aboutsummaryrefslogtreecommitdiff
path: root/src/Sema.zig
diff options
context:
space:
mode:
Diffstat (limited to 'src/Sema.zig')
-rw-r--r--src/Sema.zig290
1 files changed, 120 insertions, 170 deletions
diff --git a/src/Sema.zig b/src/Sema.zig
index ded3999b84..fdf5eca764 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -17911,12 +17911,15 @@ fn cmpSelf(
const pt = sema.pt;
const zcu = pt.zcu;
const resolved_type = sema.typeOf(casted_lhs);
- const runtime_src: LazySrcLoc = src: {
- if (try sema.resolveValue(casted_lhs)) |lhs_val| {
- if (lhs_val.isUndef(zcu)) return pt.undefRef(Type.bool);
- if (try sema.resolveValue(casted_rhs)) |rhs_val| {
- if (rhs_val.isUndef(zcu)) return pt.undefRef(Type.bool);
+ const maybe_lhs_val = try sema.resolveValue(casted_lhs);
+ const maybe_rhs_val = try sema.resolveValue(casted_rhs);
+ if (maybe_lhs_val) |v| if (v.isUndef(zcu)) return pt.undefRef(Type.bool);
+ if (maybe_rhs_val) |v| if (v.isUndef(zcu)) return pt.undefRef(Type.bool);
+
+ const runtime_src: LazySrcLoc = src: {
+ if (maybe_lhs_val) |lhs_val| {
+ if (maybe_rhs_val) |rhs_val| {
if (resolved_type.zigTypeTag(zcu) == .vector) {
const cmp_val = try sema.compareVector(lhs_val, op, rhs_val, resolved_type);
return Air.internedToRef(cmp_val.toIntern());
@@ -17937,8 +17940,7 @@ fn cmpSelf(
// For bools, we still check the other operand, because we can lower
// bool eq/neq more efficiently.
if (resolved_type.zigTypeTag(zcu) == .bool) {
- if (try sema.resolveValue(casted_rhs)) |rhs_val| {
- if (rhs_val.isUndef(zcu)) return pt.undefRef(Type.bool);
+ if (maybe_rhs_val) |rhs_val| {
return sema.runtimeBoolCmp(block, src, op, casted_lhs, rhs_val.toBool(), lhs_src);
}
}
@@ -33837,51 +33839,61 @@ fn cmpNumeric(
else
uncasted_rhs;
- const runtime_src: LazySrcLoc = src: {
- if (try sema.resolveValue(lhs)) |lhs_val| {
- if (try sema.resolveValue(rhs)) |rhs_val| {
- // Compare ints: const vs. undefined (or vice versa)
- if (!lhs_val.isUndef(zcu) and (lhs_ty.isInt(zcu) or lhs_ty_tag == .comptime_int) and rhs_ty.isInt(zcu) and rhs_val.isUndef(zcu)) {
- if (try sema.compareIntsOnlyPossibleResult(try sema.resolveLazyValue(lhs_val), op, rhs_ty)) |res| {
- return if (res) .bool_true else .bool_false;
- }
- } else if (!rhs_val.isUndef(zcu) and (rhs_ty.isInt(zcu) or rhs_ty_tag == .comptime_int) and lhs_ty.isInt(zcu) and lhs_val.isUndef(zcu)) {
- if (try sema.compareIntsOnlyPossibleResult(try sema.resolveLazyValue(rhs_val), op.reverse(), lhs_ty)) |res| {
- return if (res) .bool_true else .bool_false;
- }
- }
+ const maybe_lhs_val = try sema.resolveValue(lhs);
+ const maybe_rhs_val = try sema.resolveValue(rhs);
- if (lhs_val.isUndef(zcu) or rhs_val.isUndef(zcu)) {
- return pt.undefRef(Type.bool);
- }
- if (lhs_val.isNan(zcu) or rhs_val.isNan(zcu)) {
- return if (op == std.math.CompareOperator.neq) .bool_true else .bool_false;
- }
- return if (try Value.compareHeteroSema(lhs_val, op, rhs_val, pt))
- .bool_true
- else
- .bool_false;
- } else {
- if (!lhs_val.isUndef(zcu) and (lhs_ty.isInt(zcu) or lhs_ty_tag == .comptime_int) and rhs_ty.isInt(zcu)) {
- // Compare ints: const vs. var
- if (try sema.compareIntsOnlyPossibleResult(try sema.resolveLazyValue(lhs_val), op, rhs_ty)) |res| {
- return if (res) .bool_true else .bool_false;
- }
- }
- break :src rhs_src;
- }
- } else {
- if (try sema.resolveValueResolveLazy(rhs)) |rhs_val| {
- if (!rhs_val.isUndef(zcu) and (rhs_ty.isInt(zcu) or rhs_ty_tag == .comptime_int) and lhs_ty.isInt(zcu)) {
- // Compare ints: var vs. const
- if (try sema.compareIntsOnlyPossibleResult(try sema.resolveLazyValue(rhs_val), op.reverse(), lhs_ty)) |res| {
- return if (res) .bool_true else .bool_false;
- }
- }
- }
- break :src lhs_src;
- }
- };
+ // If the LHS is const, check if there is a guaranteed result which does not depend on ths RHS value.
+ if (maybe_lhs_val) |lhs_val| {
+ // Result based on comparison exceeding type bounds
+ if (!lhs_val.isUndef(zcu) and (lhs_ty_tag == .int or lhs_ty_tag == .comptime_int) and rhs_ty.isInt(zcu)) {
+ if (try sema.compareIntsOnlyPossibleResult(lhs_val, op, rhs_ty)) |res| {
+ return if (res) .bool_true else .bool_false;
+ }
+ }
+ // Result based on NaN comparison
+ if (lhs_val.isNan(zcu)) {
+ return if (op == .neq) .bool_true else .bool_false;
+ }
+ // Result based on inf comparison to int
+ if (lhs_val.isInf(zcu) and rhs_ty_tag == .int) return switch (op) {
+ .neq => .bool_true,
+ .eq => .bool_false,
+ .gt, .gte => if (lhs_val.isNegativeInf(zcu)) .bool_false else .bool_true,
+ .lt, .lte => if (lhs_val.isNegativeInf(zcu)) .bool_true else .bool_false,
+ };
+ }
+
+ // If the RHS is const, check if there is a guaranteed result which does not depend on ths LHS value.
+ if (maybe_rhs_val) |rhs_val| {
+ // Result based on comparison exceeding type bounds
+ if (!rhs_val.isUndef(zcu) and (rhs_ty_tag == .int or rhs_ty_tag == .comptime_int) and lhs_ty.isInt(zcu)) {
+ if (try sema.compareIntsOnlyPossibleResult(rhs_val, op.reverse(), lhs_ty)) |res| {
+ return if (res) .bool_true else .bool_false;
+ }
+ }
+ // Result based on NaN comparison
+ if (rhs_val.isNan(zcu)) {
+ return if (op == .neq) .bool_true else .bool_false;
+ }
+ // Result based on inf comparison to int
+ if (rhs_val.isInf(zcu) and lhs_ty_tag == .int) return switch (op) {
+ .neq => .bool_true,
+ .eq => .bool_false,
+ .gt, .gte => if (rhs_val.isNegativeInf(zcu)) .bool_true else .bool_false,
+ .lt, .lte => if (rhs_val.isNegativeInf(zcu)) .bool_false else .bool_true,
+ };
+ }
+
+ // Any other comparison depends on both values, so the result is undef if either is undef.
+ if (maybe_lhs_val) |v| if (v.isUndef(zcu)) return pt.undefRef(Type.bool);
+ if (maybe_rhs_val) |v| if (v.isUndef(zcu)) return pt.undefRef(Type.bool);
+
+ const runtime_src: LazySrcLoc = if (maybe_lhs_val) |lhs_val| rs: {
+ if (maybe_rhs_val) |rhs_val| {
+ const res = try Value.compareHeteroSema(lhs_val, op, rhs_val, pt);
+ return if (res) .bool_true else .bool_false;
+ } else break :rs rhs_src;
+ } else lhs_src;
// TODO handle comparisons against lazy zero values
// Some values can be compared against zero without being runtime-known or without forcing
@@ -33919,17 +33931,18 @@ fn cmpNumeric(
const casted_rhs = try sema.coerce(block, dest_ty, rhs, rhs_src);
return block.addBinOp(Air.Inst.Tag.fromCmpOp(op, block.float_mode == .optimized), casted_lhs, casted_rhs);
}
+
// For mixed unsigned integer sizes, implicit cast both operands to the larger integer.
// For mixed signed and unsigned integers, implicit cast both operands to a signed
// integer with + 1 bit.
// For mixed floats and integers, extract the integer part from the float, cast that to
// a signed integer with mantissa bits + 1, and if there was any non-integral part of the float,
// add/subtract 1.
- const lhs_is_signed = if (try sema.resolveDefinedValue(block, lhs_src, lhs)) |lhs_val|
+ const lhs_is_signed = if (maybe_lhs_val) |lhs_val|
!(try lhs_val.compareAllWithZeroSema(.gte, pt))
else
(lhs_ty.isRuntimeFloat() or lhs_ty.isSignedInt(zcu));
- const rhs_is_signed = if (try sema.resolveDefinedValue(block, rhs_src, rhs)) |rhs_val|
+ const rhs_is_signed = if (maybe_rhs_val) |rhs_val|
!(try rhs_val.compareAllWithZeroSema(.gte, pt))
else
(rhs_ty.isRuntimeFloat() or rhs_ty.isSignedInt(zcu));
@@ -33938,19 +33951,8 @@ fn cmpNumeric(
var dest_float_type: ?Type = null;
var lhs_bits: usize = undefined;
- if (try sema.resolveValueResolveLazy(lhs)) |lhs_val| {
- if (lhs_val.isUndef(zcu))
- return pt.undefRef(Type.bool);
- if (lhs_val.isNan(zcu)) switch (op) {
- .neq => return .bool_true,
- else => return .bool_false,
- };
- if (lhs_val.isInf(zcu)) switch (op) {
- .neq => return .bool_true,
- .eq => return .bool_false,
- .gt, .gte => return if (lhs_val.isNegativeInf(zcu)) .bool_false else .bool_true,
- .lt, .lte => return if (lhs_val.isNegativeInf(zcu)) .bool_true else .bool_false,
- };
+ if (maybe_lhs_val) |unresolved_lhs_val| {
+ const lhs_val = try sema.resolveLazyValue(unresolved_lhs_val);
if (!rhs_is_signed) {
switch (lhs_val.orderAgainstZero(zcu)) {
.gt => {},
@@ -33996,19 +33998,8 @@ fn cmpNumeric(
}
var rhs_bits: usize = undefined;
- if (try sema.resolveValueResolveLazy(rhs)) |rhs_val| {
- if (rhs_val.isUndef(zcu))
- return pt.undefRef(Type.bool);
- if (rhs_val.isNan(zcu)) switch (op) {
- .neq => return .bool_true,
- else => return .bool_false,
- };
- if (rhs_val.isInf(zcu)) switch (op) {
- .neq => return .bool_true,
- .eq => return .bool_false,
- .gt, .gte => return if (rhs_val.isNegativeInf(zcu)) .bool_true else .bool_false,
- .lt, .lte => return if (rhs_val.isNegativeInf(zcu)) .bool_false else .bool_true,
- };
+ if (maybe_rhs_val) |unresolved_rhs_val| {
+ const rhs_val = try sema.resolveLazyValue(unresolved_rhs_val);
if (!lhs_is_signed) {
switch (rhs_val.orderAgainstZero(zcu)) {
.gt => {},
@@ -34075,90 +34066,49 @@ fn compareIntsOnlyPossibleResult(
lhs_val: Value,
op: std.math.CompareOperator,
rhs_ty: Type,
-) Allocator.Error!?bool {
+) SemaError!?bool {
const pt = sema.pt;
const zcu = pt.zcu;
- const rhs_info = rhs_ty.intInfo(zcu);
- const vs_zero = lhs_val.orderAgainstZeroSema(pt) catch unreachable;
- const is_zero = vs_zero == .eq;
- const is_negative = vs_zero == .lt;
- const is_positive = vs_zero == .gt;
- // Anything vs. zero-sized type has guaranteed outcome.
- if (rhs_info.bits == 0) return switch (op) {
- .eq, .lte, .gte => is_zero,
- .neq, .lt, .gt => !is_zero,
- };
+ const min_rhs = try rhs_ty.minInt(pt, rhs_ty);
+ const max_rhs = try rhs_ty.maxInt(pt, rhs_ty);
- // Special case for i1, which can only be 0 or -1.
- // Zero and positive ints have guaranteed outcome.
- if (rhs_info.bits == 1 and rhs_info.signedness == .signed) {
- if (is_positive) return switch (op) {
- .gt, .gte, .neq => true,
- .lt, .lte, .eq => false,
- };
- if (is_zero) return switch (op) {
- .gte => true,
- .lt => false,
- .gt, .lte, .eq, .neq => null,
- };
+ if (min_rhs.toIntern() == max_rhs.toIntern()) {
+ // RHS is effectively comptime-known.
+ return try Value.compareHeteroSema(lhs_val, op, min_rhs, pt);
}
- // Negative vs. unsigned has guaranteed outcome.
- if (rhs_info.signedness == .unsigned and is_negative) return switch (op) {
- .eq, .gt, .gte => false,
- .neq, .lt, .lte => true,
- };
-
- const sign_adj = @intFromBool(!is_negative and rhs_info.signedness == .signed);
- const req_bits = lhs_val.intBitCountTwosComp(zcu) + sign_adj;
-
- // No sized type can have more than 65535 bits.
- // The RHS type operand is either a runtime value or sized (but undefined) constant.
- if (req_bits > 65535) return switch (op) {
- .lt, .lte => is_negative,
- .gt, .gte => is_positive,
- .eq => false,
- .neq => true,
- };
- const fits = req_bits <= rhs_info.bits;
+ const against_min = try lhs_val.orderAdvanced(min_rhs, .sema, zcu, pt.tid);
+ const against_max = try lhs_val.orderAdvanced(max_rhs, .sema, zcu, pt.tid);
- // Oversized int has guaranteed outcome.
switch (op) {
- .eq => return if (!fits) false else null,
- .neq => return if (!fits) true else null,
- .lt, .lte => if (!fits) return is_negative,
- .gt, .gte => if (!fits) return !is_negative,
+ .eq => {
+ if (against_min.compare(.lt)) return false;
+ if (against_max.compare(.gt)) return false;
+ },
+ .neq => {
+ if (against_min.compare(.lt)) return true;
+ if (against_max.compare(.gt)) return true;
+ },
+ .lt => {
+ if (against_min.compare(.lt)) return true;
+ if (against_max.compare(.gte)) return false;
+ },
+ .gt => {
+ if (against_max.compare(.gt)) return true;
+ if (against_min.compare(.lte)) return false;
+ },
+ .lte => {
+ if (against_min.compare(.lte)) return true;
+ if (against_max.compare(.gt)) return false;
+ },
+ .gte => {
+ if (against_max.compare(.gte)) return true;
+ if (against_min.compare(.lt)) return false;
+ },
}
- // For any other comparison, we need to know if the LHS value is
- // equal to the maximum or minimum possible value of the RHS type.
- const is_min, const is_max = edge: {
- if (is_zero and rhs_info.signedness == .unsigned) break :edge .{ true, false };
-
- if (req_bits != rhs_info.bits) break :edge .{ false, false };
-
- const ty = try pt.intType(
- if (is_negative) .signed else .unsigned,
- @intCast(req_bits),
- );
- const pop_count = lhs_val.popCount(ty, zcu);
-
- if (is_negative) {
- break :edge .{ pop_count == 1, false };
- } else {
- break :edge .{ false, pop_count == req_bits - sign_adj };
- }
- };
-
- assert(fits);
- return switch (op) {
- .lt => if (is_max) false else null,
- .lte => if (is_min) true else null,
- .gt => if (is_min) false else null,
- .gte => if (is_max) true else null,
- .eq, .neq => unreachable,
- };
+ return null;
}
/// Asserts that lhs and rhs types are both vectors.
@@ -34189,21 +34139,17 @@ fn cmpVector(
.child = .bool_type,
});
- const runtime_src: LazySrcLoc = src: {
- if (try sema.resolveValue(casted_lhs)) |lhs_val| {
- if (try sema.resolveValue(casted_rhs)) |rhs_val| {
- if (lhs_val.isUndef(zcu) or rhs_val.isUndef(zcu)) {
- return pt.undefRef(result_ty);
- }
- const cmp_val = try sema.compareVector(lhs_val, op, rhs_val, resolved_ty);
- return Air.internedToRef(cmp_val.toIntern());
- } else {
- break :src rhs_src;
- }
- } else {
- break :src lhs_src;
- }
- };
+ const maybe_lhs_val = try sema.resolveValue(casted_lhs);
+ const maybe_rhs_val = try sema.resolveValue(casted_rhs);
+ if (maybe_lhs_val) |v| if (v.isUndef(zcu)) return pt.undefRef(result_ty);
+ if (maybe_rhs_val) |v| if (v.isUndef(zcu)) return pt.undefRef(result_ty);
+
+ const runtime_src: LazySrcLoc = if (maybe_lhs_val) |lhs_val| src: {
+ if (maybe_rhs_val) |rhs_val| {
+ const cmp_val = try sema.compareVector(lhs_val, op, rhs_val, resolved_ty);
+ return Air.internedToRef(cmp_val.toIntern());
+ } else break :src rhs_src;
+ } else lhs_src;
try sema.requireRuntimeBlock(block, src, runtime_src);
return block.addCmpVector(casted_lhs, casted_rhs, op);
@@ -38691,8 +38637,12 @@ fn compareVector(
for (result_data, 0..) |*scalar, i| {
const lhs_elem = try lhs.elemValue(pt, i);
const rhs_elem = try rhs.elemValue(pt, i);
- const res_bool = try sema.compareScalar(lhs_elem, op, rhs_elem, ty.scalarType(zcu));
- scalar.* = Value.makeBool(res_bool).toIntern();
+ if (lhs_elem.isUndef(zcu) or rhs_elem.isUndef(zcu)) {
+ scalar.* = try pt.intern(.{ .undef = .bool_type });
+ } else {
+ const res_bool = try sema.compareScalar(lhs_elem, op, rhs_elem, ty.scalarType(zcu));
+ scalar.* = Value.makeBool(res_bool).toIntern();
+ }
}
return Value.fromInterned(try pt.intern(.{ .aggregate = .{
.ty = (try pt.vectorType(.{ .len = ty.vectorLen(zcu), .child = .bool_type })).toIntern(),
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-27 21:13:47 +0000