From: Arthur Cohen <[email protected]>
And open Rust-GCC/gccrs#4949 as this means our regular casts from float to int
are
invalid and missing some extra checks.
gcc/rust/ChangeLog:
* backend/rust-compile-intrinsic.cc: Declare the new intrinsic.
* backend/rust-intrinsic-handlers.cc (float_to_int_unchecked): New
handler.
* backend/rust-intrinsic-handlers.h (float_to_int_unchecked): Declare
it.
* typecheck/rust-hir-type-check-intrinsic.cc: Add the intrinsic to the
typecheck
info.
* util/rust-intrinsic-values.h: New value for float_to_int_unchecked.
gcc/testsuite/ChangeLog:
* rust/execute/torture/float_to_int_unchecked.rs: New test.
Tested on x86_64-pc-linux-gnu.
---
gcc/rust/backend/rust-compile-intrinsic.cc | 1 +
gcc/rust/backend/rust-intrinsic-handlers.cc | 44 +++++++++++++++++++
gcc/rust/backend/rust-intrinsic-handlers.h | 3 ++
.../rust-hir-type-check-intrinsic.cc | 5 +++
gcc/rust/util/rust-intrinsic-values.h | 2 +
.../execute/torture/float_to_int_unchecked.rs | 22 ++++++++++
6 files changed, 77 insertions(+)
create mode 100644 gcc/testsuite/rust/execute/torture/float_to_int_unchecked.rs
diff --git a/gcc/rust/backend/rust-compile-intrinsic.cc
b/gcc/rust/backend/rust-compile-intrinsic.cc
index c16db442f3c..0202f493cc8 100644
--- a/gcc/rust/backend/rust-compile-intrinsic.cc
+++ b/gcc/rust/backend/rust-compile-intrinsic.cc
@@ -92,6 +92,7 @@ static const std::map<std::string, handlers::HandlerBuilder>
generic_intrinsics
handlers::fop_fast (ArithmeticOrLogicalOperator::DIVIDE)},
{IValue::FREM_FAST,
handlers::fop_fast (ArithmeticOrLogicalOperator::MODULUS)},
+ {IValue::FLOAT_TO_INT_UNCHECKED, handlers::float_to_int_unchecked},
};
Intrinsics::Intrinsics (Context *ctx) : ctx (ctx) {}
diff --git a/gcc/rust/backend/rust-intrinsic-handlers.cc
b/gcc/rust/backend/rust-intrinsic-handlers.cc
index 2d8dad76379..c07609891bd 100644
--- a/gcc/rust/backend/rust-intrinsic-handlers.cc
+++ b/gcc/rust/backend/rust-intrinsic-handlers.cc
@@ -2316,6 +2316,50 @@ assert_zero_valid_handler (Context *ctx, TyTy::FnType
*fntype, location_t)
return fndecl;
}
+tree
+float_to_int_unchecked (Context *ctx, TyTy::FnType *fntype, location_t loc)
+{
+ rust_assert (fntype->get_params ().size () == 1);
+ rust_assert (fntype->get_num_substitutions () == 2);
+
+ tree lookup = NULL_TREE;
+ if (check_for_cached_intrinsic (ctx, fntype, &lookup))
+ return lookup;
+
+ auto fndecl = compile_intrinsic_function (ctx, fntype);
+
+ auto &dst_param = fntype->get_substs ().at (1);
+ const auto dst_ty = dst_param.get_param_ty ();
+ auto int_ty_resolved = dst_ty->resolve ();
+
+ auto int_ty = TyTyResolveCompile::compile (ctx, int_ty_resolved);
+
+ // setup the params
+ std::vector<Bvariable *> param_vars;
+ compile_fn_params (ctx, fntype, fndecl, ¶m_vars);
+
+ rust_assert (param_vars.size () == 1);
+
+ auto &float_param = param_vars.at (0);
+
+ if (!Backend::function_set_parameters (fndecl, param_vars))
+ return error_mark_node;
+
+ enter_intrinsic_block (ctx, fndecl);
+
+ tree float_value = Backend::var_expression (float_param, UNDEF_LOCATION);
+
+ auto convert_expr = Backend::convert_expression (int_ty, float_value, loc);
+
+ auto return_statement = Backend::return_statement (fndecl, convert_expr,
loc);
+
+ ctx->add_statement (return_statement);
+
+ finalize_intrinsic_block (ctx, fndecl);
+
+ return fndecl;
+}
+
} // namespace handlers
} // namespace Compile
} // namespace Rust
diff --git a/gcc/rust/backend/rust-intrinsic-handlers.h
b/gcc/rust/backend/rust-intrinsic-handlers.h
index 6161b7fa2c4..bc668a7f140 100644
--- a/gcc/rust/backend/rust-intrinsic-handlers.h
+++ b/gcc/rust/backend/rust-intrinsic-handlers.h
@@ -112,6 +112,9 @@ tree assert_zero_valid_handler (Context *ctx, TyTy::FnType
*fntype,
*/
HandlerBuilder fop_fast (ArithmeticOrLogicalOperator op);
+tree float_to_int_unchecked (Context *ctx, TyTy::FnType *fntype,
+ location_t loc);
+
} // namespace handlers
} // namespace Compile
diff --git a/gcc/rust/typecheck/rust-hir-type-check-intrinsic.cc
b/gcc/rust/typecheck/rust-hir-type-check-intrinsic.cc
index 716df788055..1498a09c4da 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-intrinsic.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-intrinsic.cc
@@ -327,6 +327,11 @@ const std::unordered_map<std::string, IntrinsicRules>
{IValue::FREM_FAST,
{1, {IRT::FirstGeneric, IRT::FirstGeneric}, IRT::FirstGeneric}},
+ // fn float_to_int_unchecked<Float, Int>(x: Float) -> Int
+ // where Float: FloatPrimitive, Int: Copy
+ {IValue::FLOAT_TO_INT_UNCHECKED,
+ {2, {IRT::FirstGeneric}, IRT::SecondGeneric}},
+
};
IntrinsicCheckResult
diff --git a/gcc/rust/util/rust-intrinsic-values.h
b/gcc/rust/util/rust-intrinsic-values.h
index 9223e20abed..0da1f0c3ac3 100644
--- a/gcc/rust/util/rust-intrinsic-values.h
+++ b/gcc/rust/util/rust-intrinsic-values.h
@@ -181,6 +181,8 @@ public:
static constexpr auto &FMUL_FAST = "fmul_fast";
static constexpr auto &FDIV_FAST = "fdiv_fast";
static constexpr auto &FREM_FAST = "frem_fast";
+
+ static constexpr auto &FLOAT_TO_INT_UNCHECKED = "float_to_int_unchecked";
};
} // namespace Values
} // namespace Rust
diff --git a/gcc/testsuite/rust/execute/torture/float_to_int_unchecked.rs
b/gcc/testsuite/rust/execute/torture/float_to_int_unchecked.rs
new file mode 100644
index 00000000000..4f342c2919c
--- /dev/null
+++ b/gcc/testsuite/rust/execute/torture/float_to_int_unchecked.rs
@@ -0,0 +1,22 @@
+#![feature(no_core)]
+#![feature(intrinsics)]
+#![feature(lang_items)]
+#![no_core]
+
+#[lang = "sized"]
+trait Sized {}
+
+extern "rust-intrinsic" {
+ fn float_to_int_unchecked<Float, Int>(value: Float) -> Int;
+}
+
+fn main() -> i32 {
+ let a = 15.07;
+
+ let b = a as i32;
+ let c: i32 = unsafe { float_to_int_unchecked(a) };
+
+ // NOTE: This is only valid for certain floating point values as f32 ->
i32 conversions
+ // are different for invalid values when using the cast and when using the
unchecked intrinsic
+ b - c
+}
--
2.55.0
