Chris Lattner 26d2990e03 Lower X%C into X/C+stuff. This allows the 'division by a constant' logic to ... apply to rems as well as divs. This fixes PR945 and speeds up ReedSolomon from 14.57s to 10.90s (which is now faster than gcc). It compiles CodeGen/X86/rem.ll into: _test1: subl $4, %esp movl %esi, (%esp) movl $2155905153, %ecx movl 8(%esp), %esi movl %esi, %eax imull %ecx addl %esi, %edx movl %edx, %eax shrl $31, %eax sarl $7, %edx addl %eax, %edx imull $255, %edx, %eax subl %eax, %esi movl %esi, %eax movl (%esp), %esi addl $4, %esp ret _test2: movl 4(%esp), %eax movl %eax, %ecx sarl $31, %ecx shrl $24, %ecx addl %eax, %ecx andl $4294967040, %ecx subl %ecx, %eax ret _test3: subl $4, %esp movl %esi, (%esp) movl $2155905153, %ecx movl 8(%esp), %esi movl %esi, %eax mull %ecx shrl $7, %edx imull $255, %edx, %eax subl %eax, %esi movl %esi, %eax movl (%esp), %esi addl $4, %esp ret instead of div/idiv instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30920 91177308-0d34-0410-b5e6-96231b3b80d8		2006-10-12 20:58:32 +00:00
..
DAGCombiner.cpp	Lower X%C into X/C+stuff. This allows the 'division by a constant' logic to	2006-10-12 20:58:32 +00:00
LegalizeDAG.cpp	Typo	2006-10-11 17:52:19 +00:00
Makefile	For PR780:	2006-07-26 16:18:00 +00:00
ScheduleDAG.cpp	Added support for machine specific constantpool values. These are useful for	2006-09-12 21:00:35 +00:00
ScheduleDAGList.cpp	s|llvm/Support/Visibility.h|llvm/Support/Compiler.h|	2006-08-27 12:54:02 +00:00
ScheduleDAGRRList.cpp	s|llvm/Support/Visibility.h|llvm/Support/Compiler.h|	2006-08-27 12:54:02 +00:00
ScheduleDAGSimple.cpp	s|llvm/Support/Visibility.h|llvm/Support/Compiler.h|	2006-08-27 12:54:02 +00:00
SelectionDAG.cpp	Add RemoveDeadNode to remove a dead node and its (potentially) dead operands.	2006-10-12 20:34:05 +00:00
SelectionDAGCSEMap.cpp	Added support for machine specific constantpool values. These are useful for	2006-09-12 21:00:35 +00:00
SelectionDAGISel.cpp	Jimptables working again on alpha.	2006-10-11 04:29:42 +00:00
SelectionDAGPrinter.cpp	Naming consistency.	2006-10-11 07:10:22 +00:00
TargetLowering.cpp	Naming consistency.	2006-10-11 07:10:22 +00:00