Chris Lattner 0ea26ca45b Expand 64-bit shifts more optimally if we know that the high bit of the ... shift amount is one or zero. For example, for: long long foo1(long long X, int C) { return X << (C|32); } long long foo2(long long X, int C) { return X << (C&~32); } we get: _foo1: movb $31, %cl movl 4(%esp), %edx andb 12(%esp), %cl shll %cl, %edx xorl %eax, %eax ret _foo2: movb $223, %cl movl 4(%esp), %eax movl 8(%esp), %edx andb 12(%esp), %cl shldl %cl, %eax, %edx shll %cl, %eax ret instead of: _foo1: subl $4, %esp movl %ebx, (%esp) movb $32, %bl movl 8(%esp), %eax movl 12(%esp), %edx movb %bl, %cl orb 16(%esp), %cl shldl %cl, %eax, %edx shll %cl, %eax xorl %ecx, %ecx testb %bl, %bl cmovne %eax, %edx cmovne %ecx, %eax movl (%esp), %ebx addl $4, %esp ret _foo2: subl $4, %esp movl %ebx, (%esp) movb $223, %cl movl 8(%esp), %eax movl 12(%esp), %edx andb 16(%esp), %cl shldl %cl, %eax, %edx shll %cl, %eax xorl %ecx, %ecx xorb %bl, %bl testb %bl, %bl cmovne %eax, %edx cmovne %ecx, %eax movl (%esp), %ebx addl $4, %esp ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30506 91177308-0d34-0410-b5e6-96231b3b80d8		2006-09-20 03:38:48 +00:00
..
DAGCombiner.cpp	Fold (X & C1) | (Y & C2) -> (X|Y) & C3 when possible.	2006-09-14 21:11:37 +00:00
LegalizeDAG.cpp	Expand 64-bit shifts more optimally if we know that the high bit of the	2006-09-20 03:38:48 +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	Fold extract_element(cst) to cst	2006-09-19 05:02:39 +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	absolute addresses must match pointer size	2006-09-18 17:59:35 +00:00
SelectionDAGPrinter.cpp	Added support for machine specific constantpool values. These are useful for	2006-09-12 21:00:35 +00:00
TargetLowering.cpp	Change the default to 0, which means 'default'.	2006-09-05 17:39:15 +00:00