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[LICM] Add test to exercise assertion from D123473. 

Add a test case that triggers an assertion with earlier versions of
D123473.
This commit is contained in:
Florian Hahn 2022-05-05 10:49:51 +01:00
parent 9ebbe25034
commit 3497a4f396
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1 changed files with 38 additions and 0 deletions
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38
llvm/test/Transforms/LICM/scalar-promote.ll
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@ -599,6 +599,44 @@ Out:
}
define i8 @test_hoistable_existing_load_sinkable_store_writeonly(i8* dereferenceable(8) %ptr, i8 %start) writeonly {
; CHECK: Function Attrs: writeonly
; CHECK-LABEL: @test_hoistable_existing_load_sinkable_store_writeonly(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PTR_PROMOTED:%.*]] = load i8, i8* [[PTR:%.*]], align 1
; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
; CHECK: loop.header:
; CHECK-NEXT: [[INC1:%.*]] = phi i8 [ [[PTR_PROMOTED]], [[ENTRY:%.*]] ], [ [[INC1]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT: [[I:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY]] ], [ [[ADD:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i8 [[I]], 4
; CHECK-NEXT: br i1 [[CMP]], label [[LOOP_LATCH]], label [[EXIT:%.*]]
; CHECK: loop.latch:
; CHECK-NEXT: store i8 [[INC1]], i8* [[PTR]], align 1
; CHECK-NEXT: [[ADD]] = add i8 [[I]], [[INC1]]
; CHECK-NEXT: br label [[LOOP_HEADER]]
; CHECK: exit:
; CHECK-NEXT: [[I_LCSSA:%.*]] = phi i8 [ [[I]], [[LOOP_HEADER]] ]
; CHECK-NEXT: ret i8 [[I_LCSSA]]
;
entry:
br label %loop.header
loop.header:
%i = phi i8 [ %start, %entry ], [ %add, %loop.latch ]
%cmp = icmp ult i8 %i, 4
br i1 %cmp, label %loop.latch, label %exit
loop.latch:
%div = sdiv i8 %i, 3
%inc = load i8, i8* %ptr
store i8 %inc, i8* %ptr
%add = add i8 %i, %inc
br label %loop.header
exit:
ret i8 %i
}
@glb = external global i8, align 1
; Test case for PR51248.