[ARM] Add support for target("arm") and target("thumb").
Summary:
This patch adds support for the target("arm") and target("thumb")
attributes, which can be used to force the compiler to generated ARM or
Thumb code for a function.
In LLVM, ARM or Thumb code generation can be controlled by the
thumb-mode target feature. But GCC already uses target("arm") and
target("thumb"), so we have to substitute "arm" with -thumb-mode and
"thumb" with +thumb-mode.
Reviewers: echristo, pcc, kristof.beyls
Reviewed By: echristo
Subscribers: ahatanak, aemerson, javed.absar, kristof.beyls, cfe-commits
Differential Revision: https://reviews.llvm.org/D33721
llvm-svn: 304781
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 605f738..bb8d818 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -5438,7 +5438,17 @@
if (Feature[0] == '+')
Features[Feature.drop_front(1)] = true;
- return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
+ // Convert user-provided arm and thumb GNU target attributes to
+ // [-|+]thumb-mode target features respectively.
+ std::vector<std::string> UpdatedFeaturesVec(FeaturesVec);
+ for (auto &Feature : UpdatedFeaturesVec) {
+ if (Feature.compare("+arm") == 0)
+ Feature = "-thumb-mode";
+ else if (Feature.compare("+thumb") == 0)
+ Feature = "+thumb-mode";
+ }
+
+ return TargetInfo::initFeatureMap(Features, Diags, CPU, UpdatedFeaturesVec);
}
bool handleTargetFeatures(std::vector<std::string> &Features,