Revert the recent alignment changes. They're broken for -Os because,

in particular, they end up aligning strings at 16-byte boundaries, and
there's no way for GlobalOpt to check OptForSize.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100172 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 4 insertions, 16 deletions

diff --git a/lib/Target/TargetData.cpp b/lib/Target/TargetData.cpp
index 652fc18..643b397 100644
--- a/lib/Target/TargetData.cpp
+++ b/lib/Target/TargetData.cpp
@@ -651,7 +651,7 @@ unsigned TargetData::getPreferredAlignment(const GlobalVariable *GV) const {
     if (Alignment < 16) {
       // If the global is not external, see if it is large.  If so, give it a
       // larger alignment.
-      if (getTypeSizeInBits(ElemType) >= 128)
+      if (getTypeSizeInBits(ElemType) > 128)
         Alignment = 16;    // 16-byte alignment.
     }
   }
diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp
index c09e78e..ddff5ef 100644
--- a/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/lib/Transforms/IPO/GlobalOpt.cpp
@@ -1880,7 +1880,6 @@ bool GlobalOpt::OptimizeFunctions(Module &M) {
 
 bool GlobalOpt::OptimizeGlobalVars(Module &M) {
   bool Changed = false;
-  TargetData *TD = getAnalysisIfAvailable<TargetData>();
   for (Module::global_iterator GVI = M.global_begin(), E = M.global_end();
        GVI != E; ) {
     GlobalVariable *GV = GVI++;
@@ -1890,16 +1889,11 @@ bool GlobalOpt::OptimizeGlobalVars(Module &M) {
     // Simplify the initializer.
     if (GV->hasInitializer())
       if (ConstantExpr *CE = dyn_cast<ConstantExpr>(GV->getInitializer())) {
+        TargetData *TD = getAnalysisIfAvailable<TargetData>();
         Constant *New = ConstantFoldConstantExpression(CE, TD);
         if (New && New != CE)
           GV->setInitializer(New);
       }
-    // Refine the alignment value.
-    if (TD && GV->hasDefinitiveInitializer()) {
-      unsigned Align = TD->getPreferredAlignment(GV);
-      if (Align > GV->getAlignment())
-        GV->setAlignment(Align);
-    }
     // Do more involved optimizations if the global is internal.
     if (!GV->isConstant() && GV->hasLocalLinkage() &&
         GV->hasInitializer())
diff --git a/test/CodeGen/X86/global-sections.ll b/test/CodeGen/X86/global-sections.ll
index 2aba834..d79c56b 100644
--- a/test/CodeGen/X86/global-sections.ll
+++ b/test/CodeGen/X86/global-sections.ll
@@ -113,7 +113,7 @@
 ; DARWIN:	.globl _G9
 ; DARWIN: _G9:
 
-; LINUX:	.section		.rodata.str4.16,"aMS",@progbits,4
+; LINUX:	.section		.rodata.str4.4,"aMS",@progbits,4
 ; LINUX:	.globl G9
 ; LINUX:G9
 
diff --git a/test/CodeGen/X86/vec_shuffle-6.ll b/test/CodeGen/X86/vec_shuffle-6.ll
index 28fd59b..f034b0a 100644
--- a/test/CodeGen/X86/vec_shuffle-6.ll
+++ b/test/CodeGen/X86/vec_shuffle-6.ll
@@ -4,7 +4,7 @@
 ; RUN: grep movups %t | count 2
 
 target triple = "i686-apple-darwin"
-@x = external global [4 x i32]
+@x = global [4 x i32] [ i32 1, i32 2, i32 3, i32 4 ]		; <[4 x i32]*> [#uses=4]
 
 define <2 x i64> @test1() {
 	%tmp = load i32* getelementptr ([4 x i32]* @x, i32 0, i32 0)		; <i32> [#uses=1]
diff --git a/test/Transforms/GlobalOpt/gv-align.ll b/test/Transforms/GlobalOpt/gv-align.ll
deleted file mode 100644
index f99e8a6..0000000
--- a/test/Transforms/GlobalOpt/gv-align.ll
+++ /dev/null
@@ -1,6 +0,0 @@
-; RUN: opt -globalopt -S < %s | grep {, align 16}
-
-; Globalopt should refine the alignment for global variables.
-
-target datalayout = "e-p:64:64:64"
-@a = global [4 x i32] [i32 2, i32 3, i32 4, i32 5 ]