Clang: Support minimumnum and maximumnum intrinsics (llvm#96281)

We just introduce llvm.minimumnum and llvm.maximumnum intrinsics support
to llvm. Let's support them in Clang.

See: llvm#93033

clang/include/clang/Basic/Builtins.td

@@ -215,6 +215,18 @@ def FminF16F128 : Builtin, F16F128MathTemplate {
   let Prototype = "T(T, T)";
 }
 
+def FmaximumNumF16F128 : Builtin, F16F128MathTemplate {
+  let Spellings = ["__builtin_fmaximum_num"];
+  let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const, Constexpr];
+  let Prototype = "T(T, T)";
+}
+
+def FminimumNumF16F128 : Builtin, F16F128MathTemplate {
+  let Spellings = ["__builtin_fminimum_num"];
+  let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const, Constexpr];
+  let Prototype = "T(T, T)";
+}
+
 def Atan2F128 : Builtin {
   let Spellings = ["__builtin_atan2f128"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow, ConstIgnoringErrnoAndExceptions];
@@ -3728,6 +3740,22 @@ def Fmin : FPMathTemplate, LibBuiltin<"math.h"> {
   let OnlyBuiltinPrefixedAliasIsConstexpr = 1;
 }
 
+def FmaximumNum : FPMathTemplate, LibBuiltin<"math.h"> {
+  let Spellings = ["fmaximum_num"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "T(T, T)";
+  let AddBuiltinPrefixedAlias = 1;
+  let OnlyBuiltinPrefixedAliasIsConstexpr = 1;
+}
+
+def FminimumNum : FPMathTemplate, LibBuiltin<"math.h"> {
+  let Spellings = ["fminimum_num"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "T(T, T)";
+  let AddBuiltinPrefixedAlias = 1;
+  let OnlyBuiltinPrefixedAliasIsConstexpr = 1;
+}
+
 def Hypot : FPMathTemplate, LibBuiltin<"math.h"> {
   let Spellings = ["hypot"];
   let Attributes = [NoThrow, ConstIgnoringErrnoAndExceptions];

clang/lib/AST/ExprConstant.cpp

@@ -15310,6 +15310,32 @@ bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) {
       Result = RHS;
     return true;
   }
+
+  case Builtin::BI__builtin_fmaximum_num:
+  case Builtin::BI__builtin_fmaximum_numf:
+  case Builtin::BI__builtin_fmaximum_numl:
+  case Builtin::BI__builtin_fmaximum_numf16:
+  case Builtin::BI__builtin_fmaximum_numf128: {
+    APFloat RHS(0.);
+    if (!EvaluateFloat(E->getArg(0), Result, Info) ||
+        !EvaluateFloat(E->getArg(1), RHS, Info))
+      return false;
+    Result = maximumnum(Result, RHS);
+    return true;
+  }
+
+  case Builtin::BI__builtin_fminimum_num:
+  case Builtin::BI__builtin_fminimum_numf:
+  case Builtin::BI__builtin_fminimum_numl:
+  case Builtin::BI__builtin_fminimum_numf16:
+  case Builtin::BI__builtin_fminimum_numf128: {
+    APFloat RHS(0.);
+    if (!EvaluateFloat(E->getArg(0), Result, Info) ||
+        !EvaluateFloat(E->getArg(1), RHS, Info))
+      return false;
+    Result = minimumnum(Result, RHS);
+    return true;
+  }
   }
 }
 

clang/lib/CodeGen/CGBuiltin.cpp

@@ -2869,6 +2869,28 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
                                    Intrinsic::minnum,
                                    Intrinsic::experimental_constrained_minnum));
 
+    case Builtin::BIfmaximum_num:
+    case Builtin::BIfmaximum_numf:
+    case Builtin::BIfmaximum_numl:
+    case Builtin::BI__builtin_fmaximum_num:
+    case Builtin::BI__builtin_fmaximum_numf:
+    case Builtin::BI__builtin_fmaximum_numf16:
+    case Builtin::BI__builtin_fmaximum_numl:
+    case Builtin::BI__builtin_fmaximum_numf128:
+      return RValue::get(
+          emitBuiltinWithOneOverloadedType<2>(*this, E, Intrinsic::maximumnum));
+
+    case Builtin::BIfminimum_num:
+    case Builtin::BIfminimum_numf:
+    case Builtin::BIfminimum_numl:
+    case Builtin::BI__builtin_fminimum_num:
+    case Builtin::BI__builtin_fminimum_numf:
+    case Builtin::BI__builtin_fminimum_numf16:
+    case Builtin::BI__builtin_fminimum_numl:
+    case Builtin::BI__builtin_fminimum_numf128:
+      return RValue::get(
+          emitBuiltinWithOneOverloadedType<2>(*this, E, Intrinsic::minimumnum));
+
     // fmod() is a special-case. It maps to the frem instruction rather than an
     // LLVM intrinsic.
     case Builtin::BIfmod:

clang/test/CodeGen/builtins.c

@@ -69,6 +69,13 @@ int main(void) {
   P(issignaling, (1.));
   P(isfpclass, (1., 1));
 
+  Q(fmaximum_num, (1.0, 2.0));
+  Q(fmaximum_numf, (1.0, 2.0));
+  Q(fmaximum_numl, (1.0, 2.0));
+  Q(fminimum_num, (1.0, 2.0));
+  Q(fminimum_numf, (1.0, 2.0));
+  Q(fminimum_numl, (1.0, 2.0));
+
   // Bitwise & Numeric Functions
 
   P(abs, (N));
@@ -305,7 +312,7 @@ void test_float_builtins(__fp16 *H, float F, double D, long double LD) {
 }
 
 // CHECK-LABEL: define{{.*}} void @test_float_builtin_ops
-void test_float_builtin_ops(float F, double D, long double LD) {
+void test_float_builtin_ops(float F, double D, long double LD, int I) {
   volatile float resf;
   volatile double resd;
   volatile long double resld;
@@ -353,6 +360,58 @@ void test_float_builtin_ops(float F, double D, long double LD) {
   resld = __builtin_fmaxl(LD, LD);
   // CHECK: call x86_fp80 @llvm.maxnum.f80
 
+  resf = __builtin_fminimum_numf(F, F);
+  // CHECK: call float @llvm.minimumnum.f32
+
+  resf = __builtin_fminimum_numf(I, I);
+  // CHECK: sitofp i32 {{%[0-9]+}} to float
+  // CHECK: sitofp i32 {{%[0-9]+}} to float
+  // CHECK: call float @llvm.minimumnum.f32
+
+  resf = __builtin_fminimum_numf(1.0, 2.0);
+  // CHECK: store volatile float 1.000000e+00, ptr %resf
+
+  resd = __builtin_fminimum_num(D, D);
+  // CHECK: call double @llvm.minimumnum.f64
+
+  resd = __builtin_fminimum_num(I, I);
+  // CHECK: sitofp i32 {{%[0-9]+}} to double
+  // CHECK: sitofp i32 {{%[0-9]+}} to double
+  // CHECK: call double @llvm.minimumnum.f64
+
+  resd = __builtin_fminimum_num(1.0, 2.0);
+  // CHECK: store volatile double 1.000000e+00, ptr %resd
+
+  //FIXME: __builtin_fminimum_numl is not supported well yet.
+  resld = __builtin_fminimum_numl(1.0, 2.0);
+  // CHECK: store volatile x86_fp80 0xK3FFF8000000000000000, ptr %resld, align 16
+
+  resf = __builtin_fmaximum_numf(F, F);
+  // CHECK: call float @llvm.maximumnum.f32
+
+  resf = __builtin_fmaximum_numf(I, I);
+  // CHECK: sitofp i32 {{%[0-9]+}} to float
+  // CHECK: sitofp i32 {{%[0-9]+}} to float
+  // CHECK: call float @llvm.maximumnum.f32
+
+  resf = __builtin_fmaximum_numf(1.0, 2.0);
+  // CHECK: store volatile float 2.000000e+00, ptr %resf
+
+  resd = __builtin_fmaximum_num(D, D);
+  // CHECK: call double @llvm.maximumnum.f64
+
+  resd = __builtin_fmaximum_num(I, I);
+  // CHECK: sitofp i32 {{%[0-9]+}} to double
+  // CHECK: sitofp i32 {{%[0-9]+}} to double
+  // CHECK: call double @llvm.maximumnum.f64
+
+  resd = __builtin_fmaximum_num(1.0, 2.0);
+  // CHECK: store volatile double 2.000000e+00, ptr %resd
+
+  //FIXME: __builtin_fmaximum_numl is not supported well yet.
+  resld = __builtin_fmaximum_numl(1.0, 2.0);
+  // CHECK: store volatile x86_fp80 0xK40008000000000000000, ptr %resld, align 16
+
   resf = __builtin_fabsf(F);
   // CHECK: call float @llvm.fabs.f32
 

clang/test/CodeGen/fmaxfmin-invalid-arguments-type.c

@@ -0,0 +1,33 @@
+// RUN: not %clang_cc1 -triple x86_64 %s -fsyntax-only -verify 2>&1 | FileCheck %s --check-prefix=CHECK-ERR
+
+float fminimum_numf (float, float);
+double fminimum_num (double, double);
+long double fminimum_numl (long double, long double);
+float fmaximum_numf (float, float);
+double fmaximum_num (double, double);
+long double fmaximum_numl (long double, long double);
+
+// CHECK-ERR: passing 'char *' to parameter of incompatible type 'float'
+float fmin1(char *a, char *b) {
+        return fminimum_numf(a, b);
+}
+// CHECK-ERR: passing 'char *' to parameter of incompatible type 'double'
+float fmin2(char *a, char *b) {
+        return fminimum_num(a, b);
+}
+// CHECK-ERR: passing 'char *' to parameter of incompatible type 'long double'
+float fmin3(char *a, char *b) {
+        return fminimum_numl(a, b);
+}
+// CHECK-ERR: passing 'char *' to parameter of incompatible type 'float'
+float fmax1(char *a, char *b) {
+        return fmaximum_numf(a, b);
+}
+// CHECK-ERR: passing 'char *' to parameter of incompatible type 'double'
+float fmax2(char *a, char *b) {
+        return fmaximum_num(a, b);
+}
+// CHECK-ERR: passing 'char *' to parameter of incompatible type 'long double'
+float fmax3(char *a, char *b) {
+        return fmaximum_numl(a, b);
+}

clang/test/CodeGen/math-libcalls.c

@@ -1,8 +1,8 @@
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm %s | FileCheck %s --check-prefix=NO__ERRNO
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm -fmath-errno %s | FileCheck %s --check-prefix=HAS_ERRNO
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm -disable-llvm-passes -O2 %s | FileCheck %s --check-prefix=NO__ERRNO
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm -disable-llvm-passes -O2 -fmath-errno %s | FileCheck %s --check-prefix=HAS_ERRNO
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm -ffp-exception-behavior=maytrap %s | FileCheck %s --check-prefix=HAS_MAYTRAP
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm %s | FileCheck %s --check-prefixes=COMMON,NO__ERRNO
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm -fmath-errno %s | FileCheck %s --check-prefixes=COMMON,HAS_ERRNO
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm -disable-llvm-passes -O2 %s | FileCheck %s --check-prefixes=COMMON,NO__ERRNO
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm -disable-llvm-passes -O2 -fmath-errno %s | FileCheck %s --check-prefixes=COMMON,HAS_ERRNO
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -Wno-implicit-function-declaration -w -o - -emit-llvm -ffp-exception-behavior=maytrap %s | FileCheck %s --check-prefixes=COMMON,HAS_MAYTRAP
 // RUN: %clang_cc1 -triple x86_64-unknown-unknown-gnu -Wno-implicit-function-declaration -w -o - -emit-llvm -fmath-errno %s | FileCheck %s --check-prefix=HAS_ERRNO_GNU
 // RUN: %clang_cc1 -triple x86_64-unknown-windows-msvc -Wno-implicit-function-declaration -w -o - -emit-llvm -fmath-errno %s | FileCheck %s --check-prefix=HAS_ERRNO_WIN
 
@@ -372,6 +372,18 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
 // HAS_MAYTRAP: declare float @llvm.experimental.constrained.minnum.f32(
 // HAS_MAYTRAP: declare x86_fp80 @llvm.experimental.constrained.minnum.f80(
 
+  fmaximum_num(*d,*d);       fmaximum_numf(f,f);      fmaximum_numl(*l,*l);
+
+// COMMON: declare double @llvm.maximumnum.f64(double, double) [[READNONE_INTRINSIC]]
+// COMMON: declare float @llvm.maximumnum.f32(float, float) [[READNONE_INTRINSIC]]
+// COMMON: declare x86_fp80 @llvm.maximumnum.f80(x86_fp80, x86_fp80) [[READNONE_INTRINSIC]]
+
+  fminimum_num(*d,*d);       fminimum_numf(f,f);      fminimum_numl(*l,*l);
+
+// COMMON: declare double @llvm.minimumnum.f64(double, double) [[READNONE_INTRINSIC]]
+// COMMON: declare float @llvm.minimumnum.f32(float, float) [[READNONE_INTRINSIC]]
+// COMMON: declare x86_fp80 @llvm.minimumnum.f80(x86_fp80, x86_fp80) [[READNONE_INTRINSIC]]
+
   hypot(f,f);      hypotf(f,f);     hypotl(f,f);
 
 // NO__ERRNO: declare double @hypot(double noundef, double noundef) [[READNONE]]

clang/test/Preprocessor/feature_tests.cpp

@@ -58,7 +58,9 @@
 
 // Check __has_constexpr_builtin
 #if  !__has_constexpr_builtin(__builtin_fmax) || \
-     !__has_constexpr_builtin(__builtin_fmin)
+     !__has_constexpr_builtin(__builtin_fmin) || \
+     !__has_constexpr_builtin(__builtin_fmaximum_num) || \
+     !__has_constexpr_builtin(__builtin_fminimum_num)
 #error Clang should have these constexpr builtins
 #endif
 

clang/test/Sema/constant-builtins-fmaximum-num.cpp

@@ -0,0 +1,69 @@
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify %s
+// FIXME: %clang_cc1 -std=c++17 -fsyntax-only -verify -fexperimental-new-constant-interpreter %s
+// expected-no-diagnostics
+
+constexpr double NaN = __builtin_nan("");
+constexpr double SNaN = __builtin_nans("");
+constexpr double Inf = __builtin_inf();
+constexpr double NegInf = -__builtin_inf();
+
+#define FMAXIMUMNUM_TEST_SIMPLE(T, FUNC)                           \
+    static_assert(T(6.7890) == FUNC(T(1.2345), T(6.7890))); \
+    static_assert(T(6.7890) == FUNC(T(6.7890), T(1.2345)));
+
+#define FMAXIMUMNUM_TEST_SNAN(T, FUNC)                          \
+    static_assert(Inf == FUNC(SNaN, Inf));               \
+    static_assert(NegInf == FUNC(NegInf, SNaN));         \
+    static_assert(0.0 == FUNC(SNaN, 0.0));               \
+    static_assert(-0.0 == FUNC(-0.0, SNaN));             \
+    static_assert(T(-1.2345) == FUNC(SNaN, T(-1.2345))); \
+    static_assert(T(1.2345) == FUNC(T(1.2345), SNaN));   \
+    static_assert(__builtin_isnan(FUNC(SNaN, SNaN)));    \
+    static_assert(__builtin_isnan(FUNC(NaN, SNaN)));    \
+    static_assert(!__builtin_issignaling(FUNC(SNaN, SNaN)));  \
+    static_assert(!__builtin_issignaling(FUNC(NaN, SNaN)));
+
+#define FMAXIMUMNUM_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 FMAXIMUMNUM_TEST_INF(T, FUNC)                  \
+    static_assert(Inf == FUNC(NegInf, Inf));    \
+    static_assert(Inf == FUNC(Inf, 0.0));       \
+    static_assert(Inf == FUNC(-0.0, Inf));      \
+    static_assert(Inf == FUNC(Inf, T(1.2345))); \
+    static_assert(Inf == FUNC(T(-1.2345), Inf));
+
+#define FMAXIMUMNUM_TEST_NEG_INF(T, FUNC)                         \
+    static_assert(Inf == FUNC(Inf, NegInf));               \
+    static_assert(0.0 == FUNC(NegInf, 0.0));               \
+    static_assert(-0.0 == FUNC(-0.0, NegInf));             \
+    static_assert(T(-1.2345) == FUNC(NegInf, T(-1.2345))); \
+    static_assert(T(1.2345) == FUNC(T(1.2345), NegInf));
+
+#define FMAXIMUMNUM_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_FMAXIMUMNUM_TESTS(T, FUNC) \
+    FMAXIMUMNUM_TEST_SIMPLE(T, FUNC)    \
+    FMAXIMUMNUM_TEST_NAN(T, FUNC)       \
+    FMAXIMUMNUM_TEST_SNAN(T, FUNC)       \
+    FMAXIMUMNUM_TEST_INF(T, FUNC)       \
+    FMAXIMUMNUM_TEST_NEG_INF(T, FUNC)   \
+    FMAXIMUMNUM_TEST_BOTH_ZERO(T, FUNC)
+
+LIST_FMAXIMUMNUM_TESTS(double, __builtin_fmaximum_num)
+LIST_FMAXIMUMNUM_TESTS(float, __builtin_fmaximum_numf)
+LIST_FMAXIMUMNUM_TESTS((long double), __builtin_fmaximum_numl)
+LIST_FMAXIMUMNUM_TESTS(__fp16, __builtin_fmaximum_numf16)
+#ifdef __FLOAT128__
+LIST_FMAXIMUMNUM_TESTS(__float128, __builtin_fmaximum_numf128)
+#endif