55 lines
2.2 KiB
Diff
55 lines
2.2 KiB
Diff
Pull in r227062 from upstream clang trunk (by Renato Golin):
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Allows Clang to use LLVM's fixes-x18 option
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This patch allows clang to have llvm reserve the x18
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platform register on AArch64. FreeBSD will use this in the kernel for
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per-cpu data but has no need to reserve this register in userland so
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will need this flag to reserve it.
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This uses llvm r226664 to allow this register to be reserved.
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Patch by Andrew Turner.
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Introduced here: http://svnweb.freebsd.org/changeset/base/277775
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Index: tools/clang/include/clang/Driver/Options.td
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===================================================================
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--- tools/clang/include/clang/Driver/Options.td
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+++ tools/clang/include/clang/Driver/Options.td
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@@ -1141,6 +1141,9 @@ def mno_long_calls : Flag<["-"], "mno-long-calls">
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def mgeneral_regs_only : Flag<["-"], "mgeneral-regs-only">, Group<m_aarch64_Features_Group>,
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HelpText<"Generate code which only uses the general purpose registers (AArch64 only)">;
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+def ffixed_x18 : Flag<["-"], "ffixed-x18">, Group<m_aarch64_Features_Group>,
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+ HelpText<"Reserve the x18 register (AArch64 only)">;
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+
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def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;
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def mno_vsx : Flag<["-"], "mno-vsx">, Group<m_ppc_Features_Group>;
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def mfprnd : Flag<["-"], "mfprnd">, Group<m_ppc_Features_Group>;
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Index: tools/clang/lib/Driver/Tools.cpp
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===================================================================
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--- tools/clang/lib/Driver/Tools.cpp
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+++ tools/clang/lib/Driver/Tools.cpp
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@@ -887,6 +887,11 @@ void Clang::AddAArch64TargetArgs(const ArgList &Ar
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if (A->getOption().matches(options::OPT_mno_global_merge))
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CmdArgs.push_back("-mno-global-merge");
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}
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+
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+ if (Args.hasArg(options::OPT_ffixed_x18)) {
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+ CmdArgs.push_back("-backend-option");
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+ CmdArgs.push_back("-aarch64-reserve-x18");
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+ }
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}
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// Get CPU and ABI names. They are not independent
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Index: tools/clang/test/Driver/aarch64-fixed-x18.c
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===================================================================
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--- tools/clang/test/Driver/aarch64-fixed-x18.c
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+++ tools/clang/test/Driver/aarch64-fixed-x18.c
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@@ -0,0 +1,4 @@
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+// RUN: %clang -target aarch64-none-gnu -ffixed-x18 -### %s 2> %t
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+// RUN: FileCheck --check-prefix=CHECK-FIXED-X18 < %t %s
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+
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+// CHECK-FIXED-X18: "-backend-option" "-aarch64-reserve-x18"
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