| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt %s -instsimplify -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. |
| |
| ; If we are checking that the result is not null or no underflow happened, |
| ; it is tautological (always-true). |
| define i1 @t1(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t1( |
| ; CHECK-NEXT: ret i1 true |
| ; |
| %not_null = icmp ne i8 %y, 0 |
| %no_underflow = icmp ule i8 %y, %x |
| %r = or i1 %not_null, %no_underflow |
| ret i1 %r |
| } |
| define i1 @t2_commutative(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t2_commutative( |
| ; CHECK-NEXT: ret i1 true |
| ; |
| %not_null = icmp ne i8 %y, 0 |
| %no_underflow = icmp uge i8 %x, %y ; swapped |
| %r = or i1 %not_null, %no_underflow |
| ret i1 %r |
| } |
| |
| define i1 @t3_commutative(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t3_commutative( |
| ; CHECK-NEXT: ret i1 true |
| ; |
| %not_null = icmp ne i8 %y, 0 |
| %no_underflow = icmp ule i8 %y, %x |
| %r = or i1 %no_underflow, %not_null ; swapped |
| ret i1 %r |
| } |
| define i1 @t4_commutative(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t4_commutative( |
| ; CHECK-NEXT: ret i1 true |
| ; |
| %not_null = icmp ne i8 %y, 0 |
| %no_underflow = icmp uge i8 %x, %y ; swapped |
| %r = or i1 %no_underflow, %not_null ; swapped |
| ret i1 %r |
| } |
| |
| ; If we are checking that the result is null and underflow happened, |
| ; it is tautological (always-false). |
| define i1 @t5(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t5( |
| ; CHECK-NEXT: ret i1 false |
| ; |
| %not_null = icmp eq i8 %y, 0 |
| %no_underflow = icmp ugt i8 %y, %x |
| %r = and i1 %not_null, %no_underflow |
| ret i1 %r |
| } |
| define i1 @t6_commutative(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t6_commutative( |
| ; CHECK-NEXT: ret i1 false |
| ; |
| %not_null = icmp eq i8 %y, 0 |
| %no_underflow = icmp ult i8 %x, %y ; swapped |
| %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 @t7(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t7( |
| ; CHECK-NEXT: ret i1 true |
| ; |
| %cmp = icmp slt i8 %y, 0 |
| %not_null = icmp ne i8 %y, 0 |
| %no_underflow = icmp ule i8 %y, %x |
| %r = or i1 %not_null, %no_underflow |
| ret i1 %r |
| } |
| |
| ; If we check that no underflow happened and that the result is null, |
| ; we can just check for null. |
| define i1 @t8(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t8( |
| ; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq i8 [[Y:%.*]], 0 |
| ; CHECK-NEXT: ret i1 [[NOT_NULL]] |
| ; |
| %not_null = icmp eq i8 %y, 0 |
| %no_underflow = icmp ule i8 %y, %x |
| %r = and i1 %not_null, %no_underflow |
| ret i1 %r |
| } |
| ; Likewise, if we check that result is non-null or underflow happened, |
| ; we can just check for null. |
| define i1 @t9(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t9( |
| ; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[Y:%.*]], 0 |
| ; CHECK-NEXT: ret i1 [[NOT_NULL]] |
| ; |
| %not_null = icmp ne i8 %y, 0 |
| %no_underflow = icmp ugt i8 %y, %x |
| %r = or i1 %not_null, %no_underflow |
| ret i1 %r |
| } |
| |
| ; If we check that no underflow happened or that the result is not null, |
| ; we can just check for lack of underflow. |
| define i1 @t10(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t10( |
| ; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[Y:%.*]], [[X:%.*]] |
| ; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]] |
| ; |
| %not_null = icmp eq i8 %y, 0 |
| %no_underflow = icmp ule i8 %y, %x |
| %r = or i1 %not_null, %no_underflow |
| ret i1 %r |
| } |
| ; Likewise, if we check that underflow happened and that the result is not null, |
| ; we can just check for lack of underflow. |
| define i1 @t11(i8 %x, i8 %y) { |
| ; CHECK-LABEL: @t11( |
| ; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i8 [[Y:%.*]], [[X:%.*]] |
| ; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]] |
| ; |
| %not_null = icmp ne i8 %y, 0 |
| %no_underflow = icmp ugt i8 %y, %x |
| %r = and i1 %not_null, %no_underflow |
| ret i1 %r |
| } |