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| author | Evan Cheng <evan.cheng@apple.com> | 2012-07-27 21:21:26 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2012-07-27 21:21:26 +0000 |
| commit | 249716e8aef5ac234a9a29f3ed3d0a931884192e (patch) | |
| tree | d4adb36ca78ae9eac416fa110cf079d4b723ed14 /llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp | |
| parent | 97e14e02f11a73c2705ac0cd8388b77fed59fc33 (diff) | |
| download | bcm5719-llvm-249716e8aef5ac234a9a29f3ed3d0a931884192e.tar.gz bcm5719-llvm-249716e8aef5ac234a9a29f3ed3d0a931884192e.zip | |
Teach CodeGenPrep to look past bitcast when it's duplicating return instruction
into predecessor blocks to enable tail call optimization.
rdar://11958338
llvm-svn: 160894
Diffstat (limited to 'llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp b/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp index f425cd03be6..4b4a8c598fc 100644 --- a/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp +++ b/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp @@ -645,10 +645,18 @@ bool CodeGenPrepare::DupRetToEnableTailCallOpts(ReturnInst *RI) { if (!TLI) return false; + PHINode *PN = 0; + BitCastInst *BCI = 0; Value *V = RI->getReturnValue(); - PHINode *PN = V ? dyn_cast<PHINode>(V) : NULL; - if (V && !PN) - return false; + if (V) { + BCI = dyn_cast<BitCastInst>(V); + if (BCI) + V = BCI->getOperand(0); + + PN = dyn_cast<PHINode>(V); + if (!PN) + return false; + } BasicBlock *BB = RI->getParent(); if (PN && PN->getParent() != BB) @@ -666,6 +674,9 @@ bool CodeGenPrepare::DupRetToEnableTailCallOpts(ReturnInst *RI) { if (PN) { BasicBlock::iterator BI = BB->begin(); do { ++BI; } while (isa<DbgInfoIntrinsic>(BI)); + if (&*BI == BCI) + // Also skip over the bitcast. + ++BI; if (&*BI != RI) return false; } else { |
