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[NFC] Add motivating test case for revert in rL346198

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llvm-svn: 346199
This commit is contained in:
Max Kazantsev 2018-11-06 02:12:44 +00:00
parent fedead4684
commit 1d195ba0ad
1 changed files with 35 additions and 0 deletions
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35
test/Transforms/IndVarSimplify/constant_result.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -indvars -S | FileCheck %s
@Y = global [400 x i16] zeroinitializer, align 1
define i16 @foo() {
; CHECK-LABEL: @foo(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[I:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [400 x i16], [400 x i16]* @Y, i16 0, i16 [[I]]
; CHECK-NEXT: store i16 0, i16* [[ARRAYIDX]], align 1
; CHECK-NEXT: [[INC]] = add nuw nsw i16 [[I]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i16 [[INC]], 400
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK: for.end:
; CHECK-NEXT: ret i16 400
;
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%i = phi i16 [ 0, %entry ], [ %inc, %for.body ]
%arrayidx = getelementptr inbounds [400 x i16], [400 x i16]* @Y, i16 0, i16 %i
store i16 0, i16* %arrayidx, align 1
%inc = add nuw nsw i16 %i, 1
%cmp = icmp ult i16 %inc, 400
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
%inc.lcssa = phi i16 [ %inc, %for.body ]
ret i16 %inc.lcssa
}