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[NFC][InstSimplify] Add some more tests for D67498/D67502

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llvm-svn: 371877
This commit is contained in:
Roman Lebedev 2019-09-13 17:58:24 +00:00
parent f1f1dbe202
commit 9ebe05f6e3
2 changed files with 68 additions and 0 deletions
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24
test/Transforms/InstSimplify/result-of-add-of-negative-is-non-zero-and-no-underflow.ll
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@ -99,3 +99,27 @@ define i1 @t4_commutative(i8 %base, i8 %offset) {
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
; We only need to know that any of the 'add' operands is non-zero,
; not necessarily the one used in the comparison.
define i1 @t5(i8 %base, i8 %offset) {
; CHECK-LABEL: @t5(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[OFFSET:%.*]], 0
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = add i8 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i8 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %offset, 0
call void @llvm.assume(i1 %cmp)
%adjusted = add i8 %base, %offset
call void @use8(i8 %adjusted)
%not_null = icmp ne i8 %adjusted, 0
%no_underflow = icmp ult i8 %adjusted, %base
%r = or i1 %not_null, %no_underflow
ret i1 %r
}

44
test/Transforms/InstSimplify/result-of-usub-is-non-zero-and-no-overflow.ll
View File

@ -138,3 +138,47 @@ define i1 @t2_commutativity(i8 %base, i8 %offset) {
%r = and i1 %null, %underflow
ret i1 %r
}
; Overflow OR not zero => always true
define i1 @t3(i8 %base, i8 %offset) {
; CHECK-LABEL: @t3(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ule i8 %base, %offset
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
; No overflow and zero => always false
define i1 @t4(i8 %base, i8 %offset) {
; CHECK-LABEL: @t4(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ugt i8 %base, %offset
call void @use1(i1 %no_underflow)
%not_null = icmp eq i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}