Benjamin Kramer 8c06aa1c59 Lower the i8 extension in memset to a multiply instead of a potentially long series of shifts and ors. ... We could implement a DAGCombine to turn x * 0x0101 back into logic operations on targets that doesn't support the multiply or it is slow (p4) if someone cares enough. Example code: void test(char *s, int a) { __builtin_memset(s, a, 4); } before: _test: ## @test movzbl 8(%esp), %eax movl %eax, %ecx shll $8, %ecx orl %eax, %ecx movl %ecx, %eax shll $16, %eax orl %ecx, %eax movl 4(%esp), %ecx movl %eax, 4(%ecx) movl %eax, (%ecx) ret after: _test: ## @test movzbl 8(%esp), %eax imull $16843009, %eax, %eax ## imm = 0x1010101 movl 4(%esp), %ecx movl %eax, 4(%ecx) movl %eax, (%ecx) ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122707 91177308-0d34-0410-b5e6-96231b3b80d8		2011-01-02 19:44:58 +00:00
..
CMakeLists.txt	Removed a bunch of unnecessary target_link_libraries.	2010-09-28 22:39:14 +00:00
DAGCombiner.cpp	DAGCombine add (sext i1), X into sub X, (zext i1) if sext from i1 is illegal. The latter usually compiles into smaller code.	2010-12-22 23:17:45 +00:00
FastISel.cpp	If dbg_declare() or dbg_value() is not lowered by isel then emit DEBUG message instead of creating DBG_VALUE for undefined value in reg0.	2010-12-06 22:39:26 +00:00
FunctionLoweringInfo.cpp	Reapply r112623. Included additional check for unused byval argument.	2010-08-31 22:22:42 +00:00
InstrEmitter.cpp	flags -> glue for selectiondag	2010-12-23 17:24:32 +00:00
InstrEmitter.h
LegalizeDAG.cpp	Fix indentation, add comment.	2010-12-21 17:16:58 +00:00
LegalizeFloatTypes.cpp	PR5207: Rename overloaded APInt methods set(), clear(), flip() to	2010-12-01 08:53:58 +00:00
LegalizeIntegerTypes.cpp	rename MVT::Flag to MVT::Glue. "Flag" is a terrible name for	2010-12-21 02:38:05 +00:00
LegalizeTypes.cpp	Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.	2010-11-23 03:31:01 +00:00
LegalizeTypes.h	Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.	2010-11-23 03:31:01 +00:00
LegalizeTypesGeneric.cpp	Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.	2010-11-23 03:31:01 +00:00
LegalizeVectorOps.cpp	Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.	2010-11-23 03:31:01 +00:00
LegalizeVectorTypes.cpp	Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.	2010-11-23 03:31:01 +00:00
Makefile
ScheduleDAGFast.cpp	flags -> glue for selectiondag	2010-12-23 17:24:32 +00:00
ScheduleDAGList.cpp	Various bits of framework needed for precise machine-level selection	2010-12-24 05:03:26 +00:00
ScheduleDAGRRList.cpp	Minor cleanup related to my latest scheduler changes.	2010-12-24 07:10:19 +00:00
ScheduleDAGSDNodes.cpp	flags -> glue for selectiondag	2010-12-23 17:24:32 +00:00
ScheduleDAGSDNodes.h	rename MVT::Flag to MVT::Glue. "Flag" is a terrible name for	2010-12-21 02:38:05 +00:00
SDNodeDbgValue.h	Merge System into Support.	2010-11-29 18:16:10 +00:00
SDNodeOrdering.h
SelectionDAG.cpp	Lower the i8 extension in memset to a multiply instead of a potentially long series of shifts and ors.	2011-01-02 19:44:58 +00:00
SelectionDAGBuilder.cpp	rename MVT::Flag to MVT::Glue. "Flag" is a terrible name for	2010-12-21 02:38:05 +00:00
SelectionDAGBuilder.h	When isel is emitting instructions for an x86 target without CMOV, the CFG is	2010-09-30 19:44:31 +00:00
SelectionDAGISel.cpp	Various bits of framework needed for precise machine-level selection	2010-12-24 05:03:26 +00:00
SelectionDAGPrinter.cpp	flags -> glue for selectiondag	2010-12-23 17:24:32 +00:00
TargetLowering.cpp	Add missing standard headers. Patch by Joerg Sonnenberger!	2010-12-19 20:43:38 +00:00
TargetSelectionDAGInfo.cpp