Chris Lattner cfa0f2edd3 Make the 2-address instruction lowering pass smarter in two ways: ... 1. If we are two-addressing a commutable instruction and the LHS is not the last use of the variable, see if the instruction is the last use of the RHS. If so, commute the instruction, allowing us to avoid a register-register copy in many cases for common instructions like ADD, OR, AND, etc on X86. 2. If #1 doesn't hold, and if this is an instruction that also existing in 3-address form, promote the instruction to a 3-address instruction to avoid the register-register copy. We can do this for several common instructions in X86, including ADDrr, INC, DEC, etc. This patch implements test/Regression/CodeGen/X86/commute-two-addr.ll, overlap-add.ll, and overlap-shift.ll when I check in the X86 support for it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19245 91177308-0d34-0410-b5e6-96231b3b80d8		2005-01-02 02:34:12 +00:00
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Analysis	Wrap at 80 cols	2004-12-23 21:17:41 +00:00
Archive	Remove potential platform portability issue with size of "int".	2004-12-29 01:20:24 +00:00
AsmParser	Do not allow empty label names.	2004-12-10 05:40:19 +00:00
Bytecode	Remove potential platform portability issue with size of "int".	2004-12-29 01:20:24 +00:00
CodeGen	Make the 2-address instruction lowering pass smarter in two ways:	2005-01-02 02:34:12 +00:00
Debugger	Correct the comments and file header.	2004-12-23 21:16:46 +00:00
ExecutionEngine	Be double sure about including sys/stat.h by wrapping the inclusion in	2004-12-20 06:34:02 +00:00
Linker	Remove un-needed #includes.	2004-12-20 04:15:44 +00:00
Support	Make printing a warning message optional in CheckBytecodeOutputToConsole.	2005-01-02 00:10:03 +00:00
System	Add functions for determining if the stdin/out/err is connected to a	2005-01-01 22:54:05 +00:00
Target	Add some bits that can be set for instructions.	2005-01-02 02:27:48 +00:00
Transforms	This is a bulk commit that implements the following primary improvements:	2005-01-01 16:22:27 +00:00
VMCore	Allow getZeroExtend and getSignExtend to work with boolean inputs.	2005-01-01 15:59:57 +00:00
Makefile	Add the Linker library	2004-11-14 21:54:41 +00:00