[test] Add coverage for existing overflow rule with uadd.with.overflow

diff --git a/llvm/test/Transforms/InstCombine/uaddo2.ll b/llvm/test/Transforms/InstCombine/uaddo2.ll
new file mode 100644 (file)
index 0000000..2e3cac6
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/uaddo2.ll
@@ -0,0 +1,97 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+declare { i64, i1 } @llvm.uadd.with.overflow.i64(i64, i64)
+declare { i8, i1 } @llvm.uadd.with.overflow.i8(i8, i8)
+
+define i1 @test_generic(i64 %a, i64 %b) {
+; CHECK-LABEL: @test_generic(
+; CHECK-NEXT:    [[RES:%.*]] = tail call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 [[A:%.*]], i64 [[B:%.*]])
+; CHECK-NEXT:    [[OVERFLOW:%.*]] = extractvalue { i64, i1 } [[RES]], 1
+; CHECK-NEXT:    ret i1 [[OVERFLOW]]
+;
+  %res = tail call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 %a, i64 %b)
+  %overflow = extractvalue { i64, i1 } %res, 1
+  ret i1 %overflow
+}
+
+define i1 @test_constant0(i8 %a) {
+; CHECK-LABEL: @test_constant0(
+; CHECK-NEXT:    ret i1 false
+;
+  %res = tail call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 %a, i8 0)
+  %overflow = extractvalue { i8, i1 } %res, 1
+  ret i1 %overflow
+}
+
+define i1 @test_constant1(i8 %a) {
+; CHECK-LABEL: @test_constant1(
+; CHECK-NEXT:    [[OVERFLOW:%.*]] = icmp eq i8 [[A:%.*]], -1
+; CHECK-NEXT:    ret i1 [[OVERFLOW]]
+;
+  %res = tail call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 %a, i8 1)
+  %overflow = extractvalue { i8, i1 } %res, 1
+  ret i1 %overflow
+}
+
+define i1 @test_constant2(i8 %a) {
+; CHECK-LABEL: @test_constant2(
+; CHECK-NEXT:    [[OVERFLOW:%.*]] = icmp ugt i8 [[A:%.*]], -3
+; CHECK-NEXT:    ret i1 [[OVERFLOW]]
+;
+  %res = tail call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 %a, i8 2)
+  %overflow = extractvalue { i8, i1 } %res, 1
+  ret i1 %overflow
+}
+
+define i1 @test_constant3(i8 %a) {
+; CHECK-LABEL: @test_constant3(
+; CHECK-NEXT:    [[OVERFLOW:%.*]] = icmp ugt i8 [[A:%.*]], -4
+; CHECK-NEXT:    ret i1 [[OVERFLOW]]
+;
+  %res = tail call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 %a, i8 3)
+  %overflow = extractvalue { i8, i1 } %res, 1
+  ret i1 %overflow
+}
+
+define i1 @test_constant4(i8 %a) {
+; CHECK-LABEL: @test_constant4(
+; CHECK-NEXT:    [[OVERFLOW:%.*]] = icmp ugt i8 [[A:%.*]], -5
+; CHECK-NEXT:    ret i1 [[OVERFLOW]]
+;
+  %res = tail call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 %a, i8 4)
+  %overflow = extractvalue { i8, i1 } %res, 1
+  ret i1 %overflow
+}
+
+
+define i1 @test_constant127(i8 %a) {
+; CHECK-LABEL: @test_constant127(
+; CHECK-NEXT:    [[OVERFLOW:%.*]] = icmp ugt i8 [[A:%.*]], -128
+; CHECK-NEXT:    ret i1 [[OVERFLOW]]
+;
+  %res = tail call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 %a, i8 127)
+  %overflow = extractvalue { i8, i1 } %res, 1
+  ret i1 %overflow
+}
+
+define i1 @test_constant128(i8 %a) {
+; CHECK-LABEL: @test_constant128(
+; CHECK-NEXT:    [[OVERFLOW:%.*]] = icmp slt i8 [[A:%.*]], 0
+; CHECK-NEXT:    ret i1 [[OVERFLOW]]
+;
+  %res = tail call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 %a, i8 128)
+  %overflow = extractvalue { i8, i1 } %res, 1
+  ret i1 %overflow
+}
+
+define i1 @test_constant255(i8 %a) {
+; CHECK-LABEL: @test_constant255(
+; CHECK-NEXT:    [[OVERFLOW:%.*]] = icmp ne i8 [[A:%.*]], 0
+; CHECK-NEXT:    ret i1 [[OVERFLOW]]
+;
+  %res = tail call { i8, i1 } @llvm.uadd.with.overflow.i8(i8 %a, i8 255)
+  %overflow = extractvalue { i8, i1 } %res, 1
+  ret i1 %overflow
+}
+