diff options
| author | Ekaterina Romanova <katya_romanova@playstation.sony.com> | 2014-03-13 18:47:12 +0000 |
|---|---|---|
| committer | Ekaterina Romanova <katya_romanova@playstation.sony.com> | 2014-03-13 18:47:12 +0000 |
| commit | ed2ca70ccff2e2654a41d6d9fc74683d6ec0a2ff (patch) | |
| tree | 829e06a09c999477f07347a446c8984787fa7865 /include | |
| parent | 4ad41871eba4ec8bfe5a967f596b85814fa5fe4b (diff) | |
| download | llvm-ed2ca70ccff2e2654a41d6d9fc74683d6ec0a2ff.tar.gz llvm-ed2ca70ccff2e2654a41d6d9fc74683d6ec0a2ff.tar.bz2 llvm-ed2ca70ccff2e2654a41d6d9fc74683d6ec0a2ff.tar.xz | |
Fix for http://llvm.org/bugs/show_bug.cgi?id=18590
This patch fixes the bug in peephole optimization that folds a load which defines one vreg into the one and only use of that vreg. With debug info, a DBG_VALUE that referenced the vreg considered to be a use, preventing the optimization. The fix is to ignore DBG_VALUE's during the optimization, and undef a DBG_VALUE that references a vreg that gets removed.
Patch by Trevor Smigiel!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203829 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/CodeGen/MachineRegisterInfo.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h index ecaaf0a068..01fa00fe24 100644 --- a/include/llvm/CodeGen/MachineRegisterInfo.h +++ b/include/llvm/CodeGen/MachineRegisterInfo.h @@ -510,6 +510,10 @@ public: return Hint.first ? 0 : Hint.second; } + /// markUsesInDebugValueAsUndef - Mark every DBG_VALUE referencing the + /// specified register as undefined which causes the DBG_VALUE to be + /// deleted during LiveDebugVariables analysis. + void markUsesInDebugValueAsUndef(unsigned Reg) const; //===--------------------------------------------------------------------===// // Physical Register Use Info |