For X86-64 linux and PPC64 linux align int128 to 16 bytes.

For other platforms we should find out what they need and likely
make the same change, however, a smaller additional change is easier
for platforms we know have it specified	in the ABI. As part of this
rewrite some of the handling in the backends for data layout and update
a bunch of testcases.

Based on a patch by Simonas Kazlauskas!

llvm-svn: 294702

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp b/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
index 5d68f32ccc5..8df1a89308f 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -120,6 +120,11 @@ static std::string getDataLayoutString(const Triple &T) {
   else
     Ret += "-f64:32:64";
 
+  // 128 bit integers are always aligned to 128 bits, but only 64-bit matters,
+  // because __int128 is only supoprted on 64-bit targets.
+  if (is64Bit && T.isOSLinux())
+    Ret += "-i128:128";
+
   // PPC64 has 32 and 64 bit registers, PPC32 has only 32 bit ones.
   if (is64Bit)
     Ret += "-n32:64";