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[LSR] Add llc testcase for r207271/r207569.

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See PR19608 for the details but to summarize it was easy to modify the .ll
file to get the desired def-use ordering.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207887 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adam Nemet 2014-05-02 23:49:01 +00:00
parent 10c37a012e
commit 3aa9b4911c
1 changed files with 70 additions and 0 deletions
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70
test/Transforms/LoopStrengthReduce/ARM64/req-regs.ll Normal file
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@ -0,0 +1,70 @@
; RUN: llc -mcpu=cyclone -debug-only=loop-reduce < %s 2>&1 | FileCheck %s
; REQUIRES: asserts
; LSR used to fail here due to a bug in the ReqRegs test.
; CHECK: The chosen solution requires
; CHECK-NOT: No Satisfactory Solution
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-ios"
define void @do_integer_add(i64 %iterations, i8* nocapture readonly %cookie) {
entry:
%N = bitcast i8* %cookie to i32*
%0 = load i32* %N, align 4
%add = add nsw i32 %0, 57
%cmp56 = icmp eq i64 %iterations, 0
br i1 %cmp56, label %while.end, label %for.cond.preheader.preheader
for.cond.preheader.preheader: ; preds = %entry
br label %for.cond.preheader
while.cond.loopexit: ; preds = %for.body
%add21.lcssa = phi i32 [ %add21, %for.body ]
%dec58 = add i64 %dec58.in, -1
%cmp = icmp eq i64 %dec58, 0
br i1 %cmp, label %while.end.loopexit, label %for.cond.preheader
for.cond.preheader: ; preds = %for.cond.preheader.preheader, %while.cond.loopexit
%dec58.in = phi i64 [ %dec58, %while.cond.loopexit ], [ %iterations, %for.cond.preheader.preheader ]
%a.057 = phi i32 [ %add21.lcssa, %while.cond.loopexit ], [ %add, %for.cond.preheader.preheader ]
br label %for.body
for.body: ; preds = %for.body, %for.cond.preheader
%a.154 = phi i32 [ %a.057, %for.cond.preheader ], [ %add21, %for.body ]
%i.053 = phi i32 [ 1, %for.cond.preheader ], [ %inc, %for.body ]
%inc = add nsw i32 %i.053, 1
%add2 = shl i32 %a.154, 1
%add3 = add nsw i32 %add2, %i.053
%add4 = shl i32 %add3, 1
%add5 = add nsw i32 %add4, %i.053
%add6 = shl i32 %add5, 1
%add7 = add nsw i32 %add6, %i.053
%add8 = shl i32 %add7, 1
%add9 = add nsw i32 %add8, %i.053
%add10 = shl i32 %add9, 1
%add11 = add nsw i32 %add10, %i.053
%add12 = shl i32 %add11, 1
%add13 = add nsw i32 %add12, %i.053
%add14 = shl i32 %add13, 1
%add15 = add nsw i32 %add14, %i.053
%add16 = shl i32 %add15, 1
%add17 = add nsw i32 %add16, %i.053
%add18 = shl i32 %add17, 1
%add19 = add nsw i32 %add18, %i.053
%add20 = shl i32 %add19, 1
%add21 = add nsw i32 %add20, %i.053
%exitcond = icmp eq i32 %inc, 1001
br i1 %exitcond, label %while.cond.loopexit, label %for.body
while.end.loopexit: ; preds = %while.cond.loopexit
%add21.lcssa.lcssa = phi i32 [ %add21.lcssa, %while.cond.loopexit ]
br label %while.end
while.end: ; preds = %while.end.loopexit, %entry
%a.0.lcssa = phi i32 [ %add, %entry ], [ %add21.lcssa.lcssa, %while.end.loopexit ]
tail call void @use_int(i32 %a.0.lcssa)
ret void
}
declare void @use_int(i32)