[InstCombine] Add tests for add nsw + sadd.with.overflow; NFC

Baseline tests for D58881, which fixes part of PR38146.

Patch by Dan Robertson.

llvm-svn: 355328

diff --git a/llvm/test/Transforms/InstCombine/sadd-with-overflow.ll b/llvm/test/Transforms/InstCombine/sadd-with-overflow.ll
new file mode 100644 (file)
index 0000000..ecbe647
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/sadd-with-overflow.ll
@@ -0,0 +1,96 @@
+; 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) {
+; CHECK-LABEL: @simple_fold(
+; CHECK-NEXT:    [[TMP2:%.*]] = add nsw i32 [[TMP0:%.*]], 7
+; CHECK-NEXT:    [[TMP3:%.*]] = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[TMP2]], i32 13)
+; CHECK-NEXT:    ret { i32, i1 } [[TMP3]]
+;
+  %2 = add nsw i32 %0, 7
+  %3 = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %2, i32 13)
+  ret { i32, i1 } %3
+}
+
+define { i32, i1 } @fold_mixed_signs(i32) {
+; CHECK-LABEL: @fold_mixed_signs(
+; CHECK-NEXT:    [[TMP2:%.*]] = add nsw i32 [[TMP0:%.*]], 13
+; CHECK-NEXT:    [[TMP3:%.*]] = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[TMP2]], i32 -7)
+; CHECK-NEXT:    ret { i32, i1 } [[TMP3]]
+;
+  %2 = add nsw i32 %0, 13
+  %3 = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %2, i32 -7)
+  ret { i32, i1 } %3
+}
+
+define { i8, i1 } @no_fold_on_constant_add_overflow(i8) {
+; CHECK-LABEL: @no_fold_on_constant_add_overflow(
+; CHECK-NEXT:    [[TMP2:%.*]] = add nsw i8 [[TMP0:%.*]], 127
+; CHECK-NEXT:    [[TMP3:%.*]] = tail call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 [[TMP2]], i8 127)
+; CHECK-NEXT:    ret { i8, i1 } [[TMP3]]
+;
+  %2 = add nsw i8 %0, 127
+  %3 = tail call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 %2, i8 127)
+  ret { i8, i1 } %3
+}
+
+define { <2 x i32>, <2 x i1> } @fold_simple_splat_constant(<2 x i32>) {
+; CHECK-LABEL: @fold_simple_splat_constant(
+; CHECK-NEXT:    [[TMP2:%.*]] = add nsw <2 x i32> [[TMP0:%.*]], <i32 12, i32 12>
+; CHECK-NEXT:    [[TMP3:%.*]] = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[TMP2]], <2 x i32> <i32 30, i32 30>)
+; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[TMP3]]
+;
+  %2 = add nsw <2 x i32> %0, <i32 12, i32 12>
+  %3 = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %2, <2 x i32> <i32 30, i32 30>)
+  ret { <2 x i32>, <2 x i1> } %3
+}
+
+define { <2 x i32>, <2 x i1> } @no_fold_splat_undef_constant(<2 x i32>) {
+; CHECK-LABEL: @no_fold_splat_undef_constant(
+; CHECK-NEXT:    [[TMP2:%.*]] = add nsw <2 x i32> [[TMP0:%.*]], <i32 12, i32 undef>
+; CHECK-NEXT:    [[TMP3:%.*]] = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[TMP2]], <2 x i32> <i32 30, i32 30>)
+; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[TMP3]]
+;
+  %2 = add nsw <2 x i32> %0, <i32 12, i32 undef>
+  %3 = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %2, <2 x i32> <i32 30, i32 30>)
+  ret { <2 x i32>, <2 x i1> } %3
+}
+
+define { <2 x i32>, <2 x i1> } @no_fold_splat_not_constant(<2 x i32>, <2 x i32>) {
+; CHECK-LABEL: @no_fold_splat_not_constant(
+; CHECK-NEXT:    [[TMP3:%.*]] = add nsw <2 x i32> [[TMP0:%.*]], [[TMP1:%.*]]
+; CHECK-NEXT:    [[TMP4:%.*]] = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> [[TMP3]], <2 x i32> <i32 30, i32 30>)
+; CHECK-NEXT:    ret { <2 x i32>, <2 x i1> } [[TMP4]]
+;
+  %3 = add nsw <2 x i32> %0, %1
+  %4 = tail call { <2 x i32>, <2 x i1> } @llvm.sadd.with.overflow.v2i32(<2 x i32> %3, <2 x i32> <i32 30, i32 30>)
+  ret { <2 x i32>, <2 x i1> } %4
+}
+
+define { i32, i1 } @fold_nuwnsw(i32) {
+; CHECK-LABEL: @fold_nuwnsw(
+; CHECK-NEXT:    [[TMP2:%.*]] = add nuw nsw i32 [[TMP0:%.*]], 12
+; CHECK-NEXT:    [[TMP3:%.*]] = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[TMP2]], i32 30)
+; CHECK-NEXT:    ret { i32, i1 } [[TMP3]]
+;
+  %2 = add nuw nsw i32 %0, 12
+  %3 = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %2, i32 30)
+  ret { i32, i1 } %3
+}
+
+define { i32, i1 } @no_fold_nuw(i32) {
+; CHECK-LABEL: @no_fold_nuw(
+; CHECK-NEXT:    [[TMP2:%.*]] = add nuw i32 [[TMP0:%.*]], 12
+; CHECK-NEXT:    [[TMP3:%.*]] = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[TMP2]], i32 30)
+; CHECK-NEXT:    ret { i32, i1 } [[TMP3]]
+;
+  %2 = add nuw i32 %0, 12
+  %3 = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %2, i32 30)
+  ret { i32, i1 } %3
+}