[clang] ec32386 - [Clang] Support constexpr builtin fmin
Evgeny Shulgin via cfe-commits
cfe-commits at lists.llvm.org
Mon Oct 10 09:06:44 PDT 2022
Author: Evgeny Shulgin
Date: 2022-10-10T16:06:23Z
New Revision: ec32386404409b65d21fdf916110c08912335926
URL: https://github.com/llvm/llvm-project/commit/ec32386404409b65d21fdf916110c08912335926
DIFF: https://github.com/llvm/llvm-project/commit/ec32386404409b65d21fdf916110c08912335926.diff
LOG: [Clang] Support constexpr builtin fmin
Support constexpr version of __builtin_fmin and its variations.
Reviewed By: jcranmer-intel
Differential Revision: https://reviews.llvm.org/D135493
Added:
clang/test/Sema/constant-builtins-fmin.cpp
Modified:
clang/docs/LanguageExtensions.rst
clang/lib/AST/ExprConstant.cpp
Removed:
################################################################################
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index 0793523d91e55..f680b1f1d2ad7 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -4661,6 +4661,7 @@ The following builtin intrinsics can be used in constant expressions:
* ``__builtin_ffsl``
* ``__builtin_ffsll``
* ``__builtin_fmax``
+* ``__builtin_fmin``
* ``__builtin_fpclassify``
* ``__builtin_inf``
* ``__builtin_isinf``
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index f100a4e19f8ad..64c50c8b82e5a 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -14041,6 +14041,24 @@ bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) {
Result = RHS;
return true;
}
+
+ case Builtin::BI__builtin_fmin:
+ case Builtin::BI__builtin_fminf:
+ case Builtin::BI__builtin_fminl:
+ case Builtin::BI__builtin_fminf16:
+ case Builtin::BI__builtin_fminf128: {
+ // TODO: Handle sNaN.
+ APFloat RHS(0.);
+ if (!EvaluateFloat(E->getArg(0), Result, Info) ||
+ !EvaluateFloat(E->getArg(1), RHS, Info))
+ return false;
+ // When comparing zeroes, return -0.0 if one of the zeroes is negative.
+ if (Result.isZero() && RHS.isZero() && RHS.isNegative())
+ Result = RHS;
+ else if (Result.isNaN() || RHS < Result)
+ Result = RHS;
+ return true;
+ }
}
}
diff --git a/clang/test/Sema/constant-builtins-fmin.cpp b/clang/test/Sema/constant-builtins-fmin.cpp
new file mode 100644
index 0000000000000..bf3e81e21e617
--- /dev/null
+++ b/clang/test/Sema/constant-builtins-fmin.cpp
@@ -0,0 +1,54 @@
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+constexpr double NaN = __builtin_nan("");
+constexpr double Inf = __builtin_inf();
+constexpr double NegInf = -__builtin_inf();
+
+#define FMIN_TEST_SIMPLE(T, FUNC) \
+ static_assert(T(1.2345) == FUNC(T(1.2345), T(6.7890))); \
+ static_assert(T(1.2345) == FUNC(T(6.7890), T(1.2345)));
+
+#define FMIN_TEST_NAN(T, FUNC) \
+ static_assert(Inf == FUNC(NaN, Inf)); \
+ static_assert(NegInf == FUNC(NegInf, NaN)); \
+ static_assert(0.0 == FUNC(NaN, 0.0)); \
+ static_assert(-0.0 == FUNC(-0.0, NaN)); \
+ static_assert(T(-1.2345) == FUNC(NaN, T(-1.2345))); \
+ static_assert(T(1.2345) == FUNC(T(1.2345), NaN)); \
+ static_assert(__builtin_isnan(FUNC(NaN, NaN)));
+
+#define FMIN_TEST_INF(T, FUNC) \
+ static_assert(NegInf == FUNC(NegInf, Inf)); \
+ static_assert(0.0 == FUNC(Inf, 0.0)); \
+ static_assert(-0.0 == FUNC(-0.0, Inf)); \
+ static_assert(T(1.2345) == FUNC(Inf, T(1.2345))); \
+ static_assert(T(-1.2345) == FUNC(T(-1.2345), Inf));
+
+#define FMIN_TEST_NEG_INF(T, FUNC) \
+ static_assert(NegInf == FUNC(Inf, NegInf)); \
+ static_assert(NegInf == FUNC(NegInf, 0.0)); \
+ static_assert(NegInf == FUNC(-0.0, NegInf)); \
+ static_assert(NegInf == FUNC(NegInf, T(-1.2345))); \
+ static_assert(NegInf == FUNC(T(1.2345), NegInf));
+
+#define FMIN_TEST_BOTH_ZERO(T, FUNC) \
+ static_assert(__builtin_copysign(1.0, FUNC(0.0, 0.0)) == 1.0); \
+ static_assert(__builtin_copysign(1.0, FUNC(-0.0, 0.0)) == -1.0); \
+ static_assert(__builtin_copysign(1.0, FUNC(0.0, -0.0)) == -1.0); \
+ static_assert(__builtin_copysign(1.0, FUNC(-0.0, -0.0)) == -1.0);
+
+#define LIST_FMIN_TESTS(T, FUNC) \
+ FMIN_TEST_SIMPLE(T, FUNC) \
+ FMIN_TEST_NAN(T, FUNC) \
+ FMIN_TEST_INF(T, FUNC) \
+ FMIN_TEST_NEG_INF(T, FUNC) \
+ FMIN_TEST_BOTH_ZERO(T, FUNC)
+
+LIST_FMIN_TESTS(double, __builtin_fmin)
+LIST_FMIN_TESTS(float, __builtin_fminf)
+LIST_FMIN_TESTS((long double), __builtin_fminl)
+LIST_FMIN_TESTS(__fp16, __builtin_fminf16)
+#ifdef __FLOAT128__
+LIST_FMIN_TESTS(__float128, __builtin_fminf128)
+#endif
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