Chris Lattner a92ff91a96 implement enough of the memset inference algorithm to recognize and insert ... memsets. This is still missing one important validity check, but this is enough to compile stuff like this: void test0(std::vector<char> &X) { for (std::vector<char>::iterator I = X.begin(), E = X.end(); I != E; ++I) *I = 0; } void test1(std::vector<int> &X) { for (long i = 0, e = X.size(); i != e; ++i) X[i] = 0x01010101; } With: $ clang t.cpp -S -o - -O2 -emit-llvm | opt -loop-idiom | opt -O3 | llc to: __Z5test0RSt6vectorIcSaIcEE: ## @_Z5test0RSt6vectorIcSaIcEE ## BB#0: ## %entry subq $8, %rsp movq (%rdi), %rax movq 8(%rdi), %rsi cmpq %rsi, %rax je LBB0_2 ## BB#1: ## %bb.nph subq %rax, %rsi movq %rax, %rdi callq ___bzero LBB0_2: ## %for.end addq $8, %rsp ret ... __Z5test1RSt6vectorIiSaIiEE: ## @_Z5test1RSt6vectorIiSaIiEE ## BB#0: ## %entry subq $8, %rsp movq (%rdi), %rax movq 8(%rdi), %rdx subq %rax, %rdx cmpq $4, %rdx jb LBB1_2 ## BB#1: ## %for.body.preheader andq $-4, %rdx movl $1, %esi movq %rax, %rdi callq _memset LBB1_2: ## %for.end addq $8, %rsp ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122573 91177308-0d34-0410-b5e6-96231b3b80d8		2010-12-26 23:42:51 +00:00
..
ADT	Use IntEqClasses to compute connected components of live intervals.	2010-12-21 00:48:17 +00:00
Analysis	implement enough of the memset inference algorithm to recognize and insert	2010-12-26 23:42:51 +00:00
Assembly
Bitcode	Merge System into Support.	2010-11-29 18:16:10 +00:00
CodeGen	Header warning patrol.	2010-12-25 02:38:01 +00:00
CompilerDriver	Merge System into Support.	2010-11-29 18:16:10 +00:00
Config	Support/FileSystem: Fix MinGW build. It doesn't have _chsize_s.	2010-12-03 18:48:56 +00:00
ExecutionEngine	Merge System into Support.	2010-11-29 18:16:10 +00:00
MC	Add basic support for .cfi_personality.	2010-12-26 20:20:31 +00:00
Object	MC/Mach-O: Shuffle enums a bit to make it harder to inadvertently use the wrong	2010-12-21 15:26:45 +00:00
Support	add methods to IRBuilder to create memcpy/memset/memmove.	2010-12-26 22:49:25 +00:00
Target	Various bits of framework needed for precise machine-level selection	2010-12-24 05:03:26 +00:00
Transforms	Start of a pass for recognizing memset and memcpy idioms.	2010-12-26 19:32:44 +00:00
AbstractTypeUser.h
Argument.h
Attributes.h	Add a new 'hotpatch' attribute. This attribute will insert a two-byte no-op	2010-10-25 15:37:09 +00:00
AutoUpgrade.h	Auto-upgrade the magic ".llvm.eh.catch.all.value" global to	2010-09-10 18:51:56 +00:00
BasicBlock.h	Merge System into Support.	2010-11-29 18:16:10 +00:00
CallGraphSCCPass.h
CallingConv.h	Adding target specific calling conventions to support the MBlaze GCC function	2010-12-15 20:14:09 +00:00
CMakeLists.txt
Constant.h	Remove apparently unnecessary forward declaration.	2010-09-14 01:18:15 +00:00
Constants.h	clarify comment	2010-12-03 01:11:13 +00:00
DerivedTypes.h	Merge System into Support.	2010-11-29 18:16:10 +00:00
Function.h	Switch attribute macros to use 'LLVM_' as a prefix. We retain the old names	2010-10-23 08:10:43 +00:00
GlobalAlias.h
GlobalValue.h	Discourage people from using isWeakForLinker when they should be using	2010-12-20 10:57:01 +00:00
GlobalVariable.h	GlobalOpt: EvaluateFunction() must not evaluate stores to weak_odr globals.	2010-10-19 16:47:23 +00:00
GVMaterializer.h
InitializePasses.h	Start of a pass for recognizing memset and memcpy idioms.	2010-12-26 19:32:44 +00:00
InlineAsm.h	Mult-alt constraint incremental development step 3.	2010-10-29 23:37:38 +00:00
InstrTypes.h
Instruction.def
Instruction.h	There is no need for isAssociative to take the type as an argument anymore.	2010-12-20 13:10:23 +00:00
Instructions.h	Fix paste-o in ExtractValueInst::getIndexedType() comments.	2010-12-03 14:54:33 +00:00
IntrinsicInst.h	remove the pointless check of MemoryUseIntrinsic from	2010-11-30 02:03:47 +00:00
Intrinsics.h
Intrinsics.td	Make @llvm.invariant.start not be readonly, so that it has side-effects. This	2010-11-30 04:13:41 +00:00
IntrinsicsAlpha.td
IntrinsicsARM.td	Add Neon VCVT instructions for f32 <-> f16 conversions.	2010-12-15 22:14:12 +00:00
IntrinsicsCellSPU.td
IntrinsicsPowerPC.td
IntrinsicsX86.td	The pshufw instruction came about in MMX2 when SSE was introduced. Don't place	2010-10-04 20:24:01 +00:00
IntrinsicsXCore.td
LinkAllPasses.h	Start of a pass for recognizing memset and memcpy idioms.	2010-12-26 19:32:44 +00:00
LinkAllVMCore.h	Missed a spot removing Alarm.	2010-12-07 18:50:33 +00:00
Linker.h
LLVMContext.h	now that AsmPrinter::EmitInlineAsm is factored right, we can eliminate the	2010-11-17 08:13:01 +00:00
Metadata.h	After Dan's recent commit this is no longer true.	2010-09-14 20:32:58 +00:00
Module.h	Merge System into Support.	2010-11-29 18:16:10 +00:00
OperandTraits.h
Operator.h	Avoid warnings about implicit conversions to `bool' in MSVC. This time	2010-09-25 20:27:36 +00:00
Pass.h	Add RegionPass support.	2010-10-20 01:54:44 +00:00
PassAnalysisSupport.h
PassManager.h
PassManagers.h	Add RegionPass support.	2010-10-20 01:54:44 +00:00
PassRegistry.h	Attempt to fix valgrind complaining about (benign) leaks in pass registration by having PassRegistry	2010-10-20 22:22:30 +00:00
PassSupport.h	Merge System into Support.	2010-11-29 18:16:10 +00:00
SymbolTableListTraits.h
Type.h	Add x86MMX a few more places.	2010-09-15 00:52:23 +00:00
TypeSymbolTable.h	Merge System into Support.	2010-11-29 18:16:10 +00:00
Use.h
User.h
Value.h	Revert r122114 (CallbackVH observing use-list changes) because it caused severe slowdowns on the Linux self-host configuration.	2010-12-20 22:28:03 +00:00
ValueSymbolTable.h	Merge System into Support.	2010-11-29 18:16:10 +00:00