1 files changed, 124 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/sadd-with-overflow.ll b/llvm/test/Transforms/InstCombine/sadd-with-overflow.ll
new file mode 100644
index 00000000000..0acf6036624
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/sadd-with-overflow.ll
@@ -0,0 +1,124 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+declare { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32>, <2 x i32>)
+
+declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32)
+
+declare { i8, i1 } @llvm.sadd.with.overflow.i8(i8, i8)
+
+define { i32, i1 } @simple_fold(i32 %x) {
+; CHECK-LABEL: @simple_fold(
+; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[X:%.*]], i32 20)
+; CHECK-NEXT:    ret { i32, i1 } [[TMP1]]
+;
+  %a = add nsw i32 %x, 7
+  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 13)
+  ret { i32, i1 } %b
+}
+
+define { i32, i1 } @fold_mixed_signs(i32 %x) {
+; CHECK-LABEL: @fold_mixed_signs(
+; CHECK-NEXT:    [[B:%.*]] = add nsw i32 [[X:%.*]], 6
+; CHECK-NEXT:    [[TMP1:%.*]] = insertvalue { i32, i1 } { i32 undef, i1 false }, i32 [[B]], 0
+; CHECK-NEXT:    ret { i32, i1 } [[TMP1]]
+;
+  %a = add nsw i32 %x, 13
+  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 -7)
+  ret { i32, i1 } %b
+}
+
+define { i8, i1 } @fold_on_constant_add_no_overflow(i8 %x) {
+; CHECK-LABEL: @fold_on_constant_add_no_overflow(
+; CHECK-NEXT:    [[TMP1:%.*]] = call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 [[X:%.*]], i8 127)
+; CHECK-NEXT:    ret { i8, i1 } [[TMP1]]
+;
+  %a = add nsw i8 %x, 100
+  %b = tail call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 %a, i8 27)
+  ret { i8, i1 } %b
+}
+
+define { i8, i1 } @no_fold_on_constant_add_overflow(i8 %x) {
+; CHECK-LABEL: @no_fold_on_constant_add_overflow(
+; CHECK-NEXT:    [[A:%.*]] = add nsw i8 [[X:%.*]], 100
+; CHECK-NEXT:    [[B:%.*]] = tail call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 [[A]], i8 28)
+; CHECK-NEXT:    ret { i8, i1 } [[B]]
+;
+  %a = add nsw i8 %x, 100
+  %b = tail call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 %a, i8 28)
+  ret { i8, i1 } %b
+}
+
+define { <2 x i32>, <2 x i1> } @fold_simple_splat_constant(<2 x i32> %x) {
+; CHECK-LABEL: @fold_simple_splat_constant(
+; CHECK-NEXT:    [[TMP1:%.*]] = call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[X:%.*]], <2 x i32> <i32 42, i32 42>)
+; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[TMP1]]
+;
+  %a = add nsw <2 x i32> %x, <i32 12, i32 12>
+  %b = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %a, <2 x i32> <i32 30, i32 30>)
+  ret { <2 x i32>, <2 x i1> } %b
+}
+
+define { <2 x i32>, <2 x i1> } @no_fold_splat_undef_constant(<2 x i32> %x) {
+; CHECK-LABEL: @no_fold_splat_undef_constant(
+; CHECK-NEXT:    [[A:%.*]] = add nsw <2 x i32> [[X:%.*]], <i32 12, i32 undef>
+; CHECK-NEXT:    [[B:%.*]] = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[A]], <2 x i32> <i32 30, i32 30>)
+; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[B]]
+;
+  %a = add nsw <2 x i32> %x, <i32 12, i32 undef>
+  %b = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %a, <2 x i32> <i32 30, i32 30>)
+  ret { <2 x i32>, <2 x i1> } %b
+}
+
+define { <2 x i32>, <2 x i1> } @no_fold_splat_not_constant(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: @no_fold_splat_not_constant(
+; CHECK-NEXT:    [[A:%.*]] = add nsw <2 x i32> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[B:%.*]] = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[A]], <2 x i32> <i32 30, i32 30>)
+; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[B]]
+;
+  %a = add nsw <2 x i32> %x, %y
+  %b = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %a, <2 x i32> <i32 30, i32 30>)
+  ret { <2 x i32>, <2 x i1> } %b
+}
+
+define { i32, i1 } @fold_nuwnsw(i32 %x) {
+; CHECK-LABEL: @fold_nuwnsw(
+; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[X:%.*]], i32 42)
+; CHECK-NEXT:    ret { i32, i1 } [[TMP1]]
+;
+  %a = add nuw nsw i32 %x, 12
+  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 30)
+  ret { i32, i1 } %b
+}
+
+define { i32, i1 } @no_fold_nuw(i32 %x) {
+; CHECK-LABEL: @no_fold_nuw(
+; CHECK-NEXT:    [[A:%.*]] = add nuw i32 [[X:%.*]], 12
+; CHECK-NEXT:    [[B:%.*]] = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[A]], i32 30)
+; CHECK-NEXT:    ret { i32, i1 } [[B]]
+;
+  %a = add nuw i32 %x, 12
+  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 30)
+  ret { i32, i1 } %b
+}
+
+define { i32, i1 } @no_fold_wrapped_add(i32 %x) {
+; CHECK-LABEL: @no_fold_wrapped_add(
+; CHECK-NEXT:    [[A:%.*]] = add i32 [[X:%.*]], 12
+; CHECK-NEXT:    [[B:%.*]] = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[A]], i32 30)
+; CHECK-NEXT:    ret { i32, i1 } [[B]]
+;
+  %a = add i32 %x, 12
+  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 30, i32 %a)
+  ret { i32, i1 } %b
+}
+
+define { i32, i1 } @fold_sub_simple(i32 %x) {
+; CHECK-LABEL: @fold_sub_simple(
+; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[X:%.*]], i32 42)
+; CHECK-NEXT:    ret { i32, i1 } [[TMP1]]
+;
+  %a = sub nsw i32 %x, -12
+  %b = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 30)
+  ret { i32, i1 } %b
+}