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Reapply the new LoopStrengthReduction code, with compile time and

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bug fixes, and with improved heuristics for analyzing foreign-loop
addrecs.

This change also flattens IVUsers, eliminating the stride-oriented
groupings, which makes it easier to work with.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95975 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-02-12 10:34:29 +00:00
parent 5cef638855
commit 572645cf84
35 changed files with 3523 additions and 2689 deletions
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18
test/CodeGen/X86/loop-strength-reduce4.ll
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@@ -1,5 +1,19 @@
; RUN: llc < %s -march=x86 | grep cmp | grep 64
; RUN: llc < %s -march=x86 | not grep inc
; RUN: llc < %s -march=x86 -relocation-model=static -mtriple=i686-apple-darwin | FileCheck %s -check-prefix=STATIC
; RUN: llc < %s -march=x86 -relocation-model=pic | FileCheck %s -check-prefix=PIC
; By starting the IV at -64 instead of 0, a cmp is eliminated,
; as the flags from the add can be used directly.
; STATIC: movl $-64, %ecx
; STATIC: movl %eax, _state+76(%ecx)
; STATIC: addl $16, %ecx
; STATIC: jne
; In PIC mode the symbol can't be folded, so the change-compare-stride
; trick applies.
; PIC: cmpl $64
@state = external global [0 x i32] ; <[0 x i32]*> [#uses=4]
@S = external global [0 x i32] ; <[0 x i32]*> [#uses=4]