[clang] Add support for -fcx-limited-range and #pragma CX_LIMTED_RANGE. (PR #68820)
Zahira Ammarguellat via cfe-commits
cfe-commits at lists.llvm.org
Wed Oct 11 10:12:45 PDT 2023
https://github.com/zahiraam created https://github.com/llvm/llvm-project/pull/68820
None
>From 91de35737b74233f29da76573b4099bf64e8bdd4 Mon Sep 17 00:00:00 2001
From: Ammarguellat <zahira.ammarguellat at intel.com>
Date: Tue, 10 Oct 2023 08:31:41 -0700
Subject: [PATCH] Add support for -fcx-limited-range and #pragma
CX_LIMTED_RANGE.
---
clang/include/clang/Basic/FPOptions.def | 1 +
clang/include/clang/Basic/LangOptions.def | 2 +
clang/include/clang/Basic/TokenKinds.def | 5 ++
clang/include/clang/Driver/Options.td | 6 ++
clang/include/clang/Parse/Parser.h | 4 ++
clang/include/clang/Sema/Sema.h | 4 ++
clang/lib/CodeGen/CGExprComplex.cpp | 59 ++++++++++------
clang/lib/Driver/ToolChains/Clang.cpp | 2 +
clang/lib/Parse/ParsePragma.cpp | 40 ++++++++++-
clang/lib/Parse/ParseStmt.cpp | 10 +++
clang/lib/Parse/Parser.cpp | 3 +
clang/lib/Sema/SemaAttr.cpp | 7 ++
clang/test/CodeGen/cx-full-range.c | 22 ++++++
clang/test/CodeGen/pragma-cx-limited-range.c | 73 ++++++++++++++++++++
clang/test/CodeGenCXX/cx-limited-range.c | 18 +++++
15 files changed, 233 insertions(+), 23 deletions(-)
create mode 100644 clang/test/CodeGen/cx-full-range.c
create mode 100644 clang/test/CodeGen/pragma-cx-limited-range.c
create mode 100644 clang/test/CodeGenCXX/cx-limited-range.c
diff --git a/clang/include/clang/Basic/FPOptions.def b/clang/include/clang/Basic/FPOptions.def
index 5b923a1944e509a..9e56d7fcf26fdcf 100644
--- a/clang/include/clang/Basic/FPOptions.def
+++ b/clang/include/clang/Basic/FPOptions.def
@@ -28,4 +28,5 @@ OPTION(FPEvalMethod, LangOptions::FPEvalMethodKind, 2, AllowApproxFunc)
OPTION(Float16ExcessPrecision, LangOptions::ExcessPrecisionKind, 2, FPEvalMethod)
OPTION(BFloat16ExcessPrecision, LangOptions::ExcessPrecisionKind, 2, Float16ExcessPrecision)
OPTION(MathErrno, bool, 1, BFloat16ExcessPrecision)
+OPTION(CxLimitedRange, bool, 1, MathErrno)
#undef OPTION
diff --git a/clang/include/clang/Basic/LangOptions.def b/clang/include/clang/Basic/LangOptions.def
index c0ea4ecb9806a5b..47513522a0d7719 100644
--- a/clang/include/clang/Basic/LangOptions.def
+++ b/clang/include/clang/Basic/LangOptions.def
@@ -219,6 +219,8 @@ BENIGN_LANGOPT(NoSignedZero , 1, 0, "Permit Floating Point optimization wit
BENIGN_LANGOPT(AllowRecip , 1, 0, "Permit Floating Point reciprocal")
BENIGN_LANGOPT(ApproxFunc , 1, 0, "Permit Floating Point approximation")
+LANGOPT(CxLimitedRange, 1, 0, "Enable use of algebraic expansions of complex arithmetics.")
+
BENIGN_LANGOPT(ObjCGCBitmapPrint , 1, 0, "printing of GC's bitmap layout for __weak/__strong ivars")
BENIGN_LANGOPT(AccessControl , 1, 1, "C++ access control")
diff --git a/clang/include/clang/Basic/TokenKinds.def b/clang/include/clang/Basic/TokenKinds.def
index 94db56a9fd5d78c..5cd81a66ab57bc1 100644
--- a/clang/include/clang/Basic/TokenKinds.def
+++ b/clang/include/clang/Basic/TokenKinds.def
@@ -904,6 +904,11 @@ PRAGMA_ANNOTATION(pragma_fenv_access_ms)
// handles them.
PRAGMA_ANNOTATION(pragma_fenv_round)
+// Annotation for #pragma STDC CX_LIMITED_RANGE
+// The lexer produces these so that they only take effect when the parser
+// handles them.
+PRAGMA_ANNOTATION(pragma_cx_limited_range)
+
// Annotation for #pragma float_control
// The lexer produces these so that they only take effect when the parser
// handles them.
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index ff2130c93f28ea0..a871bea6cf14cd4 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -1001,6 +1001,12 @@ defm offload_uniform_block : BoolFOption<"offload-uniform-block",
NegFlag<SetFalse, [], [ClangOption, CC1Option], "Don't assume">,
BothFlags<[], [ClangOption], " that kernels are launched with uniform block sizes (default true for CUDA/HIP and false otherwise)">>;
+def fcx_limited_range : Joined<["-"], "fcx-limited-range">,
+ Group<f_Group>, Visibility<[ClangOption, CC1Option]>,
+ HelpText<"Basic algebraic expansions of some arithmetic operations involving "
+ "data of type COMPLEX are disabled.">,
+ MarshallingInfoFlag<LangOpts<"CxLimitedRange">>;
+
// OpenCL-only Options
def cl_opt_disable : Flag<["-"], "cl-opt-disable">, Group<opencl_Group>,
Visibility<[ClangOption, CC1Option]>,
diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
index 0e969f341bbe19f..8f2b4d50fd59e5b 100644
--- a/clang/include/clang/Parse/Parser.h
+++ b/clang/include/clang/Parse/Parser.h
@@ -767,6 +767,10 @@ class Parser : public CodeCompletionHandler {
/// #pragma STDC FENV_ROUND...
void HandlePragmaFEnvRound();
+ /// Handle the annotation token produced for
+ /// #pragma STDC CX_LIMITED_RANGE...
+ void HandlePragmaCXLimitedRange();
+
/// Handle the annotation token produced for
/// #pragma float_control
void HandlePragmaFloatControl();
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 5bef0335f7891c9..f206f5de1310e1b 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -10948,6 +10948,10 @@ class Sema final {
/// \#pragma STDC FENV_ACCESS
void ActOnPragmaFEnvAccess(SourceLocation Loc, bool IsEnabled);
+ /// ActOnPragmaCXLimitedRange - Called on well formed
+ /// \#pragma STDC CX_LIMITED_RANGE
+ void ActOnPragmaCXLimitedRange(SourceLocation Loc, bool IsEnabled);
+
/// Called on well formed '\#pragma clang fp' that has option 'exceptions'.
void ActOnPragmaFPExceptions(SourceLocation Loc,
LangOptions::FPExceptionModeKind);
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index f3cbd1d0451ebe4..f18fdb17090968b 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -761,6 +761,21 @@ ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
if (Op.LHS.second && Op.RHS.second) {
+ // (a+ib)*(c+id) = (ac-bd)+i(bc+ad)
+ if (Op.FPFeatures.getCxLimitedRange() ||
+ CGF.getLangOpts().CxLimitedRange) {
+ llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
+ llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
+
+ llvm::Value *AC = Builder.CreateFMul(LHSr, RHSr); // ac
+ llvm::Value *BD = Builder.CreateFMul(LHSi, RHSi); // bd
+ llvm::Value *DSTr = Builder.CreateFSub(AC, BD); // ac-bd
+
+ llvm::Value *BC = Builder.CreateFMul(LHSi, RHSr); // bc
+ llvm::Value *AD = Builder.CreateFMul(LHSr, RHSi); // ad
+ llvm::Value *DSTi = Builder.CreateFAdd(BC, AD); // bc+ad
+ return ComplexPairTy(DSTr, DSTi);
+ }
// If both operands are complex, emit the core math directly, and then
// test for NaNs. If we find NaNs in the result, we delegate to a libcall
// to carefully re-compute the correct infinity representation if
@@ -851,9 +866,30 @@ ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
-
llvm::Value *DSTr, *DSTi;
if (LHSr->getType()->isFloatingPointTy()) {
+ CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
+ if (RHSi && (Op.FPFeatures.getCxLimitedRange() ||
+ CGF.getLangOpts().CxLimitedRange)) {
+ if (!LHSi)
+ LHSi = llvm::Constant::getNullValue(RHSi->getType());
+
+ // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
+ llvm::Value *AC = Builder.CreateFMul(LHSr, RHSr); // a*c
+ llvm::Value *BD = Builder.CreateFMul(LHSi, RHSi); // b*d
+ llvm::Value *ACpBD = Builder.CreateFAdd(AC, BD); // ac+bd
+
+ llvm::Value *CC = Builder.CreateFMul(RHSr, RHSr); // c*c
+ llvm::Value *DD = Builder.CreateFMul(RHSi, RHSi); // d*d
+ llvm::Value *CCpDD = Builder.CreateFAdd(CC, DD); // cc+dd
+
+ llvm::Value *BC = Builder.CreateFMul(LHSi, RHSr); // b*c
+ llvm::Value *AD = Builder.CreateFMul(LHSr, RHSi); // a*d
+ llvm::Value *BCmAD = Builder.CreateFSub(BC, AD); // bc-ad
+
+ DSTr = Builder.CreateFDiv(ACpBD, CCpDD);
+ DSTi = Builder.CreateFDiv(BCmAD, CCpDD);
+ } else if (RHSi && !CGF.getLangOpts().FastMath) {
// If we have a complex operand on the RHS and FastMath is not allowed, we
// delegate to a libcall to handle all of the complexities and minimize
// underflow/overflow cases. When FastMath is allowed we construct the
@@ -861,8 +897,6 @@ ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
//
// FIXME: We would be able to avoid the libcall in many places if we
// supported imaginary types in addition to complex types.
- CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Op.FPFeatures);
- if (RHSi && !CGF.getLangOpts().FastMath) {
BinOpInfo LibCallOp = Op;
// If LHS was a real, supply a null imaginary part.
if (!LHSi)
@@ -884,25 +918,6 @@ ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
case llvm::Type::FP128TyID:
return EmitComplexBinOpLibCall("__divtc3", LibCallOp);
}
- } else if (RHSi) {
- if (!LHSi)
- LHSi = llvm::Constant::getNullValue(RHSi->getType());
-
- // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
- llvm::Value *AC = Builder.CreateFMul(LHSr, RHSr); // a*c
- llvm::Value *BD = Builder.CreateFMul(LHSi, RHSi); // b*d
- llvm::Value *ACpBD = Builder.CreateFAdd(AC, BD); // ac+bd
-
- llvm::Value *CC = Builder.CreateFMul(RHSr, RHSr); // c*c
- llvm::Value *DD = Builder.CreateFMul(RHSi, RHSi); // d*d
- llvm::Value *CCpDD = Builder.CreateFAdd(CC, DD); // cc+dd
-
- llvm::Value *BC = Builder.CreateFMul(LHSi, RHSr); // b*c
- llvm::Value *AD = Builder.CreateFMul(LHSr, RHSi); // a*d
- llvm::Value *BCmAD = Builder.CreateFSub(BC, AD); // bc-ad
-
- DSTr = Builder.CreateFDiv(ACpBD, CCpDD);
- DSTi = Builder.CreateFDiv(BCmAD, CCpDD);
} else {
assert(LHSi && "Can have at most one non-complex operand!");
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 129adfb9fcc74d1..40d66713d34040e 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2812,6 +2812,8 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
CmdArgs.push_back("-mlimit-float-precision");
CmdArgs.push_back(A->getValue());
}
+ if (const Arg *A = Args.getLastArg(options::OPT_fcx_limited_range))
+ CmdArgs.push_back("-fcx-limited-range");
for (const Arg *A : Args) {
auto optID = A->getOption().getID();
diff --git a/clang/lib/Parse/ParsePragma.cpp b/clang/lib/Parse/ParsePragma.cpp
index b3178aef64d72d7..eae4b54ecfc545c 100644
--- a/clang/lib/Parse/ParsePragma.cpp
+++ b/clang/lib/Parse/ParsePragma.cpp
@@ -137,7 +137,20 @@ struct PragmaSTDC_CX_LIMITED_RANGEHandler : public PragmaHandler {
void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
Token &Tok) override {
tok::OnOffSwitch OOS;
- PP.LexOnOffSwitch(OOS);
+ if (PP.LexOnOffSwitch(OOS))
+ return;
+
+ MutableArrayRef<Token> Toks(
+ PP.getPreprocessorAllocator().Allocate<Token>(1), 1);
+
+ Toks[0].startToken();
+ Toks[0].setKind(tok::annot_pragma_cx_limited_range);
+ Toks[0].setLocation(Tok.getLocation());
+ Toks[0].setAnnotationEndLoc(Tok.getLocation());
+ Toks[0].setAnnotationValue(
+ reinterpret_cast<void *>(static_cast<uintptr_t>(OOS)));
+ PP.EnterTokenStream(Toks, /*DisableMacroExpansion=*/true,
+ /*IsReinject=*/false);
}
};
@@ -846,6 +859,31 @@ void Parser::HandlePragmaFEnvRound() {
Actions.ActOnPragmaFEnvRound(PragmaLoc, RM);
}
+void Parser::HandlePragmaCXLimitedRange() {
+ assert(Tok.is(tok::annot_pragma_cx_limited_range));
+ tok::OnOffSwitch OOS = static_cast<tok::OnOffSwitch>(
+ reinterpret_cast<uintptr_t>(Tok.getAnnotationValue()));
+
+ bool IsEnabled;
+ switch (OOS) {
+ case tok::OOS_ON:
+ IsEnabled = true;
+ break;
+ case tok::OOS_OFF:
+ IsEnabled = false;
+ break;
+ case tok::OOS_DEFAULT:
+ // According to ISO C99 standard chapter 7.3.4, the default value
+ // for the pragma is ``off'. In GCC, the option -fcx-limited-range
+ // controls the default setting of the pragma.
+ IsEnabled = getLangOpts().CxLimitedRange ? true : false;
+ break;
+ }
+
+ SourceLocation PragmaLoc = ConsumeAnnotationToken();
+ Actions.ActOnPragmaCXLimitedRange(PragmaLoc, IsEnabled);
+}
+
StmtResult Parser::HandlePragmaCaptured()
{
assert(Tok.is(tok::annot_pragma_captured));
diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
index 2531147c23196ae..b6c987c4b046b41 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -447,6 +447,13 @@ StmtResult Parser::ParseStatementOrDeclarationAfterAttributes(
ConsumeAnnotationToken();
return StmtError();
+ case tok::annot_pragma_cx_limited_range:
+ ProhibitAttributes(CXX11Attrs);
+ Diag(Tok, diag::err_pragma_file_or_compound_scope)
+ << "STDC CX_LIMITED_RANGE";
+ ConsumeAnnotationToken();
+ return StmtError();
+
case tok::annot_pragma_float_control:
ProhibitAttributes(CXX11Attrs);
ProhibitAttributes(GNUAttrs);
@@ -1047,6 +1054,9 @@ void Parser::ParseCompoundStatementLeadingPragmas() {
case tok::annot_pragma_fenv_round:
HandlePragmaFEnvRound();
break;
+ case tok::annot_pragma_cx_limited_range:
+ HandlePragmaCXLimitedRange();
+ break;
case tok::annot_pragma_float_control:
HandlePragmaFloatControl();
break;
diff --git a/clang/lib/Parse/Parser.cpp b/clang/lib/Parse/Parser.cpp
index 0f930248e77174b..befa6eba0885f29 100644
--- a/clang/lib/Parse/Parser.cpp
+++ b/clang/lib/Parse/Parser.cpp
@@ -836,6 +836,9 @@ Parser::ParseExternalDeclaration(ParsedAttributes &Attrs,
case tok::annot_pragma_fenv_round:
HandlePragmaFEnvRound();
return nullptr;
+ case tok::annot_pragma_cx_limited_range:
+ HandlePragmaCXLimitedRange();
+ return nullptr;
case tok::annot_pragma_float_control:
HandlePragmaFloatControl();
return nullptr;
diff --git a/clang/lib/Sema/SemaAttr.cpp b/clang/lib/Sema/SemaAttr.cpp
index 6dadf01ead4441b..602bc2e5ec62f3c 100644
--- a/clang/lib/Sema/SemaAttr.cpp
+++ b/clang/lib/Sema/SemaAttr.cpp
@@ -1340,6 +1340,13 @@ void Sema::ActOnPragmaFEnvAccess(SourceLocation Loc, bool IsEnabled) {
CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
}
+void Sema::ActOnPragmaCXLimitedRange(SourceLocation Loc, bool IsEnabled) {
+ FPOptionsOverride NewFPFeatures = CurFPFeatureOverrides();
+ NewFPFeatures.setCxLimitedRangeOverride(IsEnabled);
+ FpPragmaStack.Act(Loc, PSK_Set, StringRef(), NewFPFeatures);
+ CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
+}
+
void Sema::ActOnPragmaFPExceptions(SourceLocation Loc,
LangOptions::FPExceptionModeKind FPE) {
setExceptionMode(Loc, FPE);
diff --git a/clang/test/CodeGen/cx-full-range.c b/clang/test/CodeGen/cx-full-range.c
new file mode 100644
index 000000000000000..85386b84066ec6a
--- /dev/null
+++ b/clang/test/CodeGen/cx-full-range.c
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown \
+// RUN: -o - | FileCheck %s --check-prefix=FULL
+
+_Complex float pragma_off_mul(_Complex float a, _Complex float b) {
+#pragma STDC CX_LIMITED_RANGE OFF
+ // LABEL: define {{.*}} @pragma_on_mul
+ // LIMITED: %[[AC:[^ ]+]] = fmul
+ // LIMITED-NEXT: %[[BD:[^ ]+]] = fmul
+ // LIMITED-NEXT: %[[RR:[^ ]+]] = fsub
+ // LIMITED-NEXT: %[[BC:[^ ]+]] = fmul
+ // LIMITED-NEXT: %[[AD:[^ ]+]] = fmul
+ // LIMITED-NEXT: %[[RI:[^ ]+]] = fadd
+ // LIMITED: ret
+ return a * b;
+}
+
+_Complex float mul(_Complex float a, _Complex float b) {
+ // LABEL: define {{.*}} @mul
+ // FULL: call {{.*}} @__mulsc3(
+ // FULL: ret
+ return a * b;
+}
diff --git a/clang/test/CodeGen/pragma-cx-limited-range.c b/clang/test/CodeGen/pragma-cx-limited-range.c
new file mode 100644
index 000000000000000..78bed931b2ec400
--- /dev/null
+++ b/clang/test/CodeGen/pragma-cx-limited-range.c
@@ -0,0 +1,73 @@
+// RUN: %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown \
+// RUN: -o - | FileCheck %s
+
+_Complex float pragma_on_mul(_Complex float a, _Complex float b) {
+#pragma STDC CX_LIMITED_RANGE ON
+ // LABEL: define {{.*}} @pragma_on_mul
+ // CHECK: %[[AC:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[BD:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[RR:[^ ]+]] = fsub
+ // CHECK-NEXT: %[[BC:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[AD:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[RI:[^ ]+]] = fadd
+ // CHECK: ret
+ return a * b;
+}
+
+_Complex float pragma_off_mul(_Complex float a, _Complex float b) {
+#pragma STDC CX_LIMITED_RANGE OFF
+ // LABEL: define {{.*}} @pragma_off_mul
+ // CHECK: %[[AC:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[BD:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[AD:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[BC:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[RR:[^ ]+]] = fsub
+ // CHECK-NEXT: %[[RI:[^ ]+]] = fadd
+ // CHECK: ret
+ return a * b;
+}
+
+_Complex float no_pragma_mul(_Complex float a, _Complex float b) {
+ // LABEL: define {{.*}} @pragma_off_mul
+ // CHECK: %[[AC:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[BD:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[AD:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[BC:[^ ]+]] = fmul
+ // CHECK-NEXT: %[[RR:[^ ]+]] = fsub
+ // CHECK-NEXT: %[[RI:[^ ]+]] = fadd
+ // CHECK: ret
+ return a * b;
+}
+
+_Complex float pragma_on_div(_Complex float a, _Complex float b) {
+#pragma STDC CX_LIMITED_RANGE ON
+ // LABEL: define {{.*}} @pragma_on_div
+ // CHECK: [[AC:%.*]] = fmul
+ // CHECK: [[BD:%.*]] = fmul
+ // CHECK: [[ACpBD:%.*]] = fadd
+ // CHECK: [[CC:%.*]] = fmul
+ // CHECK: [[DD:%.*]] = fmul
+ // CHECK: [[CCpDD:%.*]] = fadd
+ // CHECK: [[BC:%.*]] = fmul
+ // CHECK: [[AD:%.*]] = fmul
+ // CHECK: [[BCmAD:%.*]] = fsub
+ // CHECK: fdiv
+ // CHECK: fdiv
+ // CHECK: ret
+ return a / b;
+}
+
+_Complex float pragma_off_div(_Complex float a, _Complex float b) {
+#pragma STDC CX_LIMITED_RANGE OFF
+ // LABEL: define {{.*}} @pragma_off_div
+ // CHECK: call {{.*}} @__divsc3(
+ // CHECK: ret
+ return a / b;
+}
+
+_Complex float no_pragma_div(_Complex float a, _Complex float b) {
+ // LABEL: define {{.*}} @no_prama_div
+ // CHECK: call {{.*}} @__divsc3(
+ // CHECK: ret
+ return a / b;
+}
diff --git a/clang/test/CodeGenCXX/cx-limited-range.c b/clang/test/CodeGenCXX/cx-limited-range.c
new file mode 100644
index 000000000000000..fce0ee413fb02c9
--- /dev/null
+++ b/clang/test/CodeGenCXX/cx-limited-range.c
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown \
+// RUN: -fcx-limited-range -o - | FileCheck %s
+// RUN %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown -fuse-complex-intrinsics -fcx-range=nonan -o - | FileCheck %s --check-prefixes=CHECK-COMMON,CHECK-NO-NAN
+// RUN %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown -fuse-complex-intrinsics -fcx-range=full -o - | FileCheck %s --check-prefixes=CHECK-COMMON,CHECK-FULL
+
+_Complex float f1(_Complex float a, _Complex float b) {
+#pragma STDC CX_LIMITED_RANGE ON
+ // CHECK: fdiv float
+ // CHECK: fdiv float
+ return a / b;
+}
+
+_Complex float f2(_Complex float a, _Complex float b) {
+#pragma STDC CX_LIMITED_RANGE ON
+ // CHECK: fdiv float
+ // CHECK: fdiv float
+ return a * b;
+}
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