https://github.com/paschalis-mpeis updated
https://github.com/llvm/llvm-project/pull/78749
>From c342eea051da7eed2ef4541e5daf445114258e1d Mon Sep 17 00:00:00 2001
From: Paschalis Mpeis <paschalis.mp...@arm.com>
Date: Fri, 19 Jan 2024 16:27:20 +0000
Subject: [PATCH] [LTO] Fix Veclib flags correctly pass to LTO flags
Flags `-fveclib=name` were not passed to LTO flags.
This pass fixes that by converting the `-fveclib` flags to their
relevant names for opt's `-vector-lib=name` flags.
For example:
`-fveclib=SLEEF` would become `-vector-library=sleefgnuabi` and passed
through the -plugin-opt` flag.
---
clang/lib/Driver/ToolChains/CommonArgs.cpp | 22 ++++++++++++++++++++
clang/test/Driver/fveclib.c | 24 ++++++++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp
b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 385f66f3782bc1..470145849e4187 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -783,6 +783,28 @@ void tools::addLTOOptions(const ToolChain &ToolChain,
const ArgList &Args,
"-generate-arange-section"));
}
+ // Pass vector library arguments to LTO.
+ Arg *ArgVecLib = Args.getLastArg(options::OPT_fveclib);
+ if (ArgVecLib && ArgVecLib->getNumValues() == 1) {
+ // Map the vector library names from clang front-end to opt front-end. The
+ // values are taken from the TargetLibraryInfo class command line options.
+ std::optional<StringRef> OptVal =
+ llvm::StringSwitch<std::optional<StringRef>>(ArgVecLib->getValue())
+ .Case("Accelerate", "Accelerate")
+ .Case("LIBMVEC", "LIBMVEC-X86")
+ .Case("MASSV", "MASSV")
+ .Case("SVML", "SVML")
+ .Case("SLEEF", "sleefgnuabi")
+ .Case("Darwin_libsystem_m", "Darwin_libsystem_m")
+ .Case("ArmPL", "ArmPL")
+ .Case("none", "none")
+ .Default(std::nullopt);
+
+ if (OptVal)
+ CmdArgs.push_back(Args.MakeArgString(
+ Twine(PluginOptPrefix) + "-vector-library=" + OptVal.value()));
+ }
+
// Try to pass driver level flags relevant to LTO code generation down to
// the plugin.
diff --git a/clang/test/Driver/fveclib.c b/clang/test/Driver/fveclib.c
index e2a7619e9b89f7..ffe6937bd22ccc 100644
--- a/clang/test/Driver/fveclib.c
+++ b/clang/test/Driver/fveclib.c
@@ -31,3 +31,27 @@
// RUN: %clang -fveclib=Accelerate %s -nodefaultlibs -target
arm64-apple-ios8.0.0 -### 2>&1 | FileCheck
--check-prefix=CHECK-LINK-NODEFAULTLIBS %s
// CHECK-LINK-NODEFAULTLIBS-NOT: "-framework" "Accelerate"
+
+
+/* Verify that the correct vector library is passed to LTO flags. */
+
+// RUN: %clang -### -fveclib=Accelerate -flto %s -v 2>&1 | FileCheck
-check-prefix CHECK-LTO-ACCELERATE %s
+// CHECK-LTO-ACCELERATE: "-plugin-opt=-vector-library=Accelerate"
+
+// RUN: %clang -### --target=x86_64-unknown-linux-gnu -fveclib=LIBMVEC -flto
%s -v 2>&1 | FileCheck -check-prefix CHECK-LTO-LIBMVEC %s
+// CHECK-LTO-LIBMVEC: "-plugin-opt=-vector-library=LIBMVEC-X86"
+
+// RUN: %clang -### -fveclib=MASSV -flto %s -v 2>&1 | FileCheck -check-prefix
CHECK-LTO-MASSV %s
+// CHECK-LTO-MASSV: "-plugin-opt=-vector-library=MASSV"
+
+// RUN: %clang -### --target=x86_64-unknown-linux-gnu -fveclib=SVML -flto %s
-v 2>&1 | FileCheck -check-prefix CHECK-LTO-SVML %s
+// CHECK-LTO-SVML: "-plugin-opt=-vector-library=SVML"
+
+// RUN: %clang -### --target=aarch64-linux-gnu -fveclib=SLEEF -flto %s -v 2>&1
| FileCheck -check-prefix CHECK-LTO-SLEEF %s
+// CHECK-LTO-SLEEF: "-plugin-opt=-vector-library=sleefgnuabi"
+
+// RUN: %clang -### -fveclib=Darwin_libsystem_m -flto %s -v 2>&1 | FileCheck
-check-prefix CHECK-LTO-DARWIN %s
+// CHECK-LTO-DARWIN: "-plugin-opt=-vector-library=Darwin_libsystem_m"
+
+// RUN: %clang -### --target=aarch64-linux-gnu -fveclib=ArmPL -flto %s -v 2>&1
| FileCheck -check-prefix CHECK-LTO-ARMPL %s
+// CHECK-LTO-ARMPL: "-plugin-opt=-vector-library=ArmPL"
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