diff options
Diffstat (limited to 'clang/lib/Basic/TargetInfo.cpp')
| -rw-r--r-- | clang/lib/Basic/TargetInfo.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp index d455fa3956d..19cab14cbf4 100644 --- a/clang/lib/Basic/TargetInfo.cpp +++ b/clang/lib/Basic/TargetInfo.cpp @@ -39,6 +39,13 @@ TargetInfo::TargetInfo(const llvm::Triple &T) : TargetOpts(), Triple(T) { SuitableAlign = 64; DefaultAlignForAttributeAligned = 128; MinGlobalAlign = 0; + // From the glibc documentation, on GNU systems, malloc guarantees 16-byte + // alignment on 64-bit systems and 8-byte alignment on 32-bit systems. See + // https://www.gnu.org/software/libc/manual/html_node/Malloc-Examples.html + if (T.isGNUEnvironment()) + NewAlign = Triple.isArch64Bit() ? 128 : Triple.isArch32Bit() ? 64 : 0; + else + NewAlign = 0; // Infer from basic type alignment. HalfWidth = 16; HalfAlign = 16; FloatWidth = 32; @@ -320,6 +327,9 @@ void TargetInfo::adjust(const LangOptions &Opts) { FloatFormat = &llvm::APFloat::IEEEsingle; LongDoubleFormat = &llvm::APFloat::IEEEquad; } + + if (Opts.NewAlignOverride) + NewAlign = Opts.NewAlignOverride * getCharWidth(); } bool TargetInfo::initFeatureMap( |
