[X86] Add -malign-double support
The -malign-double flag causes i64 and f64 types to have alignment 8
instead of 4. On x86-64, the behavior of -malign-double is enabled by default.
Rebases and cleans phosek's work here: http://reviews.llvm.org/D12860
Patch by Sean Klein
Reviewers: rnk
Subscribers: rnk, jfb, dschuff, phosek
Differential Revision: http://reviews.llvm.org/D19734
llvm-svn: 268473
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 40d6001..f6973f3 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -275,6 +275,10 @@
UseBitFieldTypeAlignment = false;
if (Opts.ShortWChar)
WCharType = UnsignedShort;
+ if (Opts.AlignDouble) {
+ DoubleAlign = LongLongAlign = 64;
+ LongDoubleAlign = 64;
+ }
if (Opts.OpenCL) {
// OpenCL C requires specific widths for types, irrespective of