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author | Chris Lattner <sabre@nondot.org> | 2008-11-26 02:54:17 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2008-11-26 02:54:17 +0000 |
commit | c5dd22a3338e089a75ad4a1c2b5cc120a82f9f77 (patch) | |
tree | 7312fe6610bb05f69aba96398667a5434f299d52 /lib | |
parent | ad2b173f9bef5ba304c9e3fc906f6a335e366bd2 (diff) | |
download | external_llvm-c5dd22a3338e089a75ad4a1c2b5cc120a82f9f77.zip external_llvm-c5dd22a3338e089a75ad4a1c2b5cc120a82f9f77.tar.gz external_llvm-c5dd22a3338e089a75ad4a1c2b5cc120a82f9f77.tar.bz2 |
add a long-overdue AllocaInst::isStaticAlloca method.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60080 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
-rw-r--r-- | lib/VMCore/Instructions.cpp | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp index 66caf5f..5b271d6 100644 --- a/lib/VMCore/Instructions.cpp +++ b/lib/VMCore/Instructions.cpp @@ -732,6 +732,18 @@ AllocaInst::AllocaInst(const AllocaInst &AI) Instruction::Alloca, AI.getAlignment()) { } +/// isStaticAlloca - Return true if this alloca is in the entry block of the +/// function and is a constant size. If so, the code generator will fold it +/// into the prolog/epilog code, so it is basically free. +bool AllocaInst::isStaticAlloca() const { + // Must be constant size. + if (!isa<ConstantInt>(getArraySize())) return false; + + // Must be in the entry block. + const BasicBlock *Parent = getParent(); + return Parent == &Parent->getParent()->front(); +} + MallocInst::MallocInst(const MallocInst &MI) : AllocationInst(MI.getType()->getElementType(), (Value*)MI.getOperand(0), Instruction::Malloc, MI.getAlignment()) { |