tbaeder updated this revision to Diff 465667.
tbaeder marked an inline comment as done.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D134749/new/
https://reviews.llvm.org/D134749
Files:
clang/lib/AST/Interp/ByteCodeExprGen.cpp
clang/lib/AST/Interp/Integral.h
clang/lib/AST/Interp/Interp.h
clang/lib/AST/Interp/Opcodes.td
clang/test/AST/Interp/literals.cpp
Index: clang/test/AST/Interp/literals.cpp
===================================================================
--- clang/test/AST/Interp/literals.cpp
+++ clang/test/AST/Interp/literals.cpp
@@ -174,3 +174,25 @@
// expected-note {{value 2147483648 is outside the range}} \
};
+
+namespace div {
+ constexpr int zero() { return 0; }
+ static_assert(12 / 3 == 4, "");
+ static_assert(12 / zero() == 12, ""); // ref-error {{not an integral constant expression}} \
+ // ref-note {{division by zero}} \
+ // expected-error {{not an integral constant expression}} \
+ // expected-note {{division by zero}}
+ static_assert(12 / -3 == -4, "");
+ static_assert(-12 / 3 == -4, "");
+
+
+ constexpr int LHS = 12;
+ constexpr long unsigned RHS = 3;
+ static_assert(LHS / RHS == 4, "");
+
+ constexpr int x = INT_MIN / - 1; // ref-error {{must be initialized by a constant expression}} \
+ // ref-note {{value 2147483648 is outside the range}} \
+ // expected-error {{must be initialized by a constant expression}} \
+ // expected-note {{value 2147483648 is outside the range}} \
+
+};
Index: clang/lib/AST/Interp/Opcodes.td
===================================================================
--- clang/lib/AST/Interp/Opcodes.td
+++ clang/lib/AST/Interp/Opcodes.td
@@ -401,7 +401,10 @@
let Types = [NumberTypeClass];
let HasGroup = 1;
}
-
+def Div : Opcode {
+ let Types = [NumberTypeClass];
+ let HasGroup = 1;
+}
//===----------------------------------------------------------------------===//
// Unary operators.
Index: clang/lib/AST/Interp/Interp.h
===================================================================
--- clang/lib/AST/Interp/Interp.h
+++ clang/lib/AST/Interp/Interp.h
@@ -186,6 +186,39 @@
return false;
}
+/// 1) Pops the RHS from the stack.
+/// 2) Pops the LHS from the stack.
+/// 3) Pushes 'LHS / RHS' on the stack
+template <PrimType Name, class T = typename PrimConv<Name>::T>
+bool Div(InterpState &S, CodePtr OpPC) {
+ const T &RHS = S.Stk.pop<T>();
+ const T &LHS = S.Stk.pop<T>();
+
+ if (RHS.isZero()) {
+ const SourceInfo &Loc = S.Current->getSource(OpPC);
+ S.FFDiag(Loc, diag::note_expr_divide_by_zero);
+ return false;
+ }
+
+ if (LHS.isSigned() && LHS.isMin() && RHS.isNegative() && RHS.isMinusOne()) {
+ APSInt LHSInt = LHS.toAPSInt();
+ SmallString<32> Trunc;
+ (-LHSInt.extend(LHSInt.getBitWidth() + 1)).toString(Trunc, 10);
+ const SourceInfo &Loc = S.Current->getSource(OpPC);
+ const Expr *E = S.Current->getExpr(OpPC);
+ S.CCEDiag(Loc, diag::note_constexpr_overflow) << Trunc << E->getType();
+ return false;
+ }
+
+ const unsigned Bits = RHS.bitWidth() * 2;
+ T Result;
+ if (!T::div(LHS, RHS, Bits, &Result)) {
+ S.Stk.push<T>(Result);
+ return true;
+ }
+ return false;
+}
+
//===----------------------------------------------------------------------===//
// Inv
//===----------------------------------------------------------------------===//
Index: clang/lib/AST/Interp/Integral.h
===================================================================
--- clang/lib/AST/Interp/Integral.h
+++ clang/lib/AST/Interp/Integral.h
@@ -215,6 +215,11 @@
return false;
}
+ static bool div(Integral A, Integral B, unsigned OpBits, Integral *R) {
+ *R = Integral(A.V / B.V);
+ return false;
+ }
+
static bool neg(Integral A, Integral *R) {
*R = -A;
return false;
Index: clang/lib/AST/Interp/ByteCodeExprGen.cpp
===================================================================
--- clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -213,6 +213,8 @@
return Discard(this->emitMul(*T, BO));
case BO_Rem:
return Discard(this->emitRem(*T, BO));
+ case BO_Div:
+ return Discard(this->emitDiv(*T, BO));
case BO_Assign:
if (!this->emitStore(*T, BO))
return false;
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