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Fix for http://llvm.org/bugs/show_bug.cgi?id=18590

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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
This commit is contained in:
Ekaterina Romanova
2014-03-13 18:47:12 +00:00
parent 4ad41871eb
commit ed2ca70ccf
5 changed files with 114 additions and 14 deletions
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4
include/llvm/CodeGen/MachineRegisterInfo.h
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@@ -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