llvm-6502/lib/Transforms
Andrew Trick 64925c55c6 Enable LSR IV Chains with sufficient heuristics.
These heuristics are sufficient for enabling IV chains by
default. Performance analysis has been done for i386, x86_64, and
thumbv7. The optimization is rarely important, but can significantly
speed up certain cases by eliminating spill code within the
loop. Unrolled loops are prime candidates for IV chains. In many
cases, the final code could still be improved with more target
specific optimization following LSR. The goal of this feature is for
LSR to make the best choice of induction variables.

Instruction selection may not completely take advantage of this
feature yet. As a result, there could be cases of slight code size
increase.

Code size can be worse on x86 because it doesn't support postincrement
addressing. In fact, when chains are formed, you may see redundant
address plus stride addition in the addressing mode. GenerateIVChains
tries to compensate for the common cases.

On ARM, code size increase can be mitigated by using postincrement
addressing, but downstream codegen currently misses some opportunities.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147826 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-10 01:45:08 +00:00
..
Hello Since the Hello pass is built as a loadable dynamic library, don't try to convert it to new-style registration yet. 2010-10-07 00:31:16 +00:00
InstCombine Move assert to the right place. 2012-01-09 17:36:29 +00:00
Instrumentation [asan] cleanup: remove the SIGILL-related code (compiler part) 2012-01-06 18:09:21 +00:00
IPO PR11705, part 2: globalopt shouldn't put inttoptr/ptrtoint operations into global initializers if there's an implied extension or truncation. 2012-01-05 23:03:32 +00:00
Scalar Enable LSR IV Chains with sufficient heuristics. 2012-01-10 01:45:08 +00:00
Utils Fix SpeculativelyExecuteBB to either speculate all or none of the phis 2012-01-05 23:58:56 +00:00
CMakeLists.txt Move library stuff out of the toplevel CMakeLists.txt file. 2011-02-18 22:06:14 +00:00
LLVMBuild.txt LLVMBuild: Introduce a common section which currently has a list of the 2011-12-12 22:45:54 +00:00
Makefile