Chris Lattner dac54ebbee Improve signed division by power of 2 *dramatically* from this: ... div: mov %EDX, DWORD PTR [%ESP + 4] mov %ECX, 64 mov %EAX, %EDX sar %EDX, 31 idiv %ECX ret to this: div: mov %EAX, DWORD PTR [%ESP + 4] mov %ECX, %EAX sar %ECX, 5 shr %ECX, 26 mov %EDX, %EAX add %EDX, %ECX sar %EAX, 6 ret Note that the intel compiler is currently making this: div: movl 4(%esp), %edx #3.5 movl %edx, %eax #4.14 sarl $5, %eax #4.14 shrl $26, %eax #4.14 addl %edx, %eax #4.14 sarl $6, %eax #4.14 ret #4.14 Which has one less register->register copy. (hint hint alkis :) llvm-svn: 13354		2004-05-04 19:33:58 +00:00
..
CBackend	Changes to fix up the inst_iterator to pass to boost iterator checks. This	2004-04-27 15:13:33 +00:00
PowerPC
SparcV8	I don't think we have to have 4 extra allocated (but unused) bytes on the stack.	2004-04-13 18:28:37 +00:00
SparcV9	Integrate the rest of my random sparcv9 scribblings into this file	2004-04-27 22:04:03 +00:00
X86	Improve signed division by power of 2 *dramatically* from this:	2004-05-04 19:33:58 +00:00
Makefile
MRegisterInfo.cpp
Target.td
TargetData.cpp	Fix typo.	2004-04-14 21:21:56 +00:00
TargetFrameInfo.cpp
TargetInstrInfo.cpp
TargetMachine.cpp
TargetSchedInfo.cpp	Add a constructor that got lost	2004-05-01 11:17:13 +00:00