Chris Lattner 570751c2a7 Fold code like: ... if (C) V1 |= V2; into: Vx = V1 | V2; V1 = select C, V1, Vx when the expression can be evaluated unconditionally and is *cheap* to execute. This limited form of if conversion is quite handy in lots of cases. For example, it turns this testcase into straight-line code: int in0 ; int in1 ; int in2 ; int in3 ; int in4 ; int in5 ; int in6 ; int in7 ; int in8 ; int in9 ; int in10; int in11; int in12; int in13; int in14; int in15; long output; void mux(void) { output = (in0 ? 0x00000001 : 0) | (in1 ? 0x00000002 : 0) | (in2 ? 0x00000004 : 0) | (in3 ? 0x00000008 : 0) | (in4 ? 0x00000010 : 0) | (in5 ? 0x00000020 : 0) | (in6 ? 0x00000040 : 0) | (in7 ? 0x00000080 : 0) | (in8 ? 0x00000100 : 0) | (in9 ? 0x00000200 : 0) | (in10 ? 0x00000400 : 0) | (in11 ? 0x00000800 : 0) | (in12 ? 0x00001000 : 0) | (in13 ? 0x00002000 : 0) | (in14 ? 0x00004000 : 0) | (in15 ? 0x00008000 : 0) ; } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12798 91177308-0d34-0410-b5e6-96231b3b80d8		2004-04-09 22:50:22 +00:00
..
BasicBlockUtils.cpp
BreakCriticalEdges.cpp	Fix bug: test/Regression/Transforms/LowerInvoke/2004-02-29-PHICrash.llx	2004-02-29 22:24:41 +00:00
CloneFunction.cpp	Minor speedup, don't query ValueMap each time through the loop	2004-02-04 21:44:26 +00:00
CloneModule.cpp
CloneTrace.cpp	Give CloneBasicBlock an optional function argument to specify which function	2004-02-04 01:19:43 +00:00
CodeExtractor.cpp	Fix bug: CodeExtractor/2004-03-17-MissedLiveIns.ll	2004-03-18 05:56:32 +00:00
DemoteRegToStack.cpp	Fix PR310 and TailDup/2004-04-01-DemoteRegToStack.llx	2004-04-01 20:28:45 +00:00
InlineFunction.cpp	Fix compilation of 126.gcc: intrinsic functions cannot throw, so they are not	2004-02-13 16:47:35 +00:00
Linker.cpp	Fix linking of constant expr casts due to type resolution changes. With	2004-03-31 02:58:28 +00:00
Local.cpp	Add constant folding wrapper support for select instructions.	2004-03-12 05:53:03 +00:00
LoopSimplify.cpp	Remove some assertions that are now bogus with the last patch I put in	2004-04-01 19:21:46 +00:00
LowerAllocations.cpp	Don't emit things like malloc(16*1). Allocation instructions are fixed arity now.	2004-03-03 01:40:53 +00:00
LowerInvoke.cpp	Support getelementptr instructions which use uint's to index into structure	2004-04-05 01:30:19 +00:00
LowerSelect.cpp	Add a simple select instruction lowering pass	2004-03-30 18:41:10 +00:00
LowerSwitch.cpp	Do not create empty basic blocks when the lowerswitch pass expects blocks to	2004-03-14 04:14:31 +00:00
Makefile
Mem2Reg.cpp
PromoteMemoryToRegister.cpp	Implement ScalarRepl/select_promote.ll	2004-04-08 19:59:34 +00:00
SimplifyCFG.cpp	Fold code like:	2004-04-09 22:50:22 +00:00
UnifyFunctionExitNodes.cpp
ValueMapper.cpp	Adjustments to support the new ConstantAggregateZero class	2004-02-15 05:55:15 +00:00
ValueMapper.h