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Generalize OptimizeLoopTermCond to optimize more loop terminating icmp to use postinc iv.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89116 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-11-17 18:10:11 +00:00
parent 37d60fd142
commit 076e085698
2 changed files with 131 additions and 92 deletions
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27
test/Transforms/LoopStrengthReduce/icmp_use_postinc.ll Normal file
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@@ -0,0 +1,27 @@
; RUN: opt < %s -loop-reduce -S | FileCheck %s
define i32 @main(i32 %argc, i8** nocapture %argv) nounwind ssp {
entry:
br i1 undef, label %bb4.preheader, label %bb.nph8
bb4.preheader: ; preds = %entry
br label %bb4
bb1: ; preds = %bb4
br i1 undef, label %bb.nph8, label %bb3
bb3: ; preds = %bb1
%phitmp = add i32 %indvar, 1 ; <i32> [#uses=1]
br label %bb4
bb4: ; preds = %bb3, %bb4.preheader
; CHECK: %lsr.iv = phi
; CHECK: %lsr.iv.next = add i32 %lsr.iv, 1
; CHECK: %0 = icmp slt i32 %lsr.iv.next, %argc
%indvar = phi i32 [ 1, %bb4.preheader ], [ %phitmp, %bb3 ] ; <i32> [#uses=2]
%0 = icmp slt i32 %indvar, %argc ; <i1> [#uses=1]
br i1 %0, label %bb1, label %bb.nph8
bb.nph8: ; preds = %bb4, %bb1, %entry
unreachable
}