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Implement: Inline/cfg_preserve_test.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8099 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-08-24 04:06:56 +00:00
parent 7bf617ab02
commit 7152c237b4
1 changed files with 15 additions and 2 deletions
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17
lib/Transforms/Utils/InlineFunction.cpp
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@@ -9,12 +9,13 @@
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/Cloning.h" #include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h" #include "llvm/Module.h"
#include "llvm/iTerminators.h" #include "llvm/iTerminators.h"
#include "llvm/iPHINode.h" #include "llvm/iPHINode.h"
#include "llvm/iMemory.h" #include "llvm/iMemory.h"
#include "llvm/iOther.h" #include "llvm/iOther.h"
#include "llvm/DerivedTypes.h" #include "llvm/Transforms/Utils/Local.h"
// InlineFunction - This function inlines the called function into the basic // InlineFunction - This function inlines the called function into the basic
// block of the caller. This returns false if it is not possible to inline this // block of the caller. This returns false if it is not possible to inline this
@@ -42,7 +43,8 @@ bool InlineFunction(CallInst *CI) {
// immediately before the call. The original basic block now ends with an // immediately before the call. The original basic block now ends with an
// unconditional branch to NewBB, and NewBB starts with the call instruction. // unconditional branch to NewBB, and NewBB starts with the call instruction.
// //
BasicBlock *NewBB = OrigBB->splitBasicBlock(CI); BasicBlock *NewBB = OrigBB->splitBasicBlock(CI,
CalledFunc->getName()+".entry");
NewBB->setName(OrigBB->getName()+".split"); NewBB->setName(OrigBB->getName()+".split");
// Remove (unlink) the CallInst from the start of the new basic block. // Remove (unlink) the CallInst from the start of the new basic block.
@@ -160,5 +162,16 @@ bool InlineFunction(CallInst *CI) {
Caller->getBasicBlockList().splice(NewBB, Caller->getBasicBlockList(), Caller->getBasicBlockList().splice(NewBB, Caller->getBasicBlockList(),
LastBlock, Caller->end()); LastBlock, Caller->end());
// We should always be able to fold the entry block of the function into the
// single predecessor of the block...
assert(cast<BranchInst>(Br)->isUnconditional() && "splitBasicBlock broken!");
BasicBlock *CalleeEntry = cast<BranchInst>(Br)->getSuccessor(0);
SimplifyCFG(CalleeEntry);
// Okay, continue the CFG cleanup. It's often the case that there is only a
// single return instruction in the callee function. If this is the case,
// then we have an unconditional branch from the return block to the 'NewBB'.
// Check for this case, and eliminate the branch is possible.
SimplifyCFG(NewBB);
return true; return true;
} }