llvm-project/llvm/test/Transforms/InstCombine/result-of-add-of-negative-i...

236 lines
8.8 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt %s -instcombine -S | FileCheck %s
; Here we add unsigned two values, check that addition did not underflow AND
; that the result is non-zero. This can be simplified just to a comparison
; between the base and negated offset.
declare void @use8(i8)
declare void @use1(i1)
declare void @llvm.assume(i1)
; Here we don't know that at least one of the values being added is non-zero
define i1 @t0_bad(i8 %base, i8 %offset) {
; CHECK-LABEL: @t0_bad(
; 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:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%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 = and i1 %not_null, %no_underflow
ret i1 %r
}
; Ok, base is non-zero.
define i1 @t1(i8 %base, i8 %offset) {
; CHECK-LABEL: @t1(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[BASE:%.*]], 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:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %base, 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 = and i1 %not_null, %no_underflow
ret i1 %r
}
; Ok, offset is non-zero.
define i1 @t2(i8 %base, i8 %offset) {
; CHECK-LABEL: @t2(
; 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:%.*]] = and 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 = and i1 %not_null, %no_underflow
ret i1 %r
}
; We need to produce extra instruction, so one of icmp's must go away.
define i1 @t3_oneuse0(i8 %base, i8 %offset) {
; CHECK-LABEL: @t3_oneuse0(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[BASE:%.*]], 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: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i8 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %base, 0
call void @llvm.assume(i1 %cmp)
%adjusted = add i8 %base, %offset
call void @use8(i8 %adjusted)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%no_underflow = icmp ult i8 %adjusted, %base
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t4_oneuse1(i8 %base, i8 %offset) {
; CHECK-LABEL: @t4_oneuse1(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[BASE:%.*]], 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: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %base, 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
call void @use1(i1 %no_underflow)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t5_oneuse2_bad(i8 %base, i8 %offset) {
; CHECK-LABEL: @t5_oneuse2_bad(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[BASE:%.*]], 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: call void @use1(i1 [[NOT_NULL]])
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i8 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %base, 0
call void @llvm.assume(i1 %cmp)
%adjusted = add i8 %base, %offset
call void @use8(i8 %adjusted)
%not_null = icmp ne i8 %adjusted, 0
call void @use1(i1 %not_null)
%no_underflow = icmp ult i8 %adjusted, %base
call void @use1(i1 %no_underflow)
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t6_commutativity0(i8 %base, i8 %offset) {
; CHECK-LABEL: @t6_commutativity0(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[BASE:%.*]], 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:%.*]] = and i1 [[NO_UNDERFLOW]], [[NOT_NULL]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %base, 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 = and i1 %no_underflow, %not_null ; swapped
ret i1 %r
}
define i1 @t7_commutativity1(i8 %base, i8 %offset) {
; CHECK-LABEL: @t7_commutativity1(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[BASE:%.*]], 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 ule i8 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %base, 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 uge i8 %base, %adjusted ; swapped
%r = and i1 %not_null, %no_underflow
ret i1 %r
}
define i1 @t7_commutativity3(i8 %base, i8 %offset) {
; CHECK-LABEL: @t7_commutativity3(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[BASE:%.*]], 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 ule i8 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: [[R:%.*]] = and i1 [[NO_UNDERFLOW]], [[NOT_NULL]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %base, 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 uge i8 %base, %adjusted ; swapped
%r = and i1 %no_underflow, %not_null ; swapped
ret i1 %r
}
; We could have the opposite question, did we get null or overflow happened?
define i1 @t8(i8 %base, i8 %offset) {
; CHECK-LABEL: @t8(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[BASE:%.*]], 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 eq i8 [[ADJUSTED]], 0
; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[ADJUSTED]], [[BASE]]
; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
; CHECK-NEXT: ret i1 [[R]]
;
%cmp = icmp slt i8 %base, 0
call void @llvm.assume(i1 %cmp)
%adjusted = add i8 %base, %offset
call void @use8(i8 %adjusted)
%not_null = icmp eq i8 %adjusted, 0
%no_underflow = icmp uge i8 %adjusted, %base
%r = or i1 %not_null, %no_underflow
ret i1 %r
}