[clang] [llvm] [clang] Reland Add tanf16 builtin and support for tan constrained intrinsic (PR #94559)

Farzon Lotfi via cfe-commits cfe-commits at lists.llvm.org
Fri Jun 7 16:11:41 PDT 2024


https://github.com/farzonl updated https://github.com/llvm/llvm-project/pull/94559

>From 51247e430ad49c4729e2e3664104367b13fbad9e Mon Sep 17 00:00:00 2001
From: Farzon Lotfi <farzonlotfi at microsoft.com>
Date: Fri, 24 May 2024 10:01:52 -0400
Subject: [PATCH 1/2] [clang] Add tanf16 builtin and support for tan
 constrained intrinsic

---
 clang/include/clang/Basic/Builtins.td         |  6 ++--
 clang/lib/CodeGen/CGBuiltin.cpp               | 12 +++++++
 clang/test/CodeGen/X86/math-builtins.c        |  8 ++---
 .../test/CodeGen/constrained-math-builtins.c  | 13 +++++++
 clang/test/CodeGen/math-libcalls.c            | 12 +++----
 clang/test/CodeGenOpenCL/builtins-f16.cl      |  3 ++
 llvm/docs/LangRef.rst                         | 36 +++++++++++++++++++
 llvm/include/llvm/IR/ConstrainedOps.def       |  1 +
 llvm/include/llvm/IR/Intrinsics.td            |  4 +++
 llvm/test/Assembler/fp-intrinsics-attr.ll     |  8 +++++
 llvm/test/Feature/fp-intrinsics.ll            | 11 ++++++
 11 files changed, 101 insertions(+), 13 deletions(-)

diff --git a/clang/include/clang/Basic/Builtins.td b/clang/include/clang/Basic/Builtins.td
index 11982af3fa609..7bef5fd7ad40f 100644
--- a/clang/include/clang/Basic/Builtins.td
+++ b/clang/include/clang/Basic/Builtins.td
@@ -482,11 +482,11 @@ def SqrtF16F128 : Builtin, F16F128MathTemplate {
   let Prototype = "T(T)";
 }
 
-def TanF128 : Builtin {
-  let Spellings = ["__builtin_tanf128"];
+def TanF16F128 : Builtin, F16F128MathTemplate {
+  let Spellings = ["__builtin_tan"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow,
                     ConstIgnoringErrnoAndExceptions];
-  let Prototype = "__float128(__float128)";
+  let Prototype = "T(T)";
 }
 
 def TanhF128 : Builtin {
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index c16b69ba87567..06e201fa71e6f 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -2923,6 +2923,18 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
       SetSqrtFPAccuracy(Call);
       return RValue::get(Call);
     }
+
+    case Builtin::BItan:
+    case Builtin::BItanf:
+    case Builtin::BItanl:
+    case Builtin::BI__builtin_tan:
+    case Builtin::BI__builtin_tanf:
+    case Builtin::BI__builtin_tanf16:
+    case Builtin::BI__builtin_tanl:
+    case Builtin::BI__builtin_tanf128:
+      return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(
+          *this, E, Intrinsic::tan, Intrinsic::experimental_constrained_tan));
+
     case Builtin::BItrunc:
     case Builtin::BItruncf:
     case Builtin::BItruncl:
diff --git a/clang/test/CodeGen/X86/math-builtins.c b/clang/test/CodeGen/X86/math-builtins.c
index 093239b448260..1e0f129b98610 100644
--- a/clang/test/CodeGen/X86/math-builtins.c
+++ b/clang/test/CodeGen/X86/math-builtins.c
@@ -674,10 +674,10 @@ __builtin_sqrt(f);       __builtin_sqrtf(f);      __builtin_sqrtl(f); __builtin_
 
 __builtin_tan(f);        __builtin_tanf(f);       __builtin_tanl(f); __builtin_tanf128(f);
 
-// NO__ERRNO: declare double @tan(double noundef) [[READNONE]]
-// NO__ERRNO: declare float @tanf(float noundef) [[READNONE]]
-// NO__ERRNO: declare x86_fp80 @tanl(x86_fp80 noundef) [[READNONE]]
-// NO__ERRNO: declare fp128 @tanf128(fp128 noundef) [[READNONE]]
+// NO__ERRNO: declare double @llvm.tan.f64(double) [[READNONE_INTRINSIC]]
+// NO__ERRNO: declare float @llvm.tan.f32(float) [[READNONE_INTRINSIC]]
+// NO__ERRNO: declare x86_fp80 @llvm.tan.f80(x86_fp80) [[READNONE_INTRINSIC]]
+// NO__ERRNO: declare fp128 @llvm.tan.f128(fp128) [[READNONE_INTRINSIC]]
 // HAS_ERRNO: declare double @tan(double noundef) [[NOT_READNONE]]
 // HAS_ERRNO: declare float @tanf(float noundef) [[NOT_READNONE]]
 // HAS_ERRNO: declare x86_fp80 @tanl(x86_fp80 noundef) [[NOT_READNONE]]
diff --git a/clang/test/CodeGen/constrained-math-builtins.c b/clang/test/CodeGen/constrained-math-builtins.c
index 2de832dd2b6ca..6cc3a10a1e794 100644
--- a/clang/test/CodeGen/constrained-math-builtins.c
+++ b/clang/test/CodeGen/constrained-math-builtins.c
@@ -183,6 +183,14 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c, _
 // CHECK: call x86_fp80 @llvm.experimental.constrained.sqrt.f80(x86_fp80 %{{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
 // CHECK: call fp128 @llvm.experimental.constrained.sqrt.f128(fp128 %{{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
 
+  __builtin_tan(f);        __builtin_tanf(f);       __builtin_tanl(f); __builtin_tanf128(f);
+
+// CHECK: call double @llvm.experimental.constrained.tan.f64(double %{{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
+// CHECK: call float @llvm.experimental.constrained.tan.f32(float %{{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
+// CHECK: call x86_fp80 @llvm.experimental.constrained.tan.f80(x86_fp80 %{{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
+// CHECK: call fp128 @llvm.experimental.constrained.tan.f128(fp128 %{{.*}}, metadata !"round.tonearest", metadata !"fpexcept.strict")
+
+
   __builtin_trunc(f);      __builtin_truncf(f);     __builtin_truncl(f); __builtin_truncf128(f);
 
 // CHECK: call double @llvm.experimental.constrained.trunc.f64(double %{{.*}}, metadata !"fpexcept.strict")
@@ -315,6 +323,11 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c, _
 // CHECK: declare x86_fp80 @llvm.experimental.constrained.sqrt.f80(x86_fp80, metadata, metadata)
 // CHECK: declare fp128 @llvm.experimental.constrained.sqrt.f128(fp128, metadata, metadata)
 
+// CHECK: declare double @llvm.experimental.constrained.tan.f64(double, metadata, metadata)
+// CHECK: declare float @llvm.experimental.constrained.tan.f32(float, metadata, metadata)
+// CHECK: declare x86_fp80 @llvm.experimental.constrained.tan.f80(x86_fp80, metadata, metadata)
+// CHECK: declare fp128 @llvm.experimental.constrained.tan.f128(fp128, metadata, metadata)
+
 // CHECK: declare double @llvm.experimental.constrained.trunc.f64(double, metadata)
 // CHECK: declare float @llvm.experimental.constrained.trunc.f32(float, metadata)
 // CHECK: declare x86_fp80 @llvm.experimental.constrained.trunc.f80(x86_fp80, metadata)
diff --git a/clang/test/CodeGen/math-libcalls.c b/clang/test/CodeGen/math-libcalls.c
index 29c312ba0ecac..a249182692762 100644
--- a/clang/test/CodeGen/math-libcalls.c
+++ b/clang/test/CodeGen/math-libcalls.c
@@ -662,15 +662,15 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
 
   tan(f);        tanf(f);       tanl(f);
 
-// NO__ERRNO: declare double @tan(double noundef) [[READNONE]]
-// NO__ERRNO: declare float @tanf(float noundef) [[READNONE]]
-// NO__ERRNO: declare x86_fp80 @tanl(x86_fp80 noundef) [[READNONE]]
+// NO__ERRNO: declare double @llvm.tan.f64(double) [[READNONE_INTRINSIC]]
+// NO__ERRNO: declare float @llvm.tan.f32(float) [[READNONE_INTRINSIC]]
+// NO__ERRNO: declare x86_fp80 @llvm.tan.f80(x86_fp80) [[READNONE_INTRINSIC]]
 // HAS_ERRNO: declare double @tan(double noundef) [[NOT_READNONE]]
 // HAS_ERRNO: declare float @tanf(float noundef) [[NOT_READNONE]]
 // HAS_ERRNO: declare x86_fp80 @tanl(x86_fp80 noundef) [[NOT_READNONE]]
-// HAS_MAYTRAP: declare double @tan(double noundef) [[NOT_READNONE]]
-// HAS_MAYTRAP: declare float @tanf(float noundef) [[NOT_READNONE]]
-// HAS_MAYTRAP: declare x86_fp80 @tanl(x86_fp80 noundef) [[NOT_READNONE]]
+// HAS_MAYTRAP: declare double @llvm.experimental.constrained.tan.f64(
+// HAS_MAYTRAP: declare float @llvm.experimental.constrained.tan.f32(
+// HAS_MAYTRAP: declare x86_fp80 @llvm.experimental.constrained.tan.f80(
 
   tanh(f);       tanhf(f);      tanhl(f);
 
diff --git a/clang/test/CodeGenOpenCL/builtins-f16.cl b/clang/test/CodeGenOpenCL/builtins-f16.cl
index adf7cdde154f5..d7bffdad5c548 100644
--- a/clang/test/CodeGenOpenCL/builtins-f16.cl
+++ b/clang/test/CodeGenOpenCL/builtins-f16.cl
@@ -66,6 +66,9 @@ void test_half_builtins(half h0, half h1, half h2, int i0) {
   // CHECK: call half @llvm.sqrt.f16(half %h0)
   res = __builtin_sqrtf16(h0);
 
+  // CHECK: call half @llvm.tan.f16(half %h0)
+  res = __builtin_tanf16(h0);
+
   // CHECK: call half @llvm.trunc.f16(half %h0)
   res = __builtin_truncf16(h0);
 
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 9fb2c048a5c86..c11a6627d81d3 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -26244,6 +26244,42 @@ same values as the libm ``cos`` functions would, and handles error
 conditions in the same way.
 
 
+'``llvm.experimental.constrained.tan``' Intrinsic
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+      declare <type>
+      @llvm.experimental.constrained.tan(<type> <op1>,
+                                         metadata <rounding mode>,
+                                         metadata <exception behavior>)
+
+Overview:
+"""""""""
+
+The '``llvm.experimental.constrained.tan``' intrinsic returns the tangent of the
+first operand.
+
+Arguments:
+""""""""""
+
+The first argument and the return type are floating-point numbers of the same
+type.
+
+The second and third arguments specify the rounding mode and exception
+behavior as described above.
+
+Semantics:
+""""""""""
+
+This function returns the tangent of the specified operand, returning the
+same values as the libm ``tan`` functions would, and handles error
+conditions in the same way.
+
+
 '``llvm.experimental.constrained.exp``' Intrinsic
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/llvm/include/llvm/IR/ConstrainedOps.def b/llvm/include/llvm/IR/ConstrainedOps.def
index 41aa44de957f9..a7b37c5cb204d 100644
--- a/llvm/include/llvm/IR/ConstrainedOps.def
+++ b/llvm/include/llvm/IR/ConstrainedOps.def
@@ -95,6 +95,7 @@ DAG_FUNCTION(round,           1, 0, experimental_constrained_round,      FROUND)
 DAG_FUNCTION(roundeven,       1, 0, experimental_constrained_roundeven,  FROUNDEVEN)
 DAG_FUNCTION(sin,             1, 1, experimental_constrained_sin,        FSIN)
 DAG_FUNCTION(sqrt,            1, 1, experimental_constrained_sqrt,       FSQRT)
+DAG_FUNCTION(tan,             1, 1, experimental_constrained_tan,        FTAN)
 DAG_FUNCTION(trunc,           1, 0, experimental_constrained_trunc,      FTRUNC)
 
 // This is definition for fmuladd intrinsic function, that is converted into
diff --git a/llvm/include/llvm/IR/Intrinsics.td b/llvm/include/llvm/IR/Intrinsics.td
index 107442623ab7b..4c506a6ace23e 100644
--- a/llvm/include/llvm/IR/Intrinsics.td
+++ b/llvm/include/llvm/IR/Intrinsics.td
@@ -1218,6 +1218,10 @@ let IntrProperties = [IntrInaccessibleMemOnly, IntrWillReturn, IntrStrictFP] in
                                                     [ LLVMMatchType<0>,
                                                       llvm_metadata_ty,
                                                       llvm_metadata_ty ]>;
+  def int_experimental_constrained_tan  : DefaultAttrsIntrinsic<[ llvm_anyfloat_ty ],
+                                                    [ LLVMMatchType<0>,
+                                                      llvm_metadata_ty,
+                                                      llvm_metadata_ty ]>;
   def int_experimental_constrained_pow  : DefaultAttrsIntrinsic<[ llvm_anyfloat_ty ],
                                                     [ LLVMMatchType<0>,
                                                       LLVMMatchType<0>,
diff --git a/llvm/test/Assembler/fp-intrinsics-attr.ll b/llvm/test/Assembler/fp-intrinsics-attr.ll
index 6546d1a275c99..613630e1a2b4d 100644
--- a/llvm/test/Assembler/fp-intrinsics-attr.ll
+++ b/llvm/test/Assembler/fp-intrinsics-attr.ll
@@ -85,6 +85,11 @@ define void @func(double %a, double %b, double %c, i32 %i) strictfp {
                                                metadata !"round.dynamic",
                                                metadata !"fpexcept.strict")
 
+  %tan = call double @llvm.experimental.constrained.tan.f64(
+                                               double %a,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict")
+
   %pow = call double @llvm.experimental.constrained.pow.f64(
                                                double %a, double %b,
                                                metadata !"round.dynamic",
@@ -244,6 +249,9 @@ declare double @llvm.experimental.constrained.sin.f64(double, metadata, metadata
 declare double @llvm.experimental.constrained.cos.f64(double, metadata, metadata)
 ; CHECK: @llvm.experimental.constrained.cos.f64({{.*}}) #[[ATTR1]]
 
+declare double @llvm.experimental.constrained.tan.f64(double, metadata, metadata)
+; CHECK: @llvm.experimental.constrained.tan.f64({{.*}}) #[[ATTR1]]
+
 declare double @llvm.experimental.constrained.pow.f64(double, double, metadata, metadata)
 ; CHECK: @llvm.experimental.constrained.pow.f64({{.*}}) #[[ATTR1]]
 
diff --git a/llvm/test/Feature/fp-intrinsics.ll b/llvm/test/Feature/fp-intrinsics.ll
index b92408a1bf1cd..7759813dc2e11 100644
--- a/llvm/test/Feature/fp-intrinsics.ll
+++ b/llvm/test/Feature/fp-intrinsics.ll
@@ -151,6 +151,17 @@ entry:
   ret double %result
 }
 
+; Verify that tan(42.0) isn't simplified when the rounding mode is unknown.
+; CHECK-LABEL: ftan
+; CHECK: call double @llvm.experimental.constrained.tan
+define double @ftan() #0 {
+entry:
+  %result = call double @llvm.experimental.constrained.tan.f64(double 42.0,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict") #0
+  ret double %result
+}
+
 ; Verify that exp(42.0) isn't simplified when the rounding mode is unknown.
 ; CHECK-LABEL: f10
 ; CHECK: call double @llvm.experimental.constrained.exp

>From af44e7880a8f9e49ec39880620e786487632c7b6 Mon Sep 17 00:00:00 2001
From: Farzon Lotfi <farzon at farzon.com>
Date: Fri, 7 Jun 2024 19:11:03 -0400
Subject: [PATCH 2/2] 1. fix typos 2. add arm64 and x86 tests. 3. fix missing
 ISD::STRICT_FTAN in aarch64

---
 .../Target/AArch64/AArch64ISelLowering.cpp    |  16 +-
 .../CodeGen/AArch64/fp-intrinsics-fp16.ll     |  16 ++
 llvm/test/CodeGen/AArch64/fp-intrinsics.ll    |  31 +++
 llvm/test/CodeGen/ARM/fp-intrinsics.ll        |  16 ++
 llvm/test/CodeGen/X86/fp-intrinsics.ll        |  53 ++++
 .../CodeGen/X86/fp-strict-libcalls-msvc32.ll  |  18 ++
 .../test/CodeGen/X86/fp128-libcalls-strict.ll |  41 +++
 llvm/test/CodeGen/X86/fp80-strict-libcalls.ll |  26 ++
 .../X86/vector-constrained-fp-intrinsics.ll   | 233 ++++++++++++++++++
 llvm/test/Feature/fp-intrinsics.ll            |   1 +
 10 files changed, 443 insertions(+), 8 deletions(-)

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 48bf648b00522..958e074b372e0 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -728,14 +728,14 @@ AArch64TargetLowering::AArch64TargetLowering(const TargetMachine &TM,
     setOperationAction(ISD::FCOPYSIGN, MVT::bf16, Promote);
   }
 
-  for (auto Op : {ISD::FREM,         ISD::FPOW,         ISD::FPOWI,
-                  ISD::FCOS,         ISD::FSIN,         ISD::FSINCOS,
-                  ISD::FTAN,         ISD::FEXP,         ISD::FEXP2,
-                  ISD::FEXP10,       ISD::FLOG,         ISD::FLOG2,
-                  ISD::FLOG10,       ISD::STRICT_FREM,  ISD::STRICT_FPOW,
-                  ISD::STRICT_FPOWI, ISD::STRICT_FCOS,  ISD::STRICT_FSIN,
-                  ISD::STRICT_FEXP,  ISD::STRICT_FEXP2, ISD::STRICT_FLOG,
-                  ISD::STRICT_FLOG2, ISD::STRICT_FLOG10}) {
+  for (auto Op : {ISD::FREM,         ISD::FPOW,          ISD::FPOWI,
+                  ISD::FCOS,         ISD::FSIN,          ISD::FSINCOS,
+                  ISD::FTAN,         ISD::FEXP,          ISD::FEXP2,
+                  ISD::FEXP10,       ISD::FLOG,          ISD::FLOG2,
+                  ISD::FLOG10,       ISD::STRICT_FREM,   ISD::STRICT_FPOW,
+                  ISD::STRICT_FPOWI, ISD::STRICT_FCOS,   ISD::STRICT_FSIN,
+                  ISD::STRICT_FEXP,  ISD::STRICT_FEXP2,  ISD::STRICT_FLOG,
+                  ISD::STRICT_FLOG2, ISD::STRICT_FLOG10, ISD::STRICT_FTAN}) {
     setOperationAction(Op, MVT::f16, Promote);
     setOperationAction(Op, MVT::v4f16, Expand);
     setOperationAction(Op, MVT::v8f16, Expand);
diff --git a/llvm/test/CodeGen/AArch64/fp-intrinsics-fp16.ll b/llvm/test/CodeGen/AArch64/fp-intrinsics-fp16.ll
index 48062c9a54b5d..b09ed8d3eb764 100644
--- a/llvm/test/CodeGen/AArch64/fp-intrinsics-fp16.ll
+++ b/llvm/test/CodeGen/AArch64/fp-intrinsics-fp16.ll
@@ -338,6 +338,21 @@ define half @cos_f16(half %x) #0 {
   ret half %val
 }
 
+define half @tan_f16(half %x) #0 {
+; CHECK-LABEL: tan_f16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x30, [sp, #-16]! // 8-byte Folded Spill
+; CHECK-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-NEXT:    .cfi_offset w30, -16
+; CHECK-NEXT:    fcvt s0, h0
+; CHECK-NEXT:    bl tanf
+; CHECK-NEXT:    fcvt h0, s0
+; CHECK-NEXT:    ldr x30, [sp], #16 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %val = call half @llvm.experimental.constrained.tan.f16(half %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+  ret half %val
+}
+
 define half @pow_f16(half %x, half %y) #0 {
 ; CHECK-LABEL: pow_f16:
 ; CHECK:       // %bb.0:
@@ -1147,6 +1162,7 @@ declare half @llvm.experimental.constrained.sqrt.f16(half, metadata, metadata)
 declare half @llvm.experimental.constrained.powi.f16(half, i32, metadata, metadata)
 declare half @llvm.experimental.constrained.sin.f16(half, metadata, metadata)
 declare half @llvm.experimental.constrained.cos.f16(half, metadata, metadata)
+declare half @llvm.experimental.constrained.tan.f16(half, metadata, metadata)
 declare half @llvm.experimental.constrained.pow.f16(half, half, metadata, metadata)
 declare half @llvm.experimental.constrained.log.f16(half, metadata, metadata)
 declare half @llvm.experimental.constrained.log10.f16(half, metadata, metadata)
diff --git a/llvm/test/CodeGen/AArch64/fp-intrinsics.ll b/llvm/test/CodeGen/AArch64/fp-intrinsics.ll
index 685efbb7cad43..67d0b63f4076f 100644
--- a/llvm/test/CodeGen/AArch64/fp-intrinsics.ll
+++ b/llvm/test/CodeGen/AArch64/fp-intrinsics.ll
@@ -146,6 +146,13 @@ define float @cos_f32(float %x) #0 {
   ret float %val
 }
 
+; CHECK-LABEL: tan_f32:
+; CHECK: bl tanf
+define float @tan_f32(float %x) #0 {
+  %val = call float @llvm.experimental.constrained.tan.f32(float %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+  ret float %val
+}
+
 ; CHECK-LABEL: pow_f32:
 ; CHECK: bl powf
 define float @pow_f32(float %x, float %y) #0 {
@@ -630,6 +637,13 @@ define double @cos_f64(double %x) #0 {
   ret double %val
 }
 
+; CHECK-LABEL: tan_f64:
+; CHECK: bl tan
+define double @tan_f64(double %x) #0 {
+  %val = call double @llvm.experimental.constrained.tan.f64(double %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+  ret double %val
+}
+
 ; CHECK-LABEL: pow_f64:
 ; CHECK: bl pow
 define double @pow_f64(double %x, double %y) #0 {
@@ -1114,6 +1128,13 @@ define fp128 @cos_f128(fp128 %x) #0 {
   ret fp128 %val
 }
 
+; CHECK-LABEL: tan_f128:
+; CHECK: bl tanl
+define fp128 @tan_f128(fp128 %x) #0 {
+  %val = call fp128 @llvm.experimental.constrained.tan.f128(fp128 %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+  ret fp128 %val
+}
+
 ; CHECK-LABEL: pow_f128:
 ; CHECK: bl powl
 define fp128 @pow_f128(fp128 %x, fp128 %y) #0 {
@@ -1491,6 +1512,13 @@ define <1 x double> @cos_v1f64(<1 x double> %x, <1 x double> %y) #0 {
   ret <1 x double> %val
 }
 
+; CHECK-LABEL: tan_v1f64:
+; CHECK: bl tan
+define <1 x double> @tan_v1f64(<1 x double> %x, <1 x double> %y) #0 {
+  %val = call <1 x double> @llvm.experimental.constrained.tan.v1f64(<1 x double> %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+  ret <1 x double> %val
+}
+
 ; CHECK-LABEL: pow_v1f64:
 ; CHECK: bl pow
 define <1 x double> @pow_v1f64(<1 x double> %x, <1 x double> %y) #0 {
@@ -1555,6 +1583,7 @@ declare float @llvm.experimental.constrained.sqrt.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.powi.f32(float, i32, metadata, metadata)
 declare float @llvm.experimental.constrained.sin.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.cos.f32(float, metadata, metadata)
+declare float @llvm.experimental.constrained.tan.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.pow.f32(float, float, metadata, metadata)
 declare float @llvm.experimental.constrained.log.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.log10.f32(float, metadata, metadata)
@@ -1599,6 +1628,7 @@ declare double @llvm.experimental.constrained.sqrt.f64(double, metadata, metadat
 declare double @llvm.experimental.constrained.powi.f64(double, i32, metadata, metadata)
 declare double @llvm.experimental.constrained.sin.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.cos.f64(double, metadata, metadata)
+declare double @llvm.experimental.constrained.tan.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.pow.f64(double, double, metadata, metadata)
 declare double @llvm.experimental.constrained.log.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.log10.f64(double, metadata, metadata)
@@ -1643,6 +1673,7 @@ declare fp128 @llvm.experimental.constrained.sqrt.f128(fp128, metadata, metadata
 declare fp128 @llvm.experimental.constrained.powi.f128(fp128, i32, metadata, metadata)
 declare fp128 @llvm.experimental.constrained.sin.f128(fp128, metadata, metadata)
 declare fp128 @llvm.experimental.constrained.cos.f128(fp128, metadata, metadata)
+declare fp128 @llvm.experimental.constrained.tan.f128(fp128, metadata, metadata)
 declare fp128 @llvm.experimental.constrained.pow.f128(fp128, fp128, metadata, metadata)
 declare fp128 @llvm.experimental.constrained.log.f128(fp128, metadata, metadata)
 declare fp128 @llvm.experimental.constrained.log10.f128(fp128, metadata, metadata)
diff --git a/llvm/test/CodeGen/ARM/fp-intrinsics.ll b/llvm/test/CodeGen/ARM/fp-intrinsics.ll
index 64b22a5cc71bc..e286eb3226e46 100644
--- a/llvm/test/CodeGen/ARM/fp-intrinsics.ll
+++ b/llvm/test/CodeGen/ARM/fp-intrinsics.ll
@@ -139,6 +139,13 @@ define float @cos_f32(float %x) #0 {
   ret float %val
 }
 
+; CHECK-LABEL: tan_f32:
+; CHECK: bl tanf
+define float @tan_f32(float %x) #0 {
+  %val = call float @llvm.experimental.constrained.tan.f32(float %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+  ret float %val
+}
+
 ; CHECK-LABEL: pow_f32:
 ; CHECK: bl powf
 define float @pow_f32(float %x, float %y) #0 {
@@ -596,6 +603,13 @@ define double @cos_f64(double %x) #0 {
   ret double %val
 }
 
+; CHECK-LABEL: tan_f64:
+; CHECK: bl tan
+define double @tan_f64(double %x) #0 {
+  %val = call double @llvm.experimental.constrained.tan.f64(double %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+  ret double %val
+}
+
 ; CHECK-LABEL: pow_f64:
 ; CHECK: bl pow
 define double @pow_f64(double %x, double %y) #0 {
@@ -1023,6 +1037,7 @@ declare float @llvm.experimental.constrained.sqrt.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.powi.f32(float, i32, metadata, metadata)
 declare float @llvm.experimental.constrained.sin.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.cos.f32(float, metadata, metadata)
+declare float @llvm.experimental.constrained.tan.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.pow.f32(float, float, metadata, metadata)
 declare float @llvm.experimental.constrained.log.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.log10.f32(float, metadata, metadata)
@@ -1056,6 +1071,7 @@ declare double @llvm.experimental.constrained.sqrt.f64(double, metadata, metadat
 declare double @llvm.experimental.constrained.powi.f64(double, i32, metadata, metadata)
 declare double @llvm.experimental.constrained.sin.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.cos.f64(double, metadata, metadata)
+declare double @llvm.experimental.constrained.tan.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.pow.f64(double, double, metadata, metadata)
 declare double @llvm.experimental.constrained.log.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.log10.f64(double, metadata, metadata)
diff --git a/llvm/test/CodeGen/X86/fp-intrinsics.ll b/llvm/test/CodeGen/X86/fp-intrinsics.ll
index d2b45ee1e03e6..8c48e6f9da80a 100644
--- a/llvm/test/CodeGen/X86/fp-intrinsics.ll
+++ b/llvm/test/CodeGen/X86/fp-intrinsics.ll
@@ -2758,6 +2758,58 @@ entry:
   ret float %result
 }
 
+; Verify that tan(42.0) isn't simplified when the rounding mode is unknown.
+define double @ftan() #0 {
+; X87-LABEL: ftan:
+; X87:       # %bb.0: # %entry
+; X87-NEXT:    subl $12, %esp
+; X87-NEXT:    .cfi_def_cfa_offset 16
+; X87-NEXT:    flds {{\.?LCPI[0-9]+_[0-9]+}}
+; X87-NEXT:    fstpl (%esp)
+; X87-NEXT:    wait
+; X87-NEXT:    calll tan
+; X87-NEXT:    addl $12, %esp
+; X87-NEXT:    .cfi_def_cfa_offset 4
+; X87-NEXT:    retl
+;
+; X86-SSE-LABEL: ftan:
+; X86-SSE:       # %bb.0: # %entry
+; X86-SSE-NEXT:    subl $12, %esp
+; X86-SSE-NEXT:    .cfi_def_cfa_offset 16
+; X86-SSE-NEXT:    movsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; X86-SSE-NEXT:    movsd %xmm0, (%esp)
+; X86-SSE-NEXT:    calll tan
+; X86-SSE-NEXT:    addl $12, %esp
+; X86-SSE-NEXT:    .cfi_def_cfa_offset 4
+; X86-SSE-NEXT:    retl
+;
+; SSE-LABEL: ftan:
+; SSE:       # %bb.0: # %entry
+; SSE-NEXT:    pushq %rax
+; SSE-NEXT:    .cfi_def_cfa_offset 16
+; SSE-NEXT:    movsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; SSE-NEXT:    callq tan at PLT
+; SSE-NEXT:    popq %rax
+; SSE-NEXT:    .cfi_def_cfa_offset 8
+; SSE-NEXT:    retq
+;
+; AVX-LABEL: ftan:
+; AVX:       # %bb.0: # %entry
+; AVX-NEXT:    pushq %rax
+; AVX-NEXT:    .cfi_def_cfa_offset 16
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    popq %rax
+; AVX-NEXT:    .cfi_def_cfa_offset 8
+; AVX-NEXT:    retq
+entry:
+  %result = call double @llvm.experimental.constrained.tan.f64(double 42.0,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict") #0
+  ret double %result
+}
+
+
 attributes #0 = { strictfp }
 
 @llvm.fp.env = thread_local global i8 zeroinitializer, section "llvm.metadata"
@@ -2771,6 +2823,7 @@ declare double @llvm.experimental.constrained.pow.f64(double, double, metadata,
 declare double @llvm.experimental.constrained.powi.f64(double, i32, metadata, metadata)
 declare double @llvm.experimental.constrained.sin.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.cos.f64(double, metadata, metadata)
+declare double @llvm.experimental.constrained.tan.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.exp.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.exp2.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.log.f64(double, metadata, metadata)
diff --git a/llvm/test/CodeGen/X86/fp-strict-libcalls-msvc32.ll b/llvm/test/CodeGen/X86/fp-strict-libcalls-msvc32.ll
index 1bc308bef8ccc..cfec52c0e6886 100644
--- a/llvm/test/CodeGen/X86/fp-strict-libcalls-msvc32.ll
+++ b/llvm/test/CodeGen/X86/fp-strict-libcalls-msvc32.ll
@@ -160,6 +160,23 @@ define float @sin(float %x) #0 {
   ret float %result
 }
 
+define float @tan(float %x) #0 {
+; CHECK-LABEL: tan:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    subl $12, %esp
+; CHECK-NEXT:    flds {{[0-9]+}}(%esp)
+; CHECK-NEXT:    fstpl (%esp)
+; CHECK-NEXT:    wait
+; CHECK-NEXT:    calll _tan
+; CHECK-NEXT:    fstps {{[0-9]+}}(%esp)
+; CHECK-NEXT:    flds {{[0-9]+}}(%esp)
+; CHECK-NEXT:    wait
+; CHECK-NEXT:    addl $12, %esp
+; CHECK-NEXT:    retl
+  %result = call float @llvm.experimental.constrained.tan.f32(float %x, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
+  ret float %result
+}
+
 attributes #0 = { strictfp }
 
 declare float @llvm.experimental.constrained.ceil.f32(float, metadata)
@@ -171,3 +188,4 @@ declare float @llvm.experimental.constrained.log.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.log10.f32(float, metadata, metadata)
 declare float @llvm.experimental.constrained.pow.f32(float, float, metadata, metadata)
 declare float @llvm.experimental.constrained.sin.f32(float, metadata, metadata)
+declare float @llvm.experimental.constrained.tan.f32(float, metadata, metadata)
diff --git a/llvm/test/CodeGen/X86/fp128-libcalls-strict.ll b/llvm/test/CodeGen/X86/fp128-libcalls-strict.ll
index f1d473f81a9fa..bd51f553587db 100644
--- a/llvm/test/CodeGen/X86/fp128-libcalls-strict.ll
+++ b/llvm/test/CodeGen/X86/fp128-libcalls-strict.ll
@@ -1047,6 +1047,46 @@ entry:
   ret fp128 %sqrt
 }
 
+define fp128 @tan(fp128 %x) nounwind strictfp {
+; ANDROID-LABEL: tan:
+; ANDROID:       # %bb.0: # %entry
+; ANDROID-NEXT:    pushq %rax
+; ANDROID-NEXT:    callq tanl at PLT
+; ANDROID-NEXT:    popq %rax
+; ANDROID-NEXT:    retq
+;
+; GNU-LABEL: tan:
+; GNU:       # %bb.0: # %entry
+; GNU-NEXT:    pushq %rax
+; GNU-NEXT:    callq tanf128 at PLT
+; GNU-NEXT:    popq %rax
+; GNU-NEXT:    retq
+;
+; X86-LABEL: tan:
+; X86:       # %bb.0: # %entry
+; X86-NEXT:    pushl %esi
+; X86-NEXT:    subl $24, %esp
+; X86-NEXT:    movl {{[0-9]+}}(%esp), %esi
+; X86-NEXT:    subl $12, %esp
+; X86-NEXT:    leal {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    pushl {{[0-9]+}}(%esp)
+; X86-NEXT:    pushl {{[0-9]+}}(%esp)
+; X86-NEXT:    pushl {{[0-9]+}}(%esp)
+; X86-NEXT:    pushl {{[0-9]+}}(%esp)
+; X86-NEXT:    pushl %eax
+; X86-NEXT:    calll tanl
+; X86-NEXT:    addl $28, %esp
+; X86-NEXT:    movaps (%esp), %xmm0
+; X86-NEXT:    movaps %xmm0, (%esi)
+; X86-NEXT:    movl %esi, %eax
+; X86-NEXT:    addl $24, %esp
+; X86-NEXT:    popl %esi
+; X86-NEXT:    retl $4
+entry:
+  %tan = call fp128 @llvm.experimental.constrained.tan.f128(fp128 %x, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
+  ret fp128 %tan
+}
+
 define fp128 @trunc(fp128 %x) nounwind strictfp {
 ; ANDROID-LABEL: trunc:
 ; ANDROID:       # %bb.0: # %entry
@@ -1663,6 +1703,7 @@ declare fp128 @llvm.experimental.constrained.round.f128(fp128, metadata)
 declare fp128 @llvm.experimental.constrained.roundeven.f128(fp128, metadata)
 declare fp128 @llvm.experimental.constrained.sin.f128(fp128, metadata, metadata)
 declare fp128 @llvm.experimental.constrained.sqrt.f128(fp128, metadata, metadata)
+declare fp128 @llvm.experimental.constrained.tan.f128(fp128, metadata, metadata)
 declare fp128 @llvm.experimental.constrained.trunc.f128(fp128, metadata)
 declare i32 @llvm.experimental.constrained.lrint.i32.f128(fp128, metadata, metadata)
 declare i64 @llvm.experimental.constrained.llrint.i64.f128(fp128, metadata, metadata)
diff --git a/llvm/test/CodeGen/X86/fp80-strict-libcalls.ll b/llvm/test/CodeGen/X86/fp80-strict-libcalls.ll
index 4d50b15e5c185..89729975cfd61 100644
--- a/llvm/test/CodeGen/X86/fp80-strict-libcalls.ll
+++ b/llvm/test/CodeGen/X86/fp80-strict-libcalls.ll
@@ -504,6 +504,31 @@ entry:
   ret x86_fp80 %sin
 }
 
+define x86_fp80 @tan(x86_fp80 %x) nounwind strictfp {
+; X86-LABEL: tan:
+; X86:       # %bb.0: # %entry
+; X86-NEXT:    subl $12, %esp
+; X86-NEXT:    fldt {{[0-9]+}}(%esp)
+; X86-NEXT:    fstpt (%esp)
+; X86-NEXT:    wait
+; X86-NEXT:    calll tanl
+; X86-NEXT:    addl $12, %esp
+; X86-NEXT:    retl
+;
+; X64-LABEL: tan:
+; X64:       # %bb.0: # %entry
+; X64-NEXT:    subq $24, %rsp
+; X64-NEXT:    fldt {{[0-9]+}}(%rsp)
+; X64-NEXT:    fstpt (%rsp)
+; X64-NEXT:    wait
+; X64-NEXT:    callq tanl at PLT
+; X64-NEXT:    addq $24, %rsp
+; X64-NEXT:    retq
+entry:
+  %tan = call x86_fp80 @llvm.experimental.constrained.tan.f80(x86_fp80 %x, metadata !"round.dynamic", metadata !"fpexcept.strict") #0
+  ret x86_fp80 %tan
+}
+
 define x86_fp80 @trunc(x86_fp80 %x) nounwind strictfp {
 ; X86-LABEL: trunc:
 ; X86:       # %bb.0: # %entry
@@ -650,6 +675,7 @@ declare x86_fp80 @llvm.experimental.constrained.rint.f80(x86_fp80, metadata, met
 declare x86_fp80 @llvm.experimental.constrained.round.f80(x86_fp80, metadata)
 declare x86_fp80 @llvm.experimental.constrained.roundeven.f80(x86_fp80, metadata)
 declare x86_fp80 @llvm.experimental.constrained.sin.f80(x86_fp80, metadata, metadata)
+declare x86_fp80 @llvm.experimental.constrained.tan.f80(x86_fp80, metadata, metadata)
 declare x86_fp80 @llvm.experimental.constrained.trunc.f80(x86_fp80, metadata)
 declare i32 @llvm.experimental.constrained.lrint.i32.f80(x86_fp80, metadata, metadata)
 declare i64 @llvm.experimental.constrained.llrint.i64.f80(x86_fp80, metadata, metadata)
diff --git a/llvm/test/CodeGen/X86/vector-constrained-fp-intrinsics.ll b/llvm/test/CodeGen/X86/vector-constrained-fp-intrinsics.ll
index 0adb9ddfc426a..d71fd470651cf 100644
--- a/llvm/test/CodeGen/X86/vector-constrained-fp-intrinsics.ll
+++ b/llvm/test/CodeGen/X86/vector-constrained-fp-intrinsics.ll
@@ -7771,6 +7771,234 @@ define <16 x float> @vpaddd_mask_test(<16 x float> %i, <16 x float> %j, <16 x i3
   %r = select <16 x i1> %mask, <16 x float> %x, <16 x float> %i
   ret <16 x float> %r
 }
+
+define <1 x float> @constrained_vector_tan_v1f32() #0 {
+; CHECK-LABEL: constrained_vector_tan_v1f32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-NEXT:    movss {{.*#+}} xmm0 = [4.2E+1,0.0E+0,0.0E+0,0.0E+0]
+; CHECK-NEXT:    callq tanf at PLT
+; CHECK-NEXT:    popq %rax
+; CHECK-NEXT:    .cfi_def_cfa_offset 8
+; CHECK-NEXT:    retq
+;
+; AVX-LABEL: constrained_vector_tan_v1f32:
+; AVX:       # %bb.0: # %entry
+; AVX-NEXT:    pushq %rax
+; AVX-NEXT:    .cfi_def_cfa_offset 16
+; AVX-NEXT:    vmovss {{.*#+}} xmm0 = [4.2E+1,0.0E+0,0.0E+0,0.0E+0]
+; AVX-NEXT:    callq tanf at PLT
+; AVX-NEXT:    popq %rax
+; AVX-NEXT:    .cfi_def_cfa_offset 8
+; AVX-NEXT:    retq
+entry:
+  %tan = call <1 x float> @llvm.experimental.constrained.tan.v1f32(
+                             <1 x float> <float 42.0>,
+                             metadata !"round.dynamic",
+                             metadata !"fpexcept.strict") #0
+  ret <1 x float> %tan
+}
+
+define <2 x double> @constrained_vector_tan_v2f64() #0 {
+; CHECK-LABEL: constrained_vector_tan_v2f64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    subq $24, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 32
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2100000000000001E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    movaps %xmm0, (%rsp) # 16-byte Spill
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    unpcklpd (%rsp), %xmm0 # 16-byte Folded Reload
+; CHECK-NEXT:    # xmm0 = xmm0[0],mem[0]
+; CHECK-NEXT:    addq $24, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 8
+; CHECK-NEXT:    retq
+;
+; AVX-LABEL: constrained_vector_tan_v2f64:
+; AVX:       # %bb.0: # %entry
+; AVX-NEXT:    subq $24, %rsp
+; AVX-NEXT:    .cfi_def_cfa_offset 32
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2100000000000001E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vmovaps %xmm0, (%rsp) # 16-byte Spill
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vunpcklpd (%rsp), %xmm0, %xmm0 # 16-byte Folded Reload
+; AVX-NEXT:    # xmm0 = xmm0[0],mem[0]
+; AVX-NEXT:    addq $24, %rsp
+; AVX-NEXT:    .cfi_def_cfa_offset 8
+; AVX-NEXT:    retq
+entry:
+  %tan = call <2 x double> @llvm.experimental.constrained.tan.v2f64(
+                             <2 x double> <double 42.0, double 42.1>,
+                             metadata !"round.dynamic",
+                             metadata !"fpexcept.strict") #0
+  ret <2 x double> %tan
+}
+
+define <3 x float> @constrained_vector_tan_v3f32() #0 {
+; CHECK-LABEL: constrained_vector_tan_v3f32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    subq $40, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 48
+; CHECK-NEXT:    movss {{.*#+}} xmm0 = [4.4E+1,0.0E+0,0.0E+0,0.0E+0]
+; CHECK-NEXT:    callq tanf at PLT
+; CHECK-NEXT:    movaps %xmm0, {{[-0-9]+}}(%r{{[sb]}}p) # 16-byte Spill
+; CHECK-NEXT:    movss {{.*#+}} xmm0 = [4.2E+1,0.0E+0,0.0E+0,0.0E+0]
+; CHECK-NEXT:    callq tanf at PLT
+; CHECK-NEXT:    movaps %xmm0, (%rsp) # 16-byte Spill
+; CHECK-NEXT:    movss {{.*#+}} xmm0 = [4.3E+1,0.0E+0,0.0E+0,0.0E+0]
+; CHECK-NEXT:    callq tanf at PLT
+; CHECK-NEXT:    movaps (%rsp), %xmm1 # 16-byte Reload
+; CHECK-NEXT:    unpcklps {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1]
+; CHECK-NEXT:    unpcklpd {{[-0-9]+}}(%r{{[sb]}}p), %xmm1 # 16-byte Folded Reload
+; CHECK-NEXT:    # xmm1 = xmm1[0],mem[0]
+; CHECK-NEXT:    movaps %xmm1, %xmm0
+; CHECK-NEXT:    addq $40, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 8
+; CHECK-NEXT:    retq
+;
+; AVX-LABEL: constrained_vector_tan_v3f32:
+; AVX:       # %bb.0: # %entry
+; AVX-NEXT:    subq $40, %rsp
+; AVX-NEXT:    .cfi_def_cfa_offset 48
+; AVX-NEXT:    vmovss {{.*#+}} xmm0 = [4.4E+1,0.0E+0,0.0E+0,0.0E+0]
+; AVX-NEXT:    callq tanf at PLT
+; AVX-NEXT:    vmovaps %xmm0, {{[-0-9]+}}(%r{{[sb]}}p) # 16-byte Spill
+; AVX-NEXT:    vmovss {{.*#+}} xmm0 = [4.2E+1,0.0E+0,0.0E+0,0.0E+0]
+; AVX-NEXT:    callq tanf at PLT
+; AVX-NEXT:    vmovaps %xmm0, (%rsp) # 16-byte Spill
+; AVX-NEXT:    vmovss {{.*#+}} xmm0 = [4.3E+1,0.0E+0,0.0E+0,0.0E+0]
+; AVX-NEXT:    callq tanf at PLT
+; AVX-NEXT:    vmovaps (%rsp), %xmm1 # 16-byte Reload
+; AVX-NEXT:    vinsertps {{.*#+}} xmm0 = xmm1[0],xmm0[0],xmm1[2,3]
+; AVX-NEXT:    vinsertps $32, {{[-0-9]+}}(%r{{[sb]}}p), %xmm0, %xmm0 # 16-byte Folded Reload
+; AVX-NEXT:    # xmm0 = xmm0[0,1],mem[0],xmm0[3]
+; AVX-NEXT:    addq $40, %rsp
+; AVX-NEXT:    .cfi_def_cfa_offset 8
+; AVX-NEXT:    retq
+entry:
+  %tan = call <3 x float> @llvm.experimental.constrained.tan.v3f32(
+                              <3 x float> <float 42.0, float 43.0, float 44.0>,
+                              metadata !"round.dynamic",
+                              metadata !"fpexcept.strict") #0
+  ret <3 x float> %tan
+}
+
+define <3 x double> @constrained_vector_tan_v3f64() #0 {
+; CHECK-LABEL: constrained_vector_tan_v3f64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    subq $24, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 32
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2100000000000001E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    movsd %xmm0, {{[-0-9]+}}(%r{{[sb]}}p) # 8-byte Spill
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    movsd %xmm0, (%rsp) # 8-byte Spill
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2200000000000003E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    movsd %xmm0, {{[0-9]+}}(%rsp)
+; CHECK-NEXT:    fldl {{[0-9]+}}(%rsp)
+; CHECK-NEXT:    wait
+; CHECK-NEXT:    movsd (%rsp), %xmm0 # 8-byte Reload
+; CHECK-NEXT:    # xmm0 = mem[0],zero
+; CHECK-NEXT:    movsd {{[-0-9]+}}(%r{{[sb]}}p), %xmm1 # 8-byte Reload
+; CHECK-NEXT:    # xmm1 = mem[0],zero
+; CHECK-NEXT:    addq $24, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 8
+; CHECK-NEXT:    retq
+;
+; AVX-LABEL: constrained_vector_tan_v3f64:
+; AVX:       # %bb.0: # %entry
+; AVX-NEXT:    subq $40, %rsp
+; AVX-NEXT:    .cfi_def_cfa_offset 48
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2100000000000001E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vmovaps %xmm0, (%rsp) # 16-byte Spill
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vunpcklpd (%rsp), %xmm0, %xmm0 # 16-byte Folded Reload
+; AVX-NEXT:    # xmm0 = xmm0[0],mem[0]
+; AVX-NEXT:    vmovups %ymm0, (%rsp) # 32-byte Spill
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2200000000000003E+1,0.0E+0]
+; AVX-NEXT:    vzeroupper
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vmovups (%rsp), %ymm1 # 32-byte Reload
+; AVX-NEXT:    vinsertf128 $1, %xmm0, %ymm1, %ymm0
+; AVX-NEXT:    addq $40, %rsp
+; AVX-NEXT:    .cfi_def_cfa_offset 8
+; AVX-NEXT:    retq
+entry:
+  %tan = call <3 x double> @llvm.experimental.constrained.tan.v3f64(
+                          <3 x double> <double 42.0, double 42.1, double 42.2>,
+                          metadata !"round.dynamic",
+                          metadata !"fpexcept.strict") #0
+  ret <3 x double> %tan
+}
+
+define <4 x double> @constrained_vector_tan_v4f64() #0 {
+; CHECK-LABEL: constrained_vector_tan_v4f64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    subq $40, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 48
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2100000000000001E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    movaps %xmm0, (%rsp) # 16-byte Spill
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    unpcklpd (%rsp), %xmm0 # 16-byte Folded Reload
+; CHECK-NEXT:    # xmm0 = xmm0[0],mem[0]
+; CHECK-NEXT:    movaps %xmm0, (%rsp) # 16-byte Spill
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2299999999999997E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    movaps %xmm0, {{[-0-9]+}}(%r{{[sb]}}p) # 16-byte Spill
+; CHECK-NEXT:    movsd {{.*#+}} xmm0 = [4.2200000000000003E+1,0.0E+0]
+; CHECK-NEXT:    callq tan at PLT
+; CHECK-NEXT:    movaps %xmm0, %xmm1
+; CHECK-NEXT:    unpcklpd {{[-0-9]+}}(%r{{[sb]}}p), %xmm1 # 16-byte Folded Reload
+; CHECK-NEXT:    # xmm1 = xmm1[0],mem[0]
+; CHECK-NEXT:    movaps (%rsp), %xmm0 # 16-byte Reload
+; CHECK-NEXT:    addq $40, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 8
+; CHECK-NEXT:    retq
+;
+; AVX-LABEL: constrained_vector_tan_v4f64:
+; AVX:       # %bb.0: # %entry
+; AVX-NEXT:    subq $40, %rsp
+; AVX-NEXT:    .cfi_def_cfa_offset 48
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2299999999999997E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vmovaps %xmm0, (%rsp) # 16-byte Spill
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2200000000000003E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vunpcklpd (%rsp), %xmm0, %xmm0 # 16-byte Folded Reload
+; AVX-NEXT:    # xmm0 = xmm0[0],mem[0]
+; AVX-NEXT:    vmovaps %xmm0, (%rsp) # 16-byte Spill
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2100000000000001E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vmovaps %xmm0, {{[-0-9]+}}(%r{{[sb]}}p) # 16-byte Spill
+; AVX-NEXT:    vmovsd {{.*#+}} xmm0 = [4.2E+1,0.0E+0]
+; AVX-NEXT:    callq tan at PLT
+; AVX-NEXT:    vunpcklpd {{[-0-9]+}}(%r{{[sb]}}p), %xmm0, %xmm0 # 16-byte Folded Reload
+; AVX-NEXT:    # xmm0 = xmm0[0],mem[0]
+; AVX-NEXT:    vinsertf128 $1, (%rsp), %ymm0, %ymm0 # 16-byte Folded Reload
+; AVX-NEXT:    addq $40, %rsp
+; AVX-NEXT:    .cfi_def_cfa_offset 8
+; AVX-NEXT:    retq
+entry:
+  %tan = call <4 x double> @llvm.experimental.constrained.tan.v4f64(
+                             <4 x double> <double 42.0, double 42.1,
+                                           double 42.2, double 42.3>,
+                             metadata !"round.dynamic",
+                             metadata !"fpexcept.strict") #0
+  ret <4 x double> %tan
+}
+
+
+
 declare  <16 x float> @llvm.experimental.constrained.fadd.v16f32(<16 x float>, <16 x float>, metadata, metadata)
 
 attributes #0 = { strictfp }
@@ -7786,6 +8014,7 @@ declare <2 x double> @llvm.experimental.constrained.pow.v2f64(<2 x double>, <2 x
 declare <2 x double> @llvm.experimental.constrained.powi.v2f64(<2 x double>, i32, metadata, metadata)
 declare <2 x double> @llvm.experimental.constrained.sin.v2f64(<2 x double>, metadata, metadata)
 declare <2 x double> @llvm.experimental.constrained.cos.v2f64(<2 x double>, metadata, metadata)
+declare <2 x double> @llvm.experimental.constrained.tan.v2f64(<2 x double>, metadata, metadata)
 declare <2 x double> @llvm.experimental.constrained.exp.v2f64(<2 x double>, metadata, metadata)
 declare <2 x double> @llvm.experimental.constrained.exp2.v2f64(<2 x double>, metadata, metadata)
 declare <2 x double> @llvm.experimental.constrained.log.v2f64(<2 x double>, metadata, metadata)
@@ -7829,6 +8058,7 @@ declare <1 x float> @llvm.experimental.constrained.pow.v1f32(<1 x float>, <1 x f
 declare <1 x float> @llvm.experimental.constrained.powi.v1f32(<1 x float>, i32, metadata, metadata)
 declare <1 x float> @llvm.experimental.constrained.sin.v1f32(<1 x float>, metadata, metadata)
 declare <1 x float> @llvm.experimental.constrained.cos.v1f32(<1 x float>, metadata, metadata)
+declare <1 x float> @llvm.experimental.constrained.tan.v1f32(<1 x float>, metadata, metadata)
 declare <1 x float> @llvm.experimental.constrained.exp.v1f32(<1 x float>, metadata, metadata)
 declare <1 x float> @llvm.experimental.constrained.exp2.v1f32(<1 x float>, metadata, metadata)
 declare <1 x float> @llvm.experimental.constrained.log.v1f32(<1 x float>, metadata, metadata)
@@ -7882,6 +8112,8 @@ declare <3 x float> @llvm.experimental.constrained.sin.v3f32(<3 x float>, metada
 declare <3 x double> @llvm.experimental.constrained.sin.v3f64(<3 x double>, metadata, metadata)
 declare <3 x float> @llvm.experimental.constrained.cos.v3f32(<3 x float>, metadata, metadata)
 declare <3 x double> @llvm.experimental.constrained.cos.v3f64(<3 x double>, metadata, metadata)
+declare <3 x float> @llvm.experimental.constrained.tan.v3f32(<3 x float>, metadata, metadata)
+declare <3 x double> @llvm.experimental.constrained.tan.v3f64(<3 x double>, metadata, metadata)
 declare <3 x float> @llvm.experimental.constrained.exp.v3f32(<3 x float>, metadata, metadata)
 declare <3 x double> @llvm.experimental.constrained.exp.v3f64(<3 x double>, metadata, metadata)
 declare <3 x float> @llvm.experimental.constrained.exp2.v3f32(<3 x float>, metadata, metadata)
@@ -7938,6 +8170,7 @@ declare <4 x double> @llvm.experimental.constrained.pow.v4f64(<4 x double>, <4 x
 declare <4 x double> @llvm.experimental.constrained.powi.v4f64(<4 x double>, i32, metadata, metadata)
 declare <4 x double> @llvm.experimental.constrained.sin.v4f64(<4 x double>, metadata, metadata)
 declare <4 x double> @llvm.experimental.constrained.cos.v4f64(<4 x double>, metadata, metadata)
+declare <4 x double> @llvm.experimental.constrained.tan.v4f64(<4 x double>, metadata, metadata)
 declare <4 x double> @llvm.experimental.constrained.exp.v4f64(<4 x double>, metadata, metadata)
 declare <4 x double> @llvm.experimental.constrained.exp2.v4f64(<4 x double>, metadata, metadata)
 declare <4 x double> @llvm.experimental.constrained.log.v4f64(<4 x double>, metadata, metadata)
diff --git a/llvm/test/Feature/fp-intrinsics.ll b/llvm/test/Feature/fp-intrinsics.ll
index 7759813dc2e11..78275a16d3e8f 100644
--- a/llvm/test/Feature/fp-intrinsics.ll
+++ b/llvm/test/Feature/fp-intrinsics.ll
@@ -418,6 +418,7 @@ declare double @llvm.experimental.constrained.pow.f64(double, double, metadata,
 declare double @llvm.experimental.constrained.powi.f64(double, i32, metadata, metadata)
 declare double @llvm.experimental.constrained.sin.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.cos.f64(double, metadata, metadata)
+declare double @llvm.experimental.constrained.tan.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.exp.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.exp2.f64(double, metadata, metadata)
 declare double @llvm.experimental.constrained.log.f64(double, metadata, metadata)



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