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Supply finished flag to EmitBlock for common statements which use 

landing pads.
 - Primarily a cleanliness issue instead of a performance issue (this
   eliminates all blocks w/o predecessors on 176.gcc/expr.c), but this
   also allows subsequent code to recognize it is unreachable and
   potentially avoid IRgen.

llvm-svn: 59211
This commit is contained in:
Daniel Dunbar 2008-11-13 01:54:24 +00:00
parent a612e79be4
commit df21c6e203
1 changed files with 6 additions and 9 deletions
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15
clang/lib/CodeGen/CGStmt.cpp
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@ -276,7 +276,7 @@ void CodeGenFunction::EmitIfStmt(const IfStmt &S) {
}
// Emit the continuation block for code after the if.
EmitBlock(ContBlock);
EmitBlock(ContBlock, true);
}
void CodeGenFunction::EmitWhileStmt(const WhileStmt &S) {
@ -299,7 +299,7 @@ void CodeGenFunction::EmitWhileStmt(const WhileStmt &S) {
// Create an exit block for when the condition fails, create a block for the
// body of the loop.
llvm::BasicBlock *ExitBlock = createBasicBlock("while.exit");
llvm::BasicBlock *ExitBlock = createBasicBlock("while.end");
llvm::BasicBlock *LoopBody = createBasicBlock("while.body");
// As long as the condition is true, go to the loop body.
@ -319,7 +319,7 @@ void CodeGenFunction::EmitWhileStmt(const WhileStmt &S) {
EmitBranch(LoopHeader);
// Emit the exit block.
EmitBlock(ExitBlock);
EmitBlock(ExitBlock, true);
// If LoopHeader is a simple forwarding block then eliminate it.
if (!EmitBoolCondBranch
@ -369,7 +369,7 @@ void CodeGenFunction::EmitDoStmt(const DoStmt &S) {
Builder.CreateCondBr(BoolCondVal, LoopBody, AfterDo);
// Emit the exit block.
EmitBlock(AfterDo);
EmitBlock(AfterDo, true);
// If DoCond is a simple forwarding block then eliminate it.
if (!EmitBoolCondBranch && &DoCond->front() == DoCond->getTerminator()) {
@ -382,9 +382,6 @@ void CodeGenFunction::EmitDoStmt(const DoStmt &S) {
void CodeGenFunction::EmitForStmt(const ForStmt &S) {
// FIXME: What do we do if the increment (f.e.) contains a stmt expression,
// which contains a continue/break?
// TODO: We could keep track of whether the loop body contains any
// break/continue statements and not create unnecessary blocks (like
// "afterfor" for a condless loop) if it doesn't.
// Evaluate the first part before the loop.
if (S.getInit())
@ -438,7 +435,7 @@ void CodeGenFunction::EmitForStmt(const ForStmt &S) {
EmitBranch(CondBlock);
// Emit the fall-through block.
EmitBlock(AfterFor);
EmitBlock(AfterFor, true);
}
void CodeGenFunction::EmitReturnOfRValue(RValue RV, QualType Ty) {
@ -652,7 +649,7 @@ void CodeGenFunction::EmitSwitchStmt(const SwitchStmt &S) {
}
// Emit continuation.
EmitBlock(NextBlock);
EmitBlock(NextBlock, true);
SwitchInsn = SavedSwitchInsn;
CaseRangeBlock = SavedCRBlock;