<m_Group>,
HelpText<"Don't generate implicit floating point or vector instructions">;
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index 03d68c3df7fb37..7394ef6f601c7e 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -354,6 +354,27 @@ void Flang::addTargetOptions(const ArgList &Args,
CmdArgs.push_back(Args.MakeArgString(CPU));
}
+ if (Arg *A = Args.getLastArg(options::OPT_moutline_atomics,
+ options::OPT_mno_outline_atomics)) {
+ // Option -moutline-atomics supported for AArch64 target only.
+ if (!Triple.isAArch64()) {
+ D.Diag(diag::warn_drv_moutline_atomics_unsupported_opt)
+ << Triple.getArchName() << A->getOption().getName();
+ } else {
+ if (A->getOption().matches(options::OPT_moutline_atomics)) {
+ CmdArgs.push_back("-target-feature");
+ CmdArgs.push_back("+outline-atomics");
+ } else {
+ CmdArgs.push_back("-target-feature");
+ CmdArgs.push_back("-outline-atomics");
+ }
+ }
+ } else if (Triple.isAArch64() &&
+ getToolChain().IsAArch64OutlineAtomicsDefault(Args)) {
+ CmdArgs.push_back("-target-feature");
+ CmdArgs.push_back("+outline-atomics");
+ }
+
// Add the target features.
switch (TC.getArch()) {
default:
@@ -674,7 +695,7 @@ void Flang::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back(Args.MakeArgString(TripleStr));
if (isa<PreprocessJobAction>(JA)) {
- CmdArgs.push_back("-E");
+ CmdArgs.push_back("-E");
} else if (isa<CompileJobAction>(JA) || isa<BackendJobAction>(JA)) {
if (JA.getType() == types::TY_Nothing) {
CmdArgs.push_back("-fsyntax-only");
diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index a3c41fb4611f56..74127327e798e6 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -402,6 +402,21 @@ static void parseTargetArgs(TargetOptions &opts, llvm::opt::ArgList &args) {
for (const llvm::opt::Arg *currentArg :
args.filtered(clang::driver::options::OPT_target_feature))
opts.featuresAsWritten.emplace_back(currentArg->getValue());
+
+ llvm::Triple targetTriple{llvm::Triple(opts.triple)};
+ if (const llvm::opt::Arg *A =
+ args.getLastArg(clang::driver::options::OPT_moutline_atomics,
+ clang::driver::options::OPT_mno_outline_atomics)) {
+ // Option -moutline-atomics supported for AArch64 target only.
+ if (!targetTriple.isAArch64()) {
+ if (A->getOption().matches(
+ clang::driver::options::OPT_moutline_atomics)) {
+ opts.featuresAsWritten.push_back("+outline-atomics");
+ } else {
+ opts.featuresAsWritten.push_back("-outline-atomics");
+ }
+ }
+ }
}
// Tweak the frontend configuration based on the frontend action
diff --git a/flang/test/Driver/aarch64-outline-atomics.f90 b/flang/test/Driver/aarch64-outline-atomics.f90
new file mode 100644
index 00000000000000..f469d50290ef04
--- /dev/null
+++ b/flang/test/Driver/aarch64-outline-atomics.f90
@@ -0,0 +1,11 @@
+! Test that flang-new forwards the -moutline-atomics and -mno-outline-atomics.
+! RUN: %flang -moutline-atomics --target=aarch64-none-none -### %s -o %t 2>&1 | FileCheck %s
+! CHECK: "-target-feature" "+outline-atomics"
+
+! RUN: %flang -mno-outline-atomics --target=aarch64-none-none -### %s -o %t 2>&1 | FileCheck %s --check-prefix=CHECK-NOOUTLINE
+! CHECK-NOOUTLINE: "-target-feature" "-outline-atomics"
+
+! RUN: %flang -mno-outline-atomics --target=x86-none-none -### %s -o %t 2>&1 | FileCheck %s --check-prefix=CHECK-ERRMSG
+! CHECK-ERRMSG: warning: 'x86' does not support '-mno-outline-atomics'
+
+
diff --git a/flang/test/Driver/driver-help-hidden.f90 b/flang/test/Driver/driver-help-hidden.f90
index 426b0e5a1c367d..13698b65ae461b 100644
--- a/flang/test/Driver/driver-help-hidden.f90
+++ b/flang/test/Driver/driver-help-hidden.f90
@@ -122,7 +122,9 @@
! CHECK-NEXT: -mllvm=<arg> Alias for -mllvm
! CHECK-NEXT: -mllvm <value> Additional arguments to forward to LLVM's option processing
! CHECK-NEXT: -mmlir <value> Additional arguments to forward to MLIR's option processing
+! CHECK-NEXT: -mno-outline-atomics Don't generate local calls to out-of-line atomic operations
! CHECK-NEXT: -module-dir <dir> Put MODULE files in <dir>
+! CHECK-NEXT: -moutline-atomics Generate local calls to out-of-line atomic operations
! CHECK-NEXT: -mrvv-vector-bits=<value>
! CHECK-NEXT: Specify the size in bits of an RVV vector register
! CHECK-NEXT: -msve-vector-bits=<value>
diff --git a/flang/test/Driver/driver-help.f90 b/flang/test/Driver/driver-help.f90
index 221da6439764b4..73f5d6ee846d3a 100644
--- a/flang/test/Driver/driver-help.f90
+++ b/flang/test/Driver/driver-help.f90
@@ -108,7 +108,9 @@
! HELP-NEXT: -mllvm=<arg> Alias for -mllvm
! HELP-NEXT: -mllvm <value> Additional arguments to forward to LLVM's option processing
! HELP-NEXT: -mmlir <value> Additional arguments to forward to MLIR's option processing
+! HELP-NEXT: -mno-outline-atomics Don't generate local calls to out-of-line atomic operations
! HELP-NEXT: -module-dir <dir> Put MODULE files in <dir>
+! HELP-NEXT: -moutline-atomics Generate local calls to out-of-line atomic operations
! HELP-NEXT: -mrvv-vector-bits=<value>
! HELP-NEXT: Specify the size in bits of an RVV vector register
! HELP-NEXT: -msve-vector-bits=<value>
@@ -246,8 +248,10 @@
! HELP-FC1-NEXT: -mframe-pointer=<value> Specify which frame pointers to retain.
! HELP-FC1-NEXT: -mllvm <value> Additional arguments to forward to LLVM's option processing
! HELP-FC1-NEXT: -mmlir <value> Additional arguments to forward to MLIR's option processing
+! HELP-FC1-NEXT: -mno-outline-atomics Don't generate local calls to out-of-line atomic operations
! HELP-FC1-NEXT: -module-dir <dir> Put MODULE files in <dir>
! HELP-FC1-NEXT: -module-suffix <suffix> Use <suffix> as the suffix for module files (the default value is `.mod`)
+! HELP-FC1-NEXT: -moutline-atomics Generate local calls to out-of-line atomic operations
! HELP-FC1-NEXT: -mreassociate Allow reassociation transformations for floating-point instructions
! HELP-FC1-NEXT: -mrelocation-model <value>
! HELP-FC1-NEXT: The relocation model to use
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