[InstCombine] Add tests for expanding `foldSelectValueEquivalence`; NFC

1 files changed, 186 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/select-cmp-eq-op-fold.ll b/llvm/test/Transforms/InstCombine/select-cmp-eq-op-fold.ll
new file mode 100644
index 0000000..ec82b19
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/select-cmp-eq-op-fold.ll
@@ -0,0 +1,186 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -passes=instcombine -S | FileCheck %s
+
+declare void @use.i1(i1)
+declare void @use.i8(i8)
+define i8 @replace_with_y_noundef(i8 %x, i8 noundef %y, i8 %z) {
+; CHECK-LABEL: @replace_with_y_noundef(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[AND]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %cmp = icmp eq i8 %x, %y
+  %and = and i8 %x, %y
+  %sel = select i1 %cmp, i8 %and, i8 %z
+  ret i8 %sel
+}
+
+define i8 @replace_with_x_noundef(i8 noundef %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @replace_with_x_noundef(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    call void @use.i1(i1 [[CMP]])
+; CHECK-NEXT:    [[AND:%.*]] = or i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[Z:%.*]], i8 [[AND]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %cmp = icmp ne i8 %x, %y
+  call void @use.i1(i1 %cmp)
+  %and = or i8 %x, %y
+  %sel = select i1 %cmp, i8 %z, i8 %and
+  ret i8 %sel
+}
+
+define i8 @replace_with_x_maybe_undef_fail(i8 %x, i8 %y, i8 %z) {
+; CHECK-LABEL: @replace_with_x_maybe_undef_fail(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    call void @use.i1(i1 [[CMP]])
+; CHECK-NEXT:    [[AND:%.*]] = or i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[Z:%.*]], i8 [[AND]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %cmp = icmp ne i8 %x, %y
+  call void @use.i1(i1 %cmp)
+  %and = or i8 %x, %y
+  %sel = select i1 %cmp, i8 %z, i8 %and
+  ret i8 %sel
+}
+
+define i8 @replace_with_y_for_new_oneuse(i8 noundef %xx, i8 noundef %y, i8 %z) {
+; CHECK-LABEL: @replace_with_y_for_new_oneuse(
+; CHECK-NEXT:    [[X:%.*]] = mul i8 [[XX:%.*]], 13
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X]], [[Y:%.*]]
+; CHECK-NEXT:    [[ADD:%.*]] = add nuw i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[ADD]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %x = mul i8 %xx, 13
+  %cmp = icmp eq i8 %x, %y
+  %add = add nuw i8 %x, %y
+  %sel = select i1 %cmp, i8 %add, i8 %z
+  ret i8 %sel
+}
+
+define i8 @replace_with_y_for_new_oneuse2(i8 %xx, i8 noundef %y, i8 %z, i8 %q) {
+; CHECK-LABEL: @replace_with_y_for_new_oneuse2(
+; CHECK-NEXT:    [[X:%.*]] = mul i8 [[XX:%.*]], 13
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X]], [[Y:%.*]]
+; CHECK-NEXT:    [[ADD:%.*]] = add nuw i8 [[X]], [[Q:%.*]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[ADD]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %x = mul i8 %xx, 13
+  %cmp = icmp eq i8 %x, %y
+  %add = add nuw i8 %x, %q
+  %sel = select i1 %cmp, i8 %add, i8 %z
+  ret i8 %sel
+}
+
+define i8 @replace_with_x_for_new_oneuse(i8 noundef %xx, i8 noundef %yy, i8 %z, i8 %w) {
+; CHECK-LABEL: @replace_with_x_for_new_oneuse(
+; CHECK-NEXT:    [[X:%.*]] = mul i8 [[XX:%.*]], 13
+; CHECK-NEXT:    [[Y:%.*]] = add i8 [[YY:%.*]], [[W:%.*]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[MUL:%.*]] = mul i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[MUL]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %x = mul i8 %xx, 13
+  %y = add i8 %yy, %w
+  %cmp = icmp eq i8 %x, %y
+  %mul = mul i8 %x, %y
+  %sel = select i1 %cmp, i8 %mul, i8 %z
+  ret i8 %sel
+}
+
+define i8 @replace_with_x_for_new_oneuse2(i8 noundef %xx, i8 %yy, i8 %z, i8 %w, i8 %q) {
+; CHECK-LABEL: @replace_with_x_for_new_oneuse2(
+; CHECK-NEXT:    [[X:%.*]] = mul i8 [[XX:%.*]], 13
+; CHECK-NEXT:    [[Y:%.*]] = add i8 [[YY:%.*]], [[W:%.*]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[MUL:%.*]] = mul i8 [[Y]], [[Q:%.*]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[MUL]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %x = mul i8 %xx, 13
+  %y = add i8 %yy, %w
+  %cmp = icmp eq i8 %x, %y
+  %mul = mul i8 %q, %y
+  %sel = select i1 %cmp, i8 %mul, i8 %z
+  ret i8 %sel
+}
+
+define i8 @replace_with_x_for_simple_binop(i8 noundef %xx, i8 %yy, i8 %z, i8 %w) {
+; CHECK-LABEL: @replace_with_x_for_simple_binop(
+; CHECK-NEXT:    [[X:%.*]] = mul i8 [[XX:%.*]], 13
+; CHECK-NEXT:    [[Y:%.*]] = add i8 [[YY:%.*]], [[W:%.*]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[MUL:%.*]] = mul i8 [[X]], [[Y]]
+; CHECK-NEXT:    call void @use.i8(i8 [[Y]])
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[MUL]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %x = mul i8 %xx, 13
+  %y = add i8 %yy, %w
+  %cmp = icmp eq i8 %x, %y
+  %mul = mul i8 %x, %y
+  call void @use.i8(i8 %y)
+  %sel = select i1 %cmp, i8 %mul, i8 %z
+  ret i8 %sel
+}
+
+define i8 @replace_with_none_for_new_oneuse_fail_maybe_undef(i8 %xx, i8 %y, i8 %z) {
+; CHECK-LABEL: @replace_with_none_for_new_oneuse_fail_maybe_undef(
+; CHECK-NEXT:    [[X:%.*]] = mul i8 [[XX:%.*]], 13
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X]], [[Y:%.*]]
+; CHECK-NEXT:    [[MUL:%.*]] = mul i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[MUL]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %x = mul i8 %xx, 13
+  %cmp = icmp eq i8 %x, %y
+  %mul = mul i8 %x, %y
+  %sel = select i1 %cmp, i8 %mul, i8 %z
+  ret i8 %sel
+}
+
+define i8 @replace_with_y_for_simple_binop(i8 %x, i8 noundef %y, i8 %z) {
+; CHECK-LABEL: @replace_with_y_for_simple_binop(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[MUL:%.*]] = mul nsw i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[MUL]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %cmp = icmp eq i8 %x, %y
+  %mul = mul nsw i8 %x, %y
+  %sel = select i1 %cmp, i8 %mul, i8 %z
+  ret i8 %sel
+}
+
+define i8 @replace_with_y_for_simple_binop_fail_multiuse(i8 %x, i8 noundef %y, i8 %z) {
+; CHECK-LABEL: @replace_with_y_for_simple_binop_fail_multiuse(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[MUL:%.*]] = mul nsw i8 [[X]], [[Y]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[MUL]], i8 [[Z:%.*]]
+; CHECK-NEXT:    call void @use.i8(i8 [[MUL]])
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %cmp = icmp eq i8 %x, %y
+  %mul = mul nsw i8 %x, %y
+  %sel = select i1 %cmp, i8 %mul, i8 %z
+  call void @use.i8(i8 %mul)
+  ret i8 %sel
+}
+
+define i8 @replace_with_y_for_simple_binop_fail(i8 %x, i8 noundef %y, i8 %z, i8 %q) {
+; CHECK-LABEL: @replace_with_y_for_simple_binop_fail(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i8 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[MUL:%.*]] = mul nsw i8 [[X]], [[Q:%.*]]
+; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i8 [[MUL]], i8 [[Z:%.*]]
+; CHECK-NEXT:    ret i8 [[SEL]]
+;
+  %cmp = icmp eq i8 %x, %y
+  %mul = mul nsw i8 %x, %q
+  %sel = select i1 %cmp, i8 %mul, i8 %z
+  ret i8 %sel
+}