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Unit test for r146950: LSR postinc expansion, PR11571.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146951 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-12-20 01:43:20 +00:00
parent ba3c0bc364
commit 1885687462
1 changed files with 39 additions and 0 deletions
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test/Transforms/LoopStrengthReduce/2011-12-19-PostincQuadratic.ll Normal file
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; RUN: opt -loop-reduce -S < %s | FileCheck %s
;
; PR11571: handle a postinc user outside of for.body7 that requires
; recursive expansion of a quadratic recurrence within for.body7. LSR
; needs to forget that for.body7 is a postinc loop during expansion.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S128"
target triple = "i386-unknown-freebsd10.0"
@b = external global [121 x i32]
; CHECK: @vb
; Outer recurrence:
; CHECK: %lsr.iv1 = phi [121 x i32]*
; Inner recurrence:
; CHECK: %lsr.iv = phi i32
; Outer step (relative to inner recurrence):
; CHECK: %scevgep = getelementptr i1* %{{.*}}, i32 %lsr.iv
; Outer use:
; CHECK: %lsr.iv3 = phi [121 x i32]* [ %lsr.iv1, %for.body43.preheader ]
define void @vb() nounwind {
for.cond.preheader:
br label %for.body7
for.body7:
%indvars.iv77 = phi i32 [ %indvars.iv.next78, %for.body7 ], [ 1, %for.cond.preheader ]
%bf.072 = phi i32 [ %t1, %for.body7 ], [ 0, %for.cond.preheader ]
%t1 = add i32 %bf.072, %indvars.iv77
%indvars.iv.next78 = add i32 %indvars.iv77, 1
br i1 undef, label %for.body43, label %for.body7
for.body43:
%bf.459 = phi i32 [ %inc44, %for.body43 ], [ %t1, %for.body7 ]
%inc44 = add nsw i32 %bf.459, 1
%arrayidx45 = getelementptr inbounds [121 x i32]* @b, i32 0, i32 %bf.459
%t2 = load i32* %arrayidx45, align 4
br label %for.body43
}