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[AArch64] Pass subtarget feature "+reserve-x18" instead of passing backend

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option "-aarch64-reserve-x18".

This change is needed since backend options do not make it to the backend
when doing LTO and are not capable of changing the behavior of code-gen
passes on a per-function basis.

rdar://problem/21529937

Differential Revision: http://reviews.llvm.org/D11462

llvm-svn: 243185
This commit is contained in:
Akira Hatanaka
2015-07-25 00:18:00 +00:00
parent c34eed3045
commit 4e3c86fe99
1 changed files with 3 additions and 5 deletions
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8
clang/lib/Driver/Tools.cpp
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@@ -919,11 +919,6 @@ void Clang::AddAArch64TargetArgs(const ArgList &Args,
else
CmdArgs.push_back("-aarch64-global-merge=true");
}
if (Args.hasArg(options::OPT_ffixed_x18)) {
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-aarch64-reserve-x18");
}
}
// Get CPU and ABI names. They are not independent
@@ -1971,6 +1966,9 @@ static void getAArch64TargetFeatures(const Driver &D, const ArgList &Args,
else
Features.push_back("-crc");
}
if (Args.hasArg(options::OPT_ffixed_x18))
Features.push_back("+reserve-x18");
}
static void getTargetFeatures(const Driver &D, const llvm::Triple &Triple,