// TODO: Some instructions are guaranteed to return neither undef
// nor poison if their arguments are not poison/undef.
+ if (auto *A = dyn_cast<Argument>(V)) {
+ // NoUndef does not guarantee that paddings are not undef.
+ if (A->hasAttribute(Attribute::NoUndef))
+ return true;
+ }
+
if (auto *C = dyn_cast<Constant>(V)) {
// TODO: We can analyze ConstExpr by opcode to determine if there is any
// possibility of poison.
define i8 @noundef(i8 noundef %x) {
; CHECK-LABEL: @noundef(
-; CHECK-NEXT: [[Y:%.*]] = freeze i8 [[X:%.*]]
-; CHECK-NEXT: ret i8 [[Y]]
+; CHECK-NEXT: ret i8 [[X:%.*]]
;
%y = freeze i8 %x
ret i8 %y
define i1 @icmp(i8 noundef %x, i8 noundef %y) {
; CHECK-LABEL: @icmp(
; CHECK-NEXT: [[C:%.*]] = icmp eq i8 [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT: [[F:%.*]] = freeze i1 [[C]]
-; CHECK-NEXT: ret i1 [[F]]
+; CHECK-NEXT: ret i1 [[C]]
;
%c = icmp eq i8 %x, %y
%f = freeze i1 %c
ret i1 %f
}
+; TODO: should look into binary operations
define i1 @or(i1 noundef %x, i1 noundef %x2) {
; CHECK-LABEL: @or(
; CHECK-NEXT: [[Y:%.*]] = or i1 [[X:%.*]], [[X2:%.*]]
ret i1 %z
}
+; TODO: should look into binary operations
define i8 @add(i8 noundef %x) {
; CHECK-LABEL: @add(
; CHECK-NEXT: [[Y:%.*]] = add i8 [[X:%.*]], 1
define {i8, i32} @aggr({i8, i32} noundef %x) {
; CHECK-LABEL: @aggr(
-; CHECK-NEXT: [[Y:%.*]] = freeze { i8, i32 } [[X:%.*]]
-; CHECK-NEXT: ret { i8, i32 } [[Y]]
+; CHECK-NEXT: ret { i8, i32 } [[X:%.*]]
;
%y = freeze {i8, i32} %x
ret {i8, i32} %y
}
+; TODO: should look into extract operations
define i32 @extract({i8, i32} noundef %x) {
; CHECK-LABEL: @extract(
; CHECK-NEXT: [[Y:%.*]] = extractvalue { i8, i32 } [[X:%.*]], 1
ret i32 %z
}
+; TODO: should look into extract operations
define i32 @extract2({i8, {i8, i32}} noundef %x) {
; CHECK-LABEL: @extract2(
; CHECK-NEXT: [[Y:%.*]] = extractvalue { i8, { i8, i32 } } [[X:%.*]], 1