[cfe-commits] r51676 - in /cfe/trunk: lib/CodeGen/CodeGenModule.cpp test/CodeGen/var-align.c

[Eli Friedman]

Author: efriedma
Date: Thu May 29 06:10:27 2008
New Revision: 51676

URL: http://llvm.org/viewvc/llvm-project?rev=51676&view=rev
Log:
Add CodeGen support for alignment on globals, both for unusual natural 
alignment and alignment attributes.


Added:
    cfe/trunk/test/CodeGen/var-align.c
Modified:
    cfe/trunk/lib/CodeGen/CodeGenModule.cpp

Modified: cfe/trunk/lib/CodeGen/CodeGenModule.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenModule.cpp?rev=51676&r1=51675&r2=51676&view=diff

==============================================================================
--- cfe/trunk/lib/CodeGen/CodeGenModule.cpp (original)
+++ cfe/trunk/lib/CodeGen/CodeGenModule.cpp Thu May 29 06:10:27 2008
@@ -477,6 +477,12 @@
          "Initializer codegen type mismatch!");
   GV->setInitializer(Init);
 
+  unsigned Align = Context.getTypeAlign(D->getType());
+  if (const AlignedAttr* AA = D->getAttr<AlignedAttr>()) {
+    Align = std::max(Align, AA->getAlignment());
+  }
+  GV->setAlignment(Align / 8);
+
   if (const VisibilityAttr *attr = D->getAttr<VisibilityAttr>())
     setVisibility(GV, attr->getVisibility());
   // FIXME: else handle -fvisibility

Added: cfe/trunk/test/CodeGen/var-align.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/var-align.c?rev=51676&view=auto

==============================================================================
--- cfe/trunk/test/CodeGen/var-align.c (added)
+++ cfe/trunk/test/CodeGen/var-align.c Thu May 29 06:10:27 2008
@@ -0,0 +1,4 @@
+// RUN: clang -emit-llvm %s -o - | grep "align 16" | count 2
+
+__attribute((aligned(16))) float a[128];
+union {int a[4]; __attribute((aligned(16))) float b[4];} u;