Revert patches 348835 and 348571 because they're

causing code size performance regressions.

llvm-svn: 350402

llvm/lib/IR/ConstantFold.cpp

@@ -27,7 +27,6 @@
 #include "llvm/IR/GlobalAlias.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/Instructions.h"
-#include "llvm/IR/Module.h"
 #include "llvm/IR/Operator.h"
 #include "llvm/IR/PatternMatch.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -1078,10 +1077,10 @@ Constant *llvm::ConstantFoldBinaryInstruction(unsigned Opcode, Constant *C1,
             isa<GlobalValue>(CE1->getOperand(0))) {
           GlobalValue *GV = cast<GlobalValue>(CE1->getOperand(0));
 
-          unsigned GVAlign =
-              GV->getParent()
-                  ? GV->getPointerAlignment(GV->getParent()->getDataLayout())
-                  : 0;
+          // Functions are at least 4-byte aligned.
+          unsigned GVAlign = GV->getAlignment();
+          if (isa<Function>(GV))
+            GVAlign = std::max(GVAlign, 4U);
 
           if (GVAlign > 1) {
             unsigned DstWidth = CI2->getType()->getBitWidth();

llvm/test/Analysis/ConstantFolding/func-and-folding.ll

@@ -1,27 +0,0 @@
-; RUN: opt < %s -constprop -S -o - | FileCheck %s
-
-; Function Attrs: minsize norecurse nounwind optsize readnone
-define void @foo1() #0 {
-entry:
-  ret void
-}
-
-; Function Attrs: minsize norecurse nounwind optsize readnone
-define void @foo2() align 4 {
-entry:
-  ret void
-}
-
-; Function Attrs: minsize nounwind optsize
-define i32 @main() local_unnamed_addr #1 {
-entry:
-; CHECK: ptrtoint
-  %call = tail call i32 bitcast (i32 (...)* @process to i32 (i32)*)(i32 and (i32 ptrtoint (void ()* @foo1 to i32), i32 2)) #3
-; CHECK-NEXT: ptrtoint
-  %call2 = tail call i32 bitcast (i32 (...)* @process to i32 (i32)*)(i32 and (i32 ptrtoint (void ()* @foo2 to i32), i32 2)) #3
-  ret i32 0
-}
-
-; Function Attrs: minsize optsize
-declare i32 @process(...) local_unnamed_addr #2
-

llvm/test/Assembler/2004-03-07-FunctionAddressAlignment.ll

@@ -0,0 +1,16 @@
+; RUN: llvm-as < %s | llvm-dis | not grep ptrtoint
+; RUN: verify-uselistorder %s
+; All of these should be eliminable
+
+
+define i32 @foo() {
+	ret i32 and (i32 ptrtoint (i32()* @foo to i32), i32 1)
+}
+
+define i32 @foo2() {
+	ret i32 and (i32 1, i32 ptrtoint (i32()* @foo2 to i32))
+}
+
+define i1 @foo3() {
+	ret i1 icmp ne (i1()* @foo3, i1()* null)
+}