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Add a mno-outline flag to disable the MachineOutliner 

Since we're working on turning the MachineOutliner by default under -Oz for
AArch64, it makes sense to have an -mno-outline flag available. This currently
doesn't do much (it basically just undoes -moutline).

When the MachineOutliner is on by default under AArch64, this flag should
set -mllvm -enable-machine-outliner=never.

llvm-svn: 331810
This commit is contained in:
Jessica Paquette 2018-05-08 20:58:32 +00:00
parent 966d34563f
commit 544bb55a3e
3 changed files with 11 additions and 3 deletions
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2
clang/include/clang/Driver/Options.td
View File

@ -1908,6 +1908,8 @@ def mms_bitfields : Flag<["-"], "mms-bitfields">, Group<m_Group>, Flags<[CC1Opti
HelpText<"Set the default structure layout to be compatible with the Microsoft compiler standard">;
def moutline : Flag<["-"], "moutline">, Group<f_clang_Group>, Flags<[CC1Option]>,
HelpText<"Enable function outlining (AArch64 only)">;
def mno_outline : Flag<["-"], "mno-outline">, Group<f_clang_Group>, Flags<[CC1Option]>,
HelpText<"Disable function outlining (AArch64 only)">;
def mno_ms_bitfields : Flag<["-"], "mno-ms-bitfields">, Group<m_Group>,
HelpText<"Do not set the default structure layout to be compatible with the Microsoft compiler standard">;
def mstackrealign : Flag<["-"], "mstackrealign">, Group<m_Group>, Flags<[CC1Option]>,

3
clang/lib/Driver/ToolChains/Clang.cpp
View File

@ -1485,7 +1485,8 @@ void Clang::AddAArch64TargetArgs(const ArgList &Args,
CmdArgs.push_back("-aarch64-enable-global-merge=true");
}
if (Args.getLastArg(options::OPT_moutline)) {
if (!Args.hasArg(options::OPT_mno_outline) &&
Args.getLastArg(options::OPT_moutline)) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-enable-machine-outliner");
}

9
clang/test/Driver/aarch64-outliner.c
View File

@ -1,4 +1,9 @@
// REQUIRES: aarch64-registered-target
// RUN: %clang -target aarch64 -moutline -S %s -### 2>&1 | FileCheck %s
// CHECK: "-mllvm" "-enable-machine-outliner"
// RUN: %clang -target aarch64 -moutline -S %s -### 2>&1 | FileCheck %s -check-prefix=ON
// ON: "-mllvm" "-enable-machine-outliner"
// RUN: %clang -target aarch64 -moutline -mno-outline -S %s -### 2>&1 | FileCheck %s -check-prefix=OFF1
// RUN: %clang -target aarch64 -mno-outline -moutline -S %s -### 2>&1 | FileCheck %s -check-prefix=OFF2
// OFF1-NOT: "-mllvm" "-enable-machine-outliner"
// OFF2-NOT: "-mllvm" "-enable-machine-outliner"