forked from OSchip/llvm-project
179 lines
6.5 KiB
LLVM
179 lines
6.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt %s -instsimplify -S | FileCheck %s
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; Here we subtract two values, check that subtraction did not overflow AND
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; that the result is non-zero. This can be simplified just to a comparison
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; between the base and offset.
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declare void @use8(i8)
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declare void @use64(i64)
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declare void @use1(i1)
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declare void @llvm.assume(i1)
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; If we are checking that we either did not get null or got no overflow,
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; this is tautological and is always true.
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define i1 @t1(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t1(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: ret i1 true
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp uge i8 %base, %offset
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = or i1 %not_null, %no_underflow
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ret i1 %r
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}
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define i1 @t1_strict_bad(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t1_strict_bad(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp ugt i8 %base, %offset ; but not for non-strict predicate
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = or i1 %not_null, %no_underflow
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ret i1 %r
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}
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define i1 @t1_commutativity(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t1_commutativity(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[OFFSET]], [[BASE]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: ret i1 true
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp ule i8 %offset, %base
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = or i1 %not_null, %no_underflow
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ret i1 %r
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}
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; Likewise, if we are checking that we both got null and overflow happened,
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; it makes no sense and is always false.
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define i1 @t2(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t2(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NULL]])
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; CHECK-NEXT: ret i1 false
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%underflow = icmp ult i8 %base, %offset
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call void @use1(i1 %underflow)
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%null = icmp eq i8 %adjusted, 0
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call void @use1(i1 %null)
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%r = and i1 %null, %underflow
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ret i1 %r
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}
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define i1 @t2_nonstrict_bad(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t2_nonstrict_bad(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp uge i8 [[ADJUSTED]], [[BASE]]
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NULL]])
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%underflow = icmp uge i8 %adjusted, %base ; but not for non-strict predicate
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call void @use1(i1 %underflow)
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%null = icmp eq i8 %adjusted, 0
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call void @use1(i1 %null)
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%r = and i1 %null, %underflow
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ret i1 %r
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}
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define i1 @t2_commutativity(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t2_commutativity(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ugt i8 [[OFFSET]], [[BASE]]
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NULL]])
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; CHECK-NEXT: ret i1 false
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%underflow = icmp ugt i8 %offset, %base
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call void @use1(i1 %underflow)
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%null = icmp eq i8 %adjusted, 0
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call void @use1(i1 %null)
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%r = and i1 %null, %underflow
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ret i1 %r
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}
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; Overflow OR not zero => always true
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define i1 @t3(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t3(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: ret i1 true
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp ule i8 %base, %offset
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = or i1 %not_null, %no_underflow
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ret i1 %r
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}
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; No overflow and zero => always false
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define i1 @t4(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t4(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: ret i1 false
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp ugt i8 %base, %offset
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call void @use1(i1 %no_underflow)
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%not_null = icmp eq i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = and i1 %not_null, %no_underflow
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ret i1 %r
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}
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