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llvm-project/llvm/test/Transforms/InstCombine/result-of-usub-is-non-zero-and-no-overflow.ll
Nikita Popov a105877646
[InstCombine] Remove some of the complexity-based canonicalization (#91185) 
The idea behind this canonicalization is that it allows us to handle less
patterns, because we know that some will be canonicalized away. This is
indeed very useful to e.g. know that constants are always on the right.

However, this is only useful if the canonicalization is actually
reliable. This is the case for constants, but not for arguments: Moving
these to the right makes it look like the "more complex" expression is
guaranteed to be on the left, but this is not actually the case in
practice. It fails as soon as you replace the argument with another
instruction.

The end result is that it looks like things correctly work in tests,
while they actually don't. We use the "thwart complexity-based
canonicalization" trick to handle this in tests, but it's often a
challenge for new contributors to get this right, and based on the
regressions this PR originally exposed, we clearly don't get this right
in many cases.

For this reason, I think that it's better to remove this complexity
canonicalization. It will make it much easier to write tests for
commuted cases and make sure that they are handled.
2024-08-21 12:02:54 +02:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
; Here we subtract two values, check that subtraction did not overflow AND
; that the result is non-zero. This can be simplified just to a comparison
; between the base and offset.
declare void @use8(i8)
declare void @use64(i64)
declare void @use1(i1)
declare {i8, i1} @llvm.usub.with.overflow(i8, i8)
declare void @useagg({i8, i1})
declare void @llvm.assume(i1)
; There is a number of base patterns..
define i1 @t0_noncanonical_ignoreme(i8 %base, i8 %offset) {
; CHECK-LABEL: @t0_noncanonical_ignoreme(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ule i8 %adjusted, %base
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t0_noncanonical_ignoreme_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t0_noncanonical_ignoreme_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ule i8 %adjusted, %base
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 %no_underflow, i1 false
ret i1 %r
}
define i1 @t1(i8 %base, i8 %offset) {
; CHECK-LABEL: @t1(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp uge i8 %base, %offset
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t1_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t1_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp uge i8 %base, %offset
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 %no_underflow, i1 false
ret i1 %r
}
define i1 @t1_strict(i8 %base, i8 %offset) {
; CHECK-LABEL: @t1_strict(
; 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 ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ugt i8 %base, %offset ; same is valid for strict predicate
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t1_strict_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t1_strict_logical(
; 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 ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ugt i8 %base, %offset ; same is valid for strict predicate
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 %no_underflow, i1 false
ret i1 %r
}
define i1 @t2(i8 %base, i8 %offset) {
; CHECK-LABEL: @t2(
; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = xor i1 [[UNDERFLOW]], true
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
call void @useagg({i8, i1} %agg)
%adjusted = extractvalue {i8, i1} %agg, 0
call void @use8(i8 %adjusted)
%underflow = extractvalue {i8, i1} %agg, 1
call void @use1(i1 %underflow)
%no_underflow = xor i1 %underflow, -1
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t2_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t2_logical(
; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = xor i1 [[UNDERFLOW]], true
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
call void @useagg({i8, i1} %agg)
%adjusted = extractvalue {i8, i1} %agg, 0
call void @use8(i8 %adjusted)
%underflow = extractvalue {i8, i1} %agg, 1
call void @use1(i1 %underflow)
%no_underflow = xor i1 %underflow, -1
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
%r = select i1 %not_null, i1 %no_underflow, i1 false
ret i1 %r
}
; Commutativity
define i1 @t3_commutability0(i8 %base, i8 %offset) {
; CHECK-LABEL: @t3_commutability0(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ule i8 %offset, %base ; swapped
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t3_commutability0_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t3_commutability0_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ule i8 %offset, %base ; swapped
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 %no_underflow, i1 false
ret i1 %r
}
define i1 @t4_commutability1(i8 %base, i8 %offset) {
; CHECK-LABEL: @t4_commutability1(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp uge i8 %base, %offset
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %no_underflow, %not_null ; swapped
ret i1 %r
}
define i1 @t4_commutability1_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t4_commutability1_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp uge i8 %base, %offset
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %no_underflow, i1 %not_null, i1 false ; swapped
ret i1 %r
}
define i1 @t5_commutability2(i8 %base, i8 %offset) {
; CHECK-LABEL: @t5_commutability2(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ule i8 %offset, %base ; swapped
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %no_underflow, %not_null ; swapped
ret i1 %r
}
define i1 @t5_commutability2_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t5_commutability2_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[OFFSET]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%no_underflow = icmp ule i8 %offset, %base ; swapped
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %no_underflow, i1 %not_null, i1 false ; swapped
ret i1 %r
}
define i1 @t6_commutability(i8 %base, i8 %offset) {
; CHECK-LABEL: @t6_commutability(
; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = xor i1 [[UNDERFLOW]], true
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
call void @useagg({i8, i1} %agg)
%adjusted = extractvalue {i8, i1} %agg, 0
call void @use8(i8 %adjusted)
%underflow = extractvalue {i8, i1} %agg, 1
call void @use1(i1 %underflow)
%no_underflow = xor i1 %underflow, -1
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
%r = and i1 %no_underflow, %not_null ; swapped
ret i1 %r
}
define i1 @t6_commutability_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t6_commutability_logical(
; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = xor i1 [[UNDERFLOW]], true
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
call void @useagg({i8, i1} %agg)
%adjusted = extractvalue {i8, i1} %agg, 0
call void @use8(i8 %adjusted)
%underflow = extractvalue {i8, i1} %agg, 1
call void @use1(i1 %underflow)
%no_underflow = xor i1 %underflow, -1
call void @use1(i1 %no_underflow)
%not_null = icmp ne i8 %adjusted, 0
%r = select i1 %no_underflow, i1 %not_null, i1 false ; swapped
ret i1 %r
}
; What if we were checking the opposite question, that we either got null,
; or overflow happened?
define i1 @t7(i8 %base, i8 %offset) {
; CHECK-LABEL: @t7(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ult i8 %base, %offset
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = or i1 %null, %underflow
ret i1 %r
}
define i1 @t7_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t7_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ult i8 %base, %offset
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = select i1 %null, i1 true, i1 %underflow
ret i1 %r
}
define i1 @t7_nonstrict(i8 %base, i8 %offset) {
; CHECK-LABEL: @t7_nonstrict(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: ret i1 [[UNDERFLOW]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ule i8 %base, %offset ; same is valid for non-strict predicate
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = or i1 %null, %underflow
ret i1 %r
}
define i1 @t7_nonstrict_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t7_nonstrict_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: ret i1 [[UNDERFLOW]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ule i8 %base, %offset ; same is valid for non-strict predicate
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = select i1 %null, i1 true, i1 %underflow
ret i1 %r
}
define i1 @t8(i8 %base, i8 %offset) {
; CHECK-LABEL: @t8(
; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[R:%.*]] = or i1 [[NULL]], [[UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
call void @useagg({i8, i1} %agg)
%adjusted = extractvalue {i8, i1} %agg, 0
call void @use8(i8 %adjusted)
%underflow = extractvalue {i8, i1} %agg, 1
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
%r = or i1 %null, %underflow
ret i1 %r
}
define i1 @t8_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t8_logical(
; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[R:%.*]] = or i1 [[NULL]], [[UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
call void @useagg({i8, i1} %agg)
%adjusted = extractvalue {i8, i1} %agg, 0
call void @use8(i8 %adjusted)
%underflow = extractvalue {i8, i1} %agg, 1
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
%r = select i1 %null, i1 true, i1 %underflow
ret i1 %r
}
; And these patterns also have commutative variants
define i1 @t9_commutative(i8 %base, i8 %offset) {
; CHECK-LABEL: @t9_commutative(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ult i8 %base, %adjusted ; swapped
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = or i1 %null, %underflow
ret i1 %r
}
define i1 @t9_commutative_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @t9_commutative_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%underflow = icmp ult i8 %base, %adjusted ; swapped
call void @use1(i1 %underflow)
%null = icmp eq i8 %adjusted, 0
call void @use1(i1 %null)
%r = select i1 %null, i1 true, i1 %underflow
ret i1 %r
}
;-------------------------------------------------------------------------------
define i1 @t10(i64 %base, ptr nonnull %offsetptr) {
; CHECK-LABEL: @t10(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%offset = ptrtoint ptr %offsetptr to i64
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp ult i64 %adjusted, %base
call void @use1(i1 %no_underflow)
%not_null = icmp ne i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t10_logical(i64 %base, ptr nonnull %offsetptr) {
; CHECK-LABEL: @t10_logical(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%offset = ptrtoint ptr %offsetptr to i64
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp ult i64 %adjusted, %base
call void @use1(i1 %no_underflow)
%not_null = icmp ne i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 %no_underflow, i1 false
ret i1 %r
}
define i1 @t11_commutative(i64 %base, ptr nonnull %offsetptr) {
; CHECK-LABEL: @t11_commutative(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%offset = ptrtoint ptr %offsetptr to i64
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp ugt i64 %base, %adjusted ; swapped
call void @use1(i1 %no_underflow)
%not_null = icmp ne i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t11_commutative_logical(i64 %base, ptr nonnull %offsetptr) {
; CHECK-LABEL: @t11_commutative_logical(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ugt i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%offset = ptrtoint ptr %offsetptr to i64
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp ugt i64 %base, %adjusted ; swapped
call void @use1(i1 %no_underflow)
%not_null = icmp ne i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 %no_underflow, i1 false
ret i1 %r
}
define i1 @t12(i64 %base, ptr nonnull %offsetptr) {
; CHECK-LABEL: @t12(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ule i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%offset = ptrtoint ptr %offsetptr to i64
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp uge i64 %adjusted, %base
call void @use1(i1 %no_underflow)
%not_null = icmp eq i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t12_logical(i64 %base, ptr nonnull %offsetptr) {
; CHECK-LABEL: @t12_logical(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ule i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%offset = ptrtoint ptr %offsetptr to i64
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp uge i64 %adjusted, %base
call void @use1(i1 %no_underflow)
%not_null = icmp eq i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 true, i1 %no_underflow
ret i1 %r
}
define i1 @t13(i64 %base, ptr nonnull %offsetptr) {
; CHECK-LABEL: @t13(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ule i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%offset = ptrtoint ptr %offsetptr to i64
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp ule i64 %base, %adjusted ; swapped
call void @use1(i1 %no_underflow)
%not_null = icmp eq i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = or i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t13_logical(i64 %base, ptr nonnull %offsetptr) {
; CHECK-LABEL: @t13_logical(
; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = icmp ule i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%offset = ptrtoint ptr %offsetptr to i64
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp ule i64 %base, %adjusted ; swapped
call void @use1(i1 %no_underflow)
%not_null = icmp eq i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 true, i1 %no_underflow
ret i1 %r
}
define i1 @t14_bad(i64 %base, i64 %offset) {
; CHECK-LABEL: @t14_bad(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i64 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp ult i64 %adjusted, %base
call void @use1(i1 %no_underflow)
%not_null = icmp ne i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t14_bad_logical(i64 %base, i64 %offset) {
; CHECK-LABEL: @t14_bad_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use64(i64 [[ADJUSTED]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i64 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i64 [[BASE]], [[OFFSET]]
; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i64 %base, %offset
call void @use64(i64 %adjusted)
%no_underflow = icmp ult i64 %adjusted, %base
call void @use1(i1 %no_underflow)
%not_null = icmp ne i64 %adjusted, 0
call void @use1(i1 %not_null)
%r = select i1 %not_null, i1 %no_underflow, i1 false
ret i1 %r
}
define i1 @base_ult_offset(i8 %base, i8 %offset) {
; CHECK-LABEL: @base_ult_offset(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%not_null = icmp ne i8 %adjusted, 0
%no_underflow = icmp ule i8 %base, %offset
%r = and i1 %no_underflow, %not_null
ret i1 %r
}
define i1 @base_ult_offset_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @base_ult_offset_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%not_null = icmp ne i8 %adjusted, 0
%no_underflow = icmp ule i8 %base, %offset
%r = select i1 %no_underflow, i1 %not_null, i1 false
ret i1 %r
}
define i1 @base_uge_offset(i8 %base, i8 %offset) {
; CHECK-LABEL: @base_uge_offset(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%not_null = icmp eq i8 %adjusted, 0
%no_underflow = icmp ugt i8 %base, %offset
%r = or i1 %no_underflow, %not_null
ret i1 %r
}
define i1 @base_uge_offset_logical(i8 %base, i8 %offset) {
; CHECK-LABEL: @base_uge_offset_logical(
; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
; CHECK-NEXT: ret i1 [[R]]
;
%adjusted = sub i8 %base, %offset
call void @use8(i8 %adjusted)
%not_null = icmp eq i8 %adjusted, 0
%no_underflow = icmp ugt i8 %base, %offset
%r = select i1 %no_underflow, i1 true, i1 %not_null
ret i1 %r
}
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