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[AArch64] Pass subtarget feature "+strict-align". 

This commit changes the driver to save subtarget feature "+strict-align"
to the IR instead of using backend option "aarch64-strict-align". This is
needed for LTO.

rdar://problem/21529937

llvm-svn: 243518
This commit is contained in:
Akira Hatanaka 2015-07-29 14:25:58 +00:00
parent e46f7ed695
commit 085da7ecae
2 changed files with 7 additions and 11 deletions
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14
clang/lib/Driver/Tools.cpp
View File

@ -983,15 +983,6 @@ void Clang::AddAArch64TargetArgs(const ArgList &Args,
CmdArgs.push_back("-target-abi");
CmdArgs.push_back(ABIName);
if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
options::OPT_munaligned_access)) {
CmdArgs.push_back("-backend-option");
if (A->getOption().matches(options::OPT_mno_unaligned_access))
CmdArgs.push_back("-aarch64-strict-align");
else
CmdArgs.push_back("-aarch64-no-strict-align");
}
if (Arg *A = Args.getLastArg(options::OPT_mfix_cortex_a53_835769,
options::OPT_mno_fix_cortex_a53_835769)) {
CmdArgs.push_back("-backend-option");
@ -2068,6 +2059,11 @@ static void getAArch64TargetFeatures(const Driver &D,
Features.push_back("-crc");
}
if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
options::OPT_munaligned_access))
if (A->getOption().matches(options::OPT_mno_unaligned_access))
Features.push_back("+strict-align");
if (Args.hasArg(options::OPT_ffixed_x18) || Triple.isOSDarwin())
Features.push_back("+reserve-x18");
}

4
clang/test/Driver/arm-alignment.c
View File

@ -29,7 +29,7 @@
// RUN: FileCheck --check-prefix=CHECK-UNALIGNED-AARCH64 < %t %s
// CHECK-UNALIGNED-ARM-NOT: "-target-feature" "+strict-align"
// CHECK-UNALIGNED-AARCH64: "-backend-option" "-aarch64-no-strict-align"
// CHECK-UNALIGNED-AARCH64-NOT: "-target-feature" "+strict-align"
// RUN: %clang -target arm-none-gnueabi -mno-unaligned-access -### %s 2> %t
@ -75,7 +75,7 @@
// RUN: FileCheck --check-prefix=CHECK-ALIGNED-AARCH64 < %t %s
// CHECK-ALIGNED-ARM: "-target-feature" "+strict-align"
// CHECK-ALIGNED-AARCH64: "-backend-option" "-aarch64-strict-align"
// CHECK-ALIGNED-AARCH64: "-target-feature" "+strict-align"
// Make sure that v6M cores always trigger the unsupported aligned accesses error
// for all supported architecture triples.