diff options
Diffstat (limited to 'llvm/test/Transforms/InstCombine/saturating-add-sub.ll')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/saturating-add-sub.ll | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/saturating-add-sub.ll b/llvm/test/Transforms/InstCombine/saturating-add-sub.ll index de3af0008c9..da3daecf393 100644 --- a/llvm/test/Transforms/InstCombine/saturating-add-sub.ll +++ b/llvm/test/Transforms/InstCombine/saturating-add-sub.ll @@ -771,6 +771,36 @@ define i32 @uadd_sat_commute_select_ugt_commute_add(i32 %xp, i32 %y) { ret i32 %r } +; Negative test - make sure we have a -1 in the select. + +define i32 @not_uadd_sat(i32 %x, i32 %y) { +; CHECK-LABEL: @not_uadd_sat( +; CHECK-NEXT: [[A:%.*]] = add i32 [[X:%.*]], -2 +; CHECK-NEXT: [[C:%.*]] = icmp ugt i32 [[X]], 1 +; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 [[A]], i32 [[Y:%.*]] +; CHECK-NEXT: ret i32 [[R]] +; + %a = add i32 %x, -2 + %c = icmp ugt i32 %x, 1 + %r = select i1 %c, i32 %a, i32 %y + ret i32 %r +} + +; Negative test - make sure the predicate is 'ult'. + +define i32 @not_uadd_sat2(i32 %x, i32 %y) { +; CHECK-LABEL: @not_uadd_sat2( +; CHECK-NEXT: [[A:%.*]] = add i32 [[X:%.*]], -2 +; CHECK-NEXT: [[C:%.*]] = icmp ugt i32 [[X]], 1 +; CHECK-NEXT: [[R:%.*]] = select i1 [[C]], i32 [[A]], i32 -1 +; CHECK-NEXT: ret i32 [[R]] +; + %a = add i32 %x, -2 + %c = icmp ugt i32 %x, 1 + %r = select i1 %c, i32 %a, i32 -1 + ret i32 %r +} + define i32 @uadd_sat_constant(i32 %x) { ; CHECK-LABEL: @uadd_sat_constant( ; CHECK-NEXT: [[A:%.*]] = add i32 [[X:%.*]], 42 |
