[FPEnv] clang support for constrained FP builtins

[kpn]

Summary

Currently if constrained fp math is requested clang is still emitting calls to the non-constrained versions of math builtins. This patch corrects that for calls that are not target-specific.

I really wanted to keep constrained/non-constrained decisions in the IRBuilder, but that causes complications. This version stays close to that ideal without the complications.

[rjmccall]

clang/lib/CodeGen/CGBuiltin.cpp

357

I don't see any situation where not_intrinsic is passed in here; why all these checks?

2297

What can this not use the standard path?

[kpn]

D62731 is required for testing this patch.

[kpn]

clang/lib/CodeGen/CGBuiltin.cpp

357

I tend to be conservative, and I'm not good at predicting the future. I can remove the checks easily in the next round.

2297

I'll take another look. It wasn't using the standard path before so I made my added code match. If it can use the standard path in both cases then maybe it should?

[rjmccall]

clang/lib/CodeGen/CGBuiltin.cpp

357

I just can't imagine why you would ever call this function without a constrained intrinsic ID when its only purpose is to choose between a constrained and unconstrained intrinsic. It's always better to start with stronger preconditions and then generalize later if necessary.

2297

Yeah. It's possible the type-heterogeneity (the power always being an int) stops that from working for some reason, but if not, it's always nicer to re-use more code.

[kpn]

Update for review comments.

[rjmccall]

Thanks, LGTM.

clang/lib/CodeGen/CGBuiltin.cpp

static Value *EmitISOVolatileStore(CodeGenFunction &CGF, const CallExpr *E) {
   Ptr = CGF.Builder.CreateBitCast(Ptr, ITy->getPointerTo());
   llvm::StoreInst *Store =
       CGF.Builder.CreateAlignedStore(Value, Ptr, StoreSize);
   Store->setVolatile(true);
   return Store;
 }
 
 // Emit a simple mangled intrinsic that has 1 argument and a return type
+// matching the argument type. Depending on mode, this may be a constrained
+// floating-point intrinsic.
+static Value *emitUnaryMaybeConstrainedFPBuiltin(CodeGenFunction &CGF,
+                                const CallExpr *E, unsigned IntrinsicID,
+                                unsigned ConstrainedIntrinsicID) {
+  llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
+
+  if (CGF.Builder.getIsFPConstrained()) {
+    Value *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID, Src0->getType());
+    return CGF.Builder.CreateConstrainedFPCall(F, { Src0 });
+  } else {
+    Value *F = CGF.CGM.getIntrinsic(IntrinsicID, Src0->getType());
+    return CGF.Builder.CreateCall(F, Src0);
+  }
+}
+  
+// Emit an intrinsic that has 2 operands of the same type as its result.
+// Depending on mode, this may be a constrained floating-point intrinsic.
+static Value *emitBinaryMaybeConstrainedFPBuiltin(CodeGenFunction &CGF,
+                                const CallExpr *E, unsigned IntrinsicID,
+                                unsigned ConstrainedIntrinsicID) {
+  llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
+  llvm::Value *Src1 = CGF.EmitScalarExpr(E->getArg(1));
+
+  if (CGF.Builder.getIsFPConstrained()) {
+    Value *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID, Src0->getType());
+    return CGF.Builder.CreateConstrainedFPCall(F, { Src0, Src1 });
+  } else {
+    Value *F = CGF.CGM.getIntrinsic(IntrinsicID, Src0->getType());
+    return CGF.Builder.CreateCall(F, { Src0, Src1 });
+  }
+}
+
+// Emit an intrinsic that has 3 operands of the same type as its result.
+// Depending on mode, this may be a constrained floating-point intrinsic.
+static Value *emitTernaryMaybeConstrainedFPBuiltin(CodeGenFunction &CGF,
+                                 const CallExpr *E, unsigned IntrinsicID,
+                                 unsigned ConstrainedIntrinsicID) {
+  llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
+  llvm::Value *Src1 = CGF.EmitScalarExpr(E->getArg(1));
+  llvm::Value *Src2 = CGF.EmitScalarExpr(E->getArg(2));
+
+  if (CGF.Builder.getIsFPConstrained()) {
+    Value *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID, Src0->getType());
+    return CGF.Builder.CreateConstrainedFPCall(F, { Src0, Src1, Src2 });
+  } else {
+    Value *F = CGF.CGM.getIntrinsic(IntrinsicID, Src0->getType());
+    return CGF.Builder.CreateCall(F, { Src0, Src1, Src2 });
+  }
+}
+
+// Emit a simple mangled intrinsic that has 1 argument and a return type
 // matching the argument type.
 static Value *emitUnaryBuiltin(CodeGenFunction &CGF,
                                const CallExpr *E,
                                unsigned IntrinsicID) {
   llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
 
   Function *F = CGF.CGM.getIntrinsic(IntrinsicID, Src0->getType());
   return CGF.Builder.CreateCall(F, Src0);
static Value *emitFPIntBuiltin(CodeGenFunction &CGF,
   llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
   llvm::Value *Src1 = CGF.EmitScalarExpr(E->getArg(1));
 
   Function *F = CGF.CGM.getIntrinsic(IntrinsicID, Src0->getType());
   return CGF.Builder.CreateCall(F, {Src0, Src1});
 }
 
 // Emit an intrinsic that has overloaded integer result and fp operand.
-static Value *emitFPToIntRoundBuiltin(CodeGenFunction &CGF,
-                                      const CallExpr *E,
-                                      unsigned IntrinsicID) {
-   llvm::Type *ResultType = CGF.ConvertType(E->getType());
-   llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
+static Value *
+emitMaybeConstrainedFPToIntRoundBuiltin(CodeGenFunction &CGF, const CallExpr *E,
+                                        unsigned IntrinsicID,
+                                        unsigned ConstrainedIntrinsicID) {
 
-   Function *F = CGF.CGM.getIntrinsic(IntrinsicID,
+  if (CGF.Builder.getIsFPConstrained()) {
+    Function *F = CGF.CGM.getIntrinsic(ConstrainedIntrinsicID,
                                        {ResultType, Src0->getType()});
+    return CGF.Builder.CreateConstrainedFPCall(F, {Src0});
+  } else {
+    Function *F =
+        CGF.CGM.getIntrinsic(IntrinsicID, {ResultType, Src0->getType()});
     return CGF.Builder.CreateCall(F, Src0);
   }
+}
 
 /// EmitFAbs - Emit a call to @llvm.fabs().
 static Value *EmitFAbs(CodeGenFunction &CGF, Value *V) {
   Function *F = CGF.CGM.getIntrinsic(Intrinsic::fabs, V->getType());
   llvm::CallInst *Call = CGF.Builder.CreateCall(F, V);
   Call->setDoesNotAccessMemory();
   return Call;
 }
if (FD->hasAttr<ConstAttr>()) {
     switch (BuiltinID) {
     case Builtin::BIceil:
     case Builtin::BIceilf:
     case Builtin::BIceill:
     case Builtin::BI__builtin_ceil:
     case Builtin::BI__builtin_ceilf:
     case Builtin::BI__builtin_ceilf16:
     case Builtin::BI__builtin_ceill:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::ceil));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::ceil,
+                                   Intrinsic::experimental_constrained_ceil));
 
     case Builtin::BIcopysign:
     case Builtin::BIcopysignf:
     case Builtin::BIcopysignl:
     case Builtin::BI__builtin_copysign:
     case Builtin::BI__builtin_copysignf:
     case Builtin::BI__builtin_copysignf16:
     case Builtin::BI__builtin_copysignl:
     case Builtin::BI__builtin_copysignf128:
       return RValue::get(emitBinaryBuiltin(*this, E, Intrinsic::copysign));
 
     case Builtin::BIcos:
     case Builtin::BIcosf:
     case Builtin::BIcosl:
     case Builtin::BI__builtin_cos:
     case Builtin::BI__builtin_cosf:
     case Builtin::BI__builtin_cosf16:
     case Builtin::BI__builtin_cosl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::cos));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::cos,
+                                   Intrinsic::experimental_constrained_cos));
 
     case Builtin::BIexp:
     case Builtin::BIexpf:
     case Builtin::BIexpl:
     case Builtin::BI__builtin_exp:
     case Builtin::BI__builtin_expf:
     case Builtin::BI__builtin_expf16:
     case Builtin::BI__builtin_expl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::exp));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::exp,
+                                   Intrinsic::experimental_constrained_exp));
 
     case Builtin::BIexp2:
     case Builtin::BIexp2f:
     case Builtin::BIexp2l:
     case Builtin::BI__builtin_exp2:
     case Builtin::BI__builtin_exp2f:
     case Builtin::BI__builtin_exp2f16:
     case Builtin::BI__builtin_exp2l:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::exp2));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::exp2,
+                                   Intrinsic::experimental_constrained_exp2));
 
     case Builtin::BIfabs:
     case Builtin::BIfabsf:
     case Builtin::BIfabsl:
     case Builtin::BI__builtin_fabs:
     case Builtin::BI__builtin_fabsf:
     case Builtin::BI__builtin_fabsf16:
     case Builtin::BI__builtin_fabsl:
     case Builtin::BI__builtin_fabsf128:
       return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::fabs));
 
     case Builtin::BIfloor:
     case Builtin::BIfloorf:
     case Builtin::BIfloorl:
     case Builtin::BI__builtin_floor:
     case Builtin::BI__builtin_floorf:
     case Builtin::BI__builtin_floorf16:
     case Builtin::BI__builtin_floorl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::floor));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::floor,
+                                   Intrinsic::experimental_constrained_floor));
 
     case Builtin::BIfma:
     case Builtin::BIfmaf:
     case Builtin::BIfmal:
     case Builtin::BI__builtin_fma:
     case Builtin::BI__builtin_fmaf:
     case Builtin::BI__builtin_fmaf16:
     case Builtin::BI__builtin_fmal:
-      return RValue::get(emitTernaryBuiltin(*this, E, Intrinsic::fma));
+      return RValue::get(emitTernaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::fma,
+                                   Intrinsic::experimental_constrained_fma));
 
     case Builtin::BIfmax:
     case Builtin::BIfmaxf:
     case Builtin::BIfmaxl:
     case Builtin::BI__builtin_fmax:
     case Builtin::BI__builtin_fmaxf:
     case Builtin::BI__builtin_fmaxf16:
     case Builtin::BI__builtin_fmaxl:
-      return RValue::get(emitBinaryBuiltin(*this, E, Intrinsic::maxnum));
+      return RValue::get(emitBinaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::maxnum,
+                                   Intrinsic::experimental_constrained_maxnum));
 
     case Builtin::BIfmin:
     case Builtin::BIfminf:
     case Builtin::BIfminl:
     case Builtin::BI__builtin_fmin:
     case Builtin::BI__builtin_fminf:
     case Builtin::BI__builtin_fminf16:
     case Builtin::BI__builtin_fminl:
-      return RValue::get(emitBinaryBuiltin(*this, E, Intrinsic::minnum));
+      return RValue::get(emitBinaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::minnum,
+                                   Intrinsic::experimental_constrained_minnum));
 
     // fmod() is a special-case. It maps to the frem instruction rather than an
     // LLVM intrinsic.
     case Builtin::BIfmod:
     case Builtin::BIfmodf:
     case Builtin::BIfmodl:
     case Builtin::BI__builtin_fmod:
     case Builtin::BI__builtin_fmodf:
     case Builtin::BI__builtin_fmodf16:
     case Builtin::BI__builtin_fmodl: {
       Value *Arg1 = EmitScalarExpr(E->getArg(0));
       Value *Arg2 = EmitScalarExpr(E->getArg(1));
       return RValue::get(Builder.CreateFRem(Arg1, Arg2, "fmod"));
     }
 
     case Builtin::BIlog:
     case Builtin::BIlogf:
     case Builtin::BIlogl:
     case Builtin::BI__builtin_log:
     case Builtin::BI__builtin_logf:
     case Builtin::BI__builtin_logf16:
     case Builtin::BI__builtin_logl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::log));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::log,
+                                   Intrinsic::experimental_constrained_log));
 
     case Builtin::BIlog10:
     case Builtin::BIlog10f:
     case Builtin::BIlog10l:
     case Builtin::BI__builtin_log10:
     case Builtin::BI__builtin_log10f:
     case Builtin::BI__builtin_log10f16:
     case Builtin::BI__builtin_log10l:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::log10));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::log10,
+                                   Intrinsic::experimental_constrained_log10));
 
     case Builtin::BIlog2:
     case Builtin::BIlog2f:
     case Builtin::BIlog2l:
     case Builtin::BI__builtin_log2:
     case Builtin::BI__builtin_log2f:
     case Builtin::BI__builtin_log2f16:
     case Builtin::BI__builtin_log2l:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::log2));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::log2,
+                                   Intrinsic::experimental_constrained_log2));
 
     case Builtin::BInearbyint:
     case Builtin::BInearbyintf:
     case Builtin::BInearbyintl:
     case Builtin::BI__builtin_nearbyint:
     case Builtin::BI__builtin_nearbyintf:
     case Builtin::BI__builtin_nearbyintl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::nearbyint));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                Intrinsic::nearbyint,
+                                Intrinsic::experimental_constrained_nearbyint));
 
     case Builtin::BIpow:
     case Builtin::BIpowf:
     case Builtin::BIpowl:
     case Builtin::BI__builtin_pow:
     case Builtin::BI__builtin_powf:
     case Builtin::BI__builtin_powf16:
     case Builtin::BI__builtin_powl:
-      return RValue::get(emitBinaryBuiltin(*this, E, Intrinsic::pow));
+      return RValue::get(emitBinaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::pow,
+                                   Intrinsic::experimental_constrained_pow));
 
     case Builtin::BIrint:
     case Builtin::BIrintf:
     case Builtin::BIrintl:
     case Builtin::BI__builtin_rint:
     case Builtin::BI__builtin_rintf:
     case Builtin::BI__builtin_rintf16:
     case Builtin::BI__builtin_rintl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::rint));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::rint,
+                                   Intrinsic::experimental_constrained_rint));
 
     case Builtin::BIround:
     case Builtin::BIroundf:
     case Builtin::BIroundl:
     case Builtin::BI__builtin_round:
     case Builtin::BI__builtin_roundf:
     case Builtin::BI__builtin_roundf16:
     case Builtin::BI__builtin_roundl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::round));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::round,
+                                   Intrinsic::experimental_constrained_round));
 
     case Builtin::BIsin:
     case Builtin::BIsinf:
     case Builtin::BIsinl:
     case Builtin::BI__builtin_sin:
     case Builtin::BI__builtin_sinf:
     case Builtin::BI__builtin_sinf16:
     case Builtin::BI__builtin_sinl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::sin));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::sin,
+                                   Intrinsic::experimental_constrained_sin));
 
     case Builtin::BIsqrt:
     case Builtin::BIsqrtf:
     case Builtin::BIsqrtl:
     case Builtin::BI__builtin_sqrt:
     case Builtin::BI__builtin_sqrtf:
     case Builtin::BI__builtin_sqrtf16:
     case Builtin::BI__builtin_sqrtl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::sqrt));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::sqrt,
+                                   Intrinsic::experimental_constrained_sqrt));
 
     case Builtin::BItrunc:
     case Builtin::BItruncf:
     case Builtin::BItruncl:
     case Builtin::BI__builtin_trunc:
     case Builtin::BI__builtin_truncf:
     case Builtin::BI__builtin_truncf16:
     case Builtin::BI__builtin_truncl:
-      return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::trunc));
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E, 
+                                   Intrinsic::trunc,
+                                   Intrinsic::experimental_constrained_trunc));
 
     case Builtin::BIlround:
     case Builtin::BIlroundf:
     case Builtin::BIlroundl:
     case Builtin::BI__builtin_lround:
     case Builtin::BI__builtin_lroundf:
     case Builtin::BI__builtin_lroundl:
-      return RValue::get(emitFPToIntRoundBuiltin(*this, E, Intrinsic::lround));
+      return RValue::get(emitMaybeConstrainedFPToIntRoundBuiltin(
+          *this, E, Intrinsic::lround,
+          Intrinsic::experimental_constrained_lround));
 
     case Builtin::BIllround:
     case Builtin::BIllroundf:
     case Builtin::BIllroundl:
     case Builtin::BI__builtin_llround:
     case Builtin::BI__builtin_llroundf:
     case Builtin::BI__builtin_llroundl:
-      return RValue::get(emitFPToIntRoundBuiltin(*this, E, Intrinsic::llround));
+      return RValue::get(emitMaybeConstrainedFPToIntRoundBuiltin(
+          *this, E, Intrinsic::llround,
+          Intrinsic::experimental_constrained_llround));
 
     case Builtin::BIlrint:
     case Builtin::BIlrintf:
     case Builtin::BIlrintl:
     case Builtin::BI__builtin_lrint:
     case Builtin::BI__builtin_lrintf:
     case Builtin::BI__builtin_lrintl:
-      return RValue::get(emitFPToIntRoundBuiltin(*this, E, Intrinsic::lrint));
+      return RValue::get(emitMaybeConstrainedFPToIntRoundBuiltin(
+          *this, E, Intrinsic::lrint,
+          Intrinsic::experimental_constrained_lrint));
 
     case Builtin::BIllrint:
     case Builtin::BIllrintf:
     case Builtin::BIllrintl:
     case Builtin::BI__builtin_llrint:
     case Builtin::BI__builtin_llrintf:
     case Builtin::BI__builtin_llrintl:
-      return RValue::get(emitFPToIntRoundBuiltin(*this, E, Intrinsic::llrint));
+      return RValue::get(emitMaybeConstrainedFPToIntRoundBuiltin(
+          *this, E, Intrinsic::llrint,
+          Intrinsic::experimental_constrained_llrint));
 
     default:
       break;
     }
   }
 
   switch (BuiltinID) {
   default: break;
case Builtin::BI__builtin_unreachable: {
     // We do need to preserve an insertion point.
     EmitBlock(createBasicBlock("unreachable.cont"));
 
     return RValue::get(nullptr);
   }
 
   case Builtin::BI__builtin_powi:
   case Builtin::BI__builtin_powif:
-  case Builtin::BI__builtin_powil: {
+  case Builtin::BI__builtin_powil:
+    return RValue::get(emitBinaryMaybeConstrainedFPBuiltin(
+        *this, E, Intrinsic::powi, Intrinsic::experimental_constrained_powi));
+#if 0
     Value *Base = EmitScalarExpr(E->getArg(0));
     Value *Exponent = EmitScalarExpr(E->getArg(1));
     llvm::Type *ArgType = Base->getType();
+    // XXX Maybe
+    if (Builder.getIsFPConstrained()) {
+      Function *F = CGM.getIntrinsic(Intrinsic::experimental_constrained_powi, ArgType);
+      return RValue::get(Builder.CreateConstrainedFPCall(F, {Base, Exponent}));
+    }
+    else {
       Function *F = CGM.getIntrinsic(Intrinsic::powi, ArgType);
       return RValue::get(Builder.CreateCall(F, {Base, Exponent}));
     }
+#endif
 
   case Builtin::BI__builtin_isgreater:
   case Builtin::BI__builtin_isgreaterequal:
   case Builtin::BI__builtin_isless:
   case Builtin::BI__builtin_islessequal:
   case Builtin::BI__builtin_islessgreater:
   case Builtin::BI__builtin_isunordered: {
     // Ordered comparisons: we know the arguments to these are matching scalar

clang/test/CodeGen/constrained-math-builtins.c

+// RUN: %clang_cc1 -triple x86_64-linux -ffp-exception-behavior=strict -w -S -o - -emit-llvm %s | FileCheck %s
+
+// Test codegen of constrained math builtins.
+
+void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
+  f = __builtin_fmod(f,f);    f = __builtin_fmodf(f,f);   f =  __builtin_fmodl(f,f);
+
+// CHECK: declare double @llvm.experimental.constrained.frem.f64(double, double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.frem.f32(float, float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.frem.f80(x86_fp80, x86_fp80, metadata, metadata)
+
+  __builtin_pow(f,f);        __builtin_powf(f,f);       __builtin_powl(f,f);
+
+// CHECK: declare double @llvm.experimental.constrained.pow.f64(double, double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.pow.f32(float, float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.pow.f80(x86_fp80, x86_fp80, metadata, metadata)
+
+  __builtin_powi(f,f);        __builtin_powif(f,f);       __builtin_powil(f,f);
+
+// CHECK: declare double @llvm.experimental.constrained.powi.f64(double, i32, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.powi.f32(float, i32, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.powi.f80(x86_fp80, i32, metadata, metadata)
+
+  __builtin_ceil(f);       __builtin_ceilf(f);      __builtin_ceill(f);
+
+// CHECK: declare double @llvm.experimental.constrained.ceil.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.ceil.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.ceil.f80(x86_fp80, metadata, metadata)
+
+  __builtin_cos(f);        __builtin_cosf(f);       __builtin_cosl(f); 
+
+// CHECK: declare double @llvm.experimental.constrained.cos.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.cos.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.cos.f80(x86_fp80, metadata, metadata)
+
+  __builtin_exp(f);        __builtin_expf(f);       __builtin_expl(f);
+
+// CHECK: declare double @llvm.experimental.constrained.exp.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.exp.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.exp.f80(x86_fp80, metadata, metadata)
+
+  __builtin_exp2(f);       __builtin_exp2f(f);      __builtin_exp2l(f); 
+
+// CHECK: declare double @llvm.experimental.constrained.exp2.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.exp2.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.exp2.f80(x86_fp80, metadata, metadata)
+
+  __builtin_floor(f);      __builtin_floorf(f);     __builtin_floorl(f);
+
+// CHECK: declare double @llvm.experimental.constrained.floor.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.floor.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.floor.f80(x86_fp80, metadata, metadata)
+
+  __builtin_fma(f,f,f);        __builtin_fmaf(f,f,f);       __builtin_fmal(f,f,f);
+
+// CHECK: declare double @llvm.experimental.constrained.fma.f64(double, double, double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.fma.f32(float, float, float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.fma.f80(x86_fp80, x86_fp80, x86_fp80, metadata, metadata)
+
+  __builtin_fmax(f,f);       __builtin_fmaxf(f,f);      __builtin_fmaxl(f,f);
+
+// CHECK: declare double @llvm.experimental.constrained.maxnum.f64(double, double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.maxnum.f32(float, float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.maxnum.f80(x86_fp80, x86_fp80, metadata, metadata)
+
+  __builtin_fmin(f,f);       __builtin_fminf(f,f);      __builtin_fminl(f,f);
+
+// CHECK: declare double @llvm.experimental.constrained.minnum.f64(double, double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.minnum.f32(float, float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.minnum.f80(x86_fp80, x86_fp80, metadata, metadata)
+
+  __builtin_llrint(f);     __builtin_llrintf(f);    __builtin_llrintl(f);
+
+// CHECK: declare i64 @llvm.experimental.constrained.llrint.i64.f64(double, metadata, metadata)
+// CHECK: declare i64 @llvm.experimental.constrained.llrint.i64.f32(float, metadata, metadata)
+// CHECK: declare i64 @llvm.experimental.constrained.llrint.i64.f80(x86_fp80, metadata, metadata)
+
+  __builtin_llround(f);    __builtin_llroundf(f);   __builtin_llroundl(f);
+
+// CHECK: declare i64 @llvm.experimental.constrained.llround.i64.f64(double, metadata)
+// CHECK: declare i64 @llvm.experimental.constrained.llround.i64.f32(float, metadata)
+// CHECK: declare i64 @llvm.experimental.constrained.llround.i64.f80(x86_fp80, metadata)
+
+  __builtin_log(f);        __builtin_logf(f);       __builtin_logl(f);
+
+// CHECK: declare double @llvm.experimental.constrained.log.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.log.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.log.f80(x86_fp80, metadata, metadata)
+
+  __builtin_log10(f);      __builtin_log10f(f);     __builtin_log10l(f);
+
+// CHECK: declare double @llvm.experimental.constrained.log10.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.log10.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.log10.f80(x86_fp80, metadata, metadata)
+
+  __builtin_log2(f);       __builtin_log2f(f);      __builtin_log2l(f);
+
+// CHECK: declare double @llvm.experimental.constrained.log2.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.log2.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.log2.f80(x86_fp80, metadata, metadata)
+
+  __builtin_lrint(f);      __builtin_lrintf(f);     __builtin_lrintl(f);
+
+// CHECK: declare i64 @llvm.experimental.constrained.lrint.i64.f64(double, metadata, metadata)
+// CHECK: declare i64 @llvm.experimental.constrained.lrint.i64.f32(float, metadata, metadata)
+// CHECK: declare i64 @llvm.experimental.constrained.lrint.i64.f80(x86_fp80, metadata, metadata)
+
+  __builtin_lround(f);     __builtin_lroundf(f);    __builtin_lroundl(f);
+
+// CHECK: declare i64 @llvm.experimental.constrained.lround.i64.f64(double, metadata)
+// CHECK: declare i64 @llvm.experimental.constrained.lround.i64.f32(float, metadata)
+// CHECK: declare i64 @llvm.experimental.constrained.lround.i64.f80(x86_fp80, metadata)
+
+  __builtin_nearbyint(f);  __builtin_nearbyintf(f); __builtin_nearbyintl(f);
+
+// CHECK: declare double @llvm.experimental.constrained.nearbyint.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.nearbyint.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.nearbyint.f80(x86_fp80, metadata, metadata)
+
+  __builtin_rint(f);       __builtin_rintf(f);      __builtin_rintl(f);
+
+// CHECK: declare double @llvm.experimental.constrained.rint.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.rint.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.rint.f80(x86_fp80, metadata, metadata)
+
+  __builtin_round(f);      __builtin_roundf(f);     __builtin_roundl(f);
+
+// CHECK: declare double @llvm.experimental.constrained.round.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.round.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.round.f80(x86_fp80, metadata, metadata)
+
+  __builtin_sin(f);        __builtin_sinf(f);       __builtin_sinl(f);
+
+// CHECK: declare double @llvm.experimental.constrained.sin.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.sin.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.sin.f80(x86_fp80, metadata, metadata)
+
+  __builtin_sqrt(f);       __builtin_sqrtf(f);      __builtin_sqrtl(f); 
+
+// CHECK: declare double @llvm.experimental.constrained.sqrt.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.sqrt.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.sqrt.f80(x86_fp80, metadata, metadata)
+
+  __builtin_trunc(f);      __builtin_truncf(f);     __builtin_truncl(f);
+
+// CHECK: declare double @llvm.experimental.constrained.trunc.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.trunc.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.trunc.f80(x86_fp80, metadata, metadata)
+};
+

llvm/include/llvm/IR/IRBuilder.h

CallInst *CreateConstrainedFPCast(
     default: {
       Value *RoundingV = getConstrainedFPRounding(Rounding);
       C = CreateIntrinsic(ID, {DestTy, V->getType()}, {V, RoundingV, ExceptV},
                           nullptr, Name);
     } break;
     case Intrinsic::experimental_constrained_fpext:
     case Intrinsic::experimental_constrained_fptoui:
     case Intrinsic::experimental_constrained_fptosi:
+    case Intrinsic::experimental_constrained_lround:
+    case Intrinsic::experimental_constrained_llround:
       C = CreateIntrinsic(ID, {DestTy, V->getType()}, {V, ExceptV}, nullptr,
                           Name);
       break;
     }
     setConstrainedFPCallAttr(C);
 
     if (isa<FPMathOperator>(C))
       setFPAttrs(C, FPMathTag, UseFMF);

   CallInst *CreateCall(Value *Callee, ArrayRef<Value *> Args,
                        ArrayRef<OperandBundleDef> OpBundles,
                        const Twine &Name = "", MDNode *FPMathTag = nullptr) {
     return CreateCall(
         cast<FunctionType>(Callee->getType()->getPointerElementType()), Callee,
         Args, OpBundles, Name, FPMathTag);
   }
 
+  // Deprecated [opaque pointer types]
+  CallInst *CreateConstrainedFPCall(
+      Value *Callee, ArrayRef<Value *> Args, const Twine &Name = "",
+      Optional<fp::RoundingMode> Rounding = None,
+      Optional<fp::ExceptionBehavior> Except = None) {
+    llvm::SmallVector<Value *, 6> UseArgs;
+
+    for (auto *OneArg : Args)
+      UseArgs.push_back(OneArg);
+    Function *F = cast<Function>(Callee);
+    switch (F->getIntrinsicID()) {
+    default:
+      UseArgs.push_back(getConstrainedFPRounding(Rounding));
+      break;
+    case Intrinsic::experimental_constrained_fpext:
+    case Intrinsic::experimental_constrained_fptoui:
+    case Intrinsic::experimental_constrained_fptosi:
+    case Intrinsic::experimental_constrained_lround:
+    case Intrinsic::experimental_constrained_llround:
+      // No rounding metadata for these intrinsics.
+      break;
+    }
+    UseArgs.push_back(getConstrainedFPExcept(Except));
+
+    CallInst *C = CreateCall(
+        cast<FunctionType>(Callee->getType()->getPointerElementType()), Callee,
+        UseArgs, Name);
+    setConstrainedFPCallAttr(C);
+    return C;
+  }
+
   Value *CreateSelect(Value *C, Value *True, Value *False,
                       const Twine &Name = "", Instruction *MDFrom = nullptr) {
     if (auto *CC = dyn_cast<Constant>(C))
       if (auto *TC = dyn_cast<Constant>(True))
         if (auto *FC = dyn_cast<Constant>(False))
           return Insert(Folder.CreateSelect(CC, TC, FC), Name);
 
     SelectInst *Sel = SelectInst::Create(C, True, False);