Chris Lattner beac75da37 implement rdar://6653118 - fastisel should fold loads where possible. ... Since mem2reg isn't run at -O0, we get a ton of reloads from the stack, for example, before, this code: int foo(int x, int y, int z) { return x+y+z; } used to compile into: _foo: ## @foo subq $12, %rsp movl %edi, 8(%rsp) movl %esi, 4(%rsp) movl %edx, (%rsp) movl 8(%rsp), %edx movl 4(%rsp), %esi addl %edx, %esi movl (%rsp), %edx addl %esi, %edx movl %edx, %eax addq $12, %rsp ret Now we produce: _foo: ## @foo subq $12, %rsp movl %edi, 8(%rsp) movl %esi, 4(%rsp) movl %edx, (%rsp) movl 8(%rsp), %edx addl 4(%rsp), %edx ## Folded load addl (%rsp), %edx ## Folded load movl %edx, %eax addq $12, %rsp ret Fewer instructions and less register use = faster compiles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113102 91177308-0d34-0410-b5e6-96231b3b80d8		2010-09-05 02:18:34 +00:00
..
CMakeLists.txt	Move CallingConvLower.cpp out of the SelectionDAG directory.	2010-07-07 15:15:27 +00:00
DAGCombiner.cpp	Don't narrow the load and store in a load+twiddle+store sequence unless	2010-09-02 21:18:42 +00:00
FastISel.cpp	Fix typo.	2010-08-17 01:30:33 +00:00
FunctionLoweringInfo.cpp	Reapply r112623. Included additional check for unused byval argument.	2010-08-31 22:22:42 +00:00
InstrEmitter.cpp	Revert r112461. It was failing on PPC...	2010-08-30 04:36:50 +00:00
InstrEmitter.h	Don't set kill flags for instructions which the scheduler has cloned.	2010-05-14 22:01:14 +00:00
LegalizeDAG.cpp	Add a missing check when legalizing a vector extending load. This doesn't	2010-09-03 19:20:37 +00:00
LegalizeFloatTypes.cpp	Convert some tab stops into spaces.	2010-07-12 08:16:59 +00:00
LegalizeIntegerTypes.cpp	80-col.	2010-07-23 01:05:59 +00:00
LegalizeTypes.cpp	Use A.append(...) instead of A.insert(A.end(), ...) when A is a	2010-06-21 19:47:52 +00:00
LegalizeTypes.h	implement SplitVecOp_CONCAT_VECTORS, fixing the included testcase with SSE1.	2010-08-26 05:51:22 +00:00
LegalizeTypesGeneric.cpp	Fix va_arg for doubles. With this patch VAARG nodes always contain the	2010-07-11 04:01:49 +00:00
LegalizeVectorOps.cpp	Change UpdateNodeOperands' operand and return value from SDValue to	2010-06-18 15:30:29 +00:00
LegalizeVectorTypes.cpp	implement SplitVecOp_CONCAT_VECTORS, fixing the included testcase with SSE1.	2010-08-26 05:51:22 +00:00
Makefile	make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.	2010-01-24 20:43:08 +00:00
ScheduleDAGFast.cpp	Make fast scheduler handle asm clobbers correctly.	2010-08-17 22:17:24 +00:00
ScheduleDAGList.cpp	Trim #include.	2010-05-26 00:55:59 +00:00
ScheduleDAGRRList.cpp	The "excess register pressure" returned by HighRegPressure() is not accurate enough to factor into scheduling priority. Eliminate it and add early exits to speed up scheduling.	2010-07-26 21:49:07 +00:00
ScheduleDAGSDNodes.cpp	Add missing null check reported by Amaury Pouly.	2010-08-10 02:39:45 +00:00
ScheduleDAGSDNodes.h	Code refactoring, no functionality changes.	2010-06-10 02:09:31 +00:00
SDNodeDbgValue.h	Add const qualifiers to CodeGen's use of LLVM IR constructs.	2010-04-15 01:51:59 +00:00
SDNodeOrdering.h	Allow 0 as an order number. Don't assign an order to formal arguments.	2009-12-22 21:35:02 +00:00
SelectionDAG.cpp	zap unused method. x86 is the only user and already has a more powerfull version	2010-08-31 02:36:20 +00:00
SelectionDAGBuilder.cpp	Detect undef value early and save unnecessary NodeMap query.	2010-09-02 21:29:42 +00:00
SelectionDAGBuilder.h	Offset is not always unsigned number.	2010-08-31 06:12:08 +00:00
SelectionDAGISel.cpp	implement rdar://6653118 - fastisel should fold loads where possible.	2010-09-05 02:18:34 +00:00
SelectionDAGPrinter.cpp	Eliminate unnecessary empty string literals.	2010-08-04 01:39:08 +00:00
TargetLowering.cpp	remove some llvmcontext arguments that are now dead post-refactoring.	2010-08-25 23:00:45 +00:00
TargetSelectionDAGInfo.cpp	Implement a bunch more TargetSelectionDAGInfo infrastructure.	2010-05-11 17:31:57 +00:00