Author: ddunbar
Date: Mon Jan 26 15:25:20 2009
New Revision: 63038
URL: http://llvm.org/viewvc/llvm-project?rev=63038&view=rev
Log:
Skip emission of final return block if possible (e.g., functions with
a unified return).
Modified:
cfe/trunk/lib/CodeGen/CodeGenFunction.cpp
Modified: cfe/trunk/lib/CodeGen/CodeGenFunction.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenFunction.cpp?rev=63038&r1=63037&r2=63038&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CodeGenFunction.cpp (original)
+++ cfe/trunk/lib/CodeGen/CodeGenFunction.cpp Mon Jan 26 15:25:20 2009
@@ -77,9 +77,13 @@
assert(BreakContinueStack.empty() &&
"mismatched push/pop in break/continue stack!");
- // Emit function epilog (to return). This has the nice side effect
- // of also automatically handling code that falls off the end.
- EmitBlock(ReturnBlock);
+ // Emit function epilog (to return). For cleanliness, skip emission
+ // if we know it is safe (when it is unused and the current block is
+ // unterminated).
+ if (!ReturnBlock->use_empty() ||
+ !Builder.GetInsertBlock() ||
+ Builder.GetInsertBlock()->getTerminator())
+ EmitBlock(ReturnBlock);
// Emit debug descriptor for function end.
if (CGDebugInfo *DI = CGM.getDebugInfo()) {
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