131 lines
3.7 KiB
LLVM
131 lines
3.7 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 add unsigned two values, check that addition did not underflow 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 negated offset.
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; If we are checking that the result is not null or no underflow happened,
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; it is tautological (always-true).
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define i1 @t1(i8 %x, i8 %y) {
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; CHECK-LABEL: @t1(
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; CHECK-NEXT: ret i1 true
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;
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%not_null = icmp ne i8 %y, 0
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%no_underflow = icmp ule i8 %y, %x
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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 @t2_commutative(i8 %x, i8 %y) {
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; CHECK-LABEL: @t2_commutative(
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; CHECK-NEXT: ret i1 true
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;
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%not_null = icmp ne i8 %y, 0
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%no_underflow = icmp uge i8 %x, %y ; swapped
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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 @t3_commutative(i8 %x, i8 %y) {
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; CHECK-LABEL: @t3_commutative(
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; CHECK-NEXT: ret i1 true
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;
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%not_null = icmp ne i8 %y, 0
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%no_underflow = icmp ule i8 %y, %x
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%r = or i1 %no_underflow, %not_null ; swapped
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ret i1 %r
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}
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define i1 @t4_commutative(i8 %x, i8 %y) {
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; CHECK-LABEL: @t4_commutative(
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; CHECK-NEXT: ret i1 true
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;
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%not_null = icmp ne i8 %y, 0
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%no_underflow = icmp uge i8 %x, %y ; swapped
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%r = or i1 %no_underflow, %not_null ; swapped
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ret i1 %r
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}
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; If we are checking that the result is null and underflow happened,
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; it is tautological (always-false).
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define i1 @t5(i8 %x, i8 %y) {
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; CHECK-LABEL: @t5(
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; CHECK-NEXT: ret i1 false
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;
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%not_null = icmp eq i8 %y, 0
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%no_underflow = icmp ugt i8 %y, %x
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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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define i1 @t6_commutative(i8 %x, i8 %y) {
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; CHECK-LABEL: @t6_commutative(
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; CHECK-NEXT: ret i1 false
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;
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%not_null = icmp eq i8 %y, 0
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%no_underflow = icmp ult i8 %x, %y ; swapped
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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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; We only need to know that any of the 'add' operands is non-zero,
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; not necessarily the one used in the comparison.
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define i1 @t7(i8 %x, i8 %y) {
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; CHECK-LABEL: @t7(
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; CHECK-NEXT: ret i1 true
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;
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%cmp = icmp slt i8 %y, 0
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%not_null = icmp ne i8 %y, 0
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%no_underflow = icmp ule i8 %y, %x
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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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; If we check that no underflow happened and that the result is null,
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; we can just check for null.
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define i1 @t8(i8 %x, i8 %y) {
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; CHECK-LABEL: @t8(
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i8 [[Y:%.*]], 0
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; CHECK-NEXT: ret i1 [[NOT_NULL]]
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;
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%not_null = icmp eq i8 %y, 0
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%no_underflow = icmp ule i8 %y, %x
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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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; Likewise, if we check that result is non-null or underflow happened,
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; we can just check for null.
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define i1 @t9(i8 %x, i8 %y) {
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; CHECK-LABEL: @t9(
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[Y:%.*]], 0
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; CHECK-NEXT: ret i1 [[NOT_NULL]]
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;
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%not_null = icmp ne i8 %y, 0
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%no_underflow = icmp ugt i8 %y, %x
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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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; If we check that no underflow happened or that the result is not null,
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; we can just check for lack of underflow.
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define i1 @t10(i8 %x, i8 %y) {
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; CHECK-LABEL: @t10(
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]]
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;
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%not_null = icmp eq i8 %y, 0
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%no_underflow = icmp ule i8 %y, %x
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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 check that underflow happened and that the result is not null,
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; we can just check for lack of underflow.
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define i1 @t11(i8 %x, i8 %y) {
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; CHECK-LABEL: @t11(
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i8 [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]]
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;
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%not_null = icmp ne i8 %y, 0
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%no_underflow = icmp ugt i8 %y, %x
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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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