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LSR: rewrite inner loops only.

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Rewriting the entire loop nest now requires -enable-lsr-nested.
See PR11035 for some performance data.
A few unit tests specifically test nested LSR, and are now under a flag.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140762 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-09-29 01:33:38 +00:00
parent 03b08764d2
commit 0c01bc385a
7 changed files with 45 additions and 14 deletions
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4
test/CodeGen/X86/loop-strength-reduce3.ll
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@@ -1,5 +1,5 @@
; RUN: llc < %s -march=x86 | grep cmp | grep 240
; RUN: llc < %s -march=x86 | grep inc | count 1
; RUN: llc < %s -march=x86 -enable-lsr-nested | grep cmp | grep 240
; RUN: llc < %s -march=x86 -enable-lsr-nested | grep inc | count 1
define i32 @foo(i32 %A, i32 %B, i32 %C, i32 %D) nounwind {
entry: