[CodeGen] Add thumb-mode to target-features for arm/thumb triples.
Summary:
The thumb-mode target feature is used to force Thumb or ARM code
generation on a per-function basis. Explicitly adding +thumb-mode to
functions for thumbxx triples enables mixed ARM/Thumb code generation in
places where compilation units with thumbxx and armxx triples are merged
together (e.g. the IR linker or LTO).
For armxx triples, -thumb-mode is added in a similar fashion.
Reviewers: echristo, t.p.northover, kristof.beyls, rengolin
Reviewed By: echristo
Subscribers: rinon, aemerson, mehdi_amini, javed.absar, cfe-commits
Differential Revision: https://reviews.llvm.org/D33448
llvm-svn: 304897
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index a304a78..89f192a 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -5442,6 +5442,13 @@
if (Feature[0] == '+')
Features[Feature.drop_front(1)] = true;
+ // Enable or disable thumb-mode explicitly per function to enable mixed
+ // ARM and Thumb code generation.
+ if (isThumb())
+ Features["thumb-mode"] = true;
+ else
+ Features["thumb-mode"] = false;
+
// Convert user-provided arm and thumb GNU target attributes to
// [-|+]thumb-mode target features respectively.
std::vector<std::string> UpdatedFeaturesVec(FeaturesVec);