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df14a04b5c
llvm-6502/lib
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Chris Lattner df14a04b5c Fix a problem that Nate noticed with LSR: 
When inserting code for an addrec expression with a non-unit stride, be
more careful where we insert the multiply.  In particular, insert the multiply
in the outermost loop we can, instead of the requested insertion point.

This allows LSR to notice the mul in the right loop, reducing it when it gets
to it.  This allows it to reduce the multiply, where before it missed it.

This happens quite a bit in the test suite, for example, eliminating 2
multiplies in art, 3 in ammp, 4 in apsi, reducing from 1050 multiplies to
910 muls in galgel (!), from 877 to 859 in applu, and 36 to 30 in bzip2.

This speeds up galgel from 16.45s to 16.01s, applu from 14.21 to 13.94s and
fourinarow from 66.67s to 63.48s.

This implements Transforms/LoopStrengthReduce/nested-reduce.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24102 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-30 06:24:33 +00:00
..
Analysis Fix a problem that Nate noticed with LSR: 2005-10-30 06:24:33 +00:00
Archive DONT_BUILD_RELINKED is gone and implied by BUILD_ARCHIVE now 2005-10-24 02:26:13 +00:00
AsmParser When a function takes a variable number of pointer arguments, with a zero 2005-10-23 04:37:20 +00:00
Bytecode DONT_BUILD_RELINKED is gone and implied by BUILD_ARCHIVE now 2005-10-24 02:26:13 +00:00
CodeGen Fix DSE to not nuke dead stores unless they redundant store is the same 2005-10-27 07:10:34 +00:00
Debugger When a function takes a variable number of pointer arguments, with a zero 2005-10-23 04:37:20 +00:00
ExecutionEngine Fix a nasty bug that was causing miscompilation of global variables 2005-10-23 23:54:56 +00:00
Linker DONT_BUILD_RELINKED is gone and implied by BUILD_ARCHIVE now 2005-10-24 02:26:13 +00:00
Support DONT_BUILD_RELINKED is gone and implied by BUILD_ARCHIVE now 2005-10-24 02:26:13 +00:00
System DONT_BUILD_RELINKED is gone and implied by BUILD_ARCHIVE now 2005-10-24 02:26:13 +00:00
Target Make -time-passes output prettier 2005-10-29 16:45:02 +00:00
Transforms This pass is now obsolete since all targets have moved to the SelectionDAG 2005-10-29 05:33:46 +00:00
VMCore Allow $ 2005-10-14 01:28:34 +00:00
Makefile