llvm-6502/lib/Transforms/InstCombine
Quentin Colombet 637582eaf7 When code size is the priority (Oz, MinSize attribute), help llvm
turning a code like this:

if (foo)
   free(foo)

into that:
free(foo)

Move a call to free from basic block FB into FB's predecessor, P,
when the path from P to FB is taken only if the argument of free is
not equal to NULL.

Some restrictions apply on P and FB to be sure that this code motion
is profitable. Namely:
1. FB must have only one predecessor P.
2. FB must contain only the call to free plus an unconditional
   branch to S.
3. P's successors are FB and S.

Because of 1., we will not increase the code size when moving the call
to free from FB to P.
Because of 2., FB will be empty after the move.
Because of 2. and 3., P's branch instruction becomes useless, so as FB
(simplifycfg will do the job).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171762 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-07 18:37:41 +00:00
..
CMakeLists.txt
InstCombine.h When code size is the priority (Oz, MinSize attribute), help llvm 2013-01-07 18:37:41 +00:00
InstCombineAddSub.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombineAndOrXor.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombineCalls.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombineCasts.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombineCompares.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombineLoadStoreAlloca.cpp switch from pointer equality comparison to MDNode::getMostGenericTBAA 2013-01-05 16:44:07 +00:00
InstCombineMulDivRem.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombinePHI.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombineSelect.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
InstCombineShifts.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombineSimplifyDemanded.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstCombineVectorOps.cpp [InstCombine] Teach InstCombine how to handle an obfuscated splat. 2012-10-16 21:29:38 +00:00
InstCombineWorklist.h Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstructionCombining.cpp When code size is the priority (Oz, MinSize attribute), help llvm 2013-01-07 18:37:41 +00:00
LLVMBuild.txt
Makefile