[clang-tools-extra] [lldb] [libc] [llvm] [clang] [libcxxabi] [libunwind] [libcxx] [flang] [lld] [compiler-rt] Fix a bug in Smith's algorithm used in complex div/mul. (PR #78330)

Simon Pilgrim via cfe-commits cfe-commits at lists.llvm.org
Thu Jan 18 07:44:49 PST 2024


https://github.com/RKSimon updated https://github.com/llvm/llvm-project/pull/78330

>From 8f8917528e30d2ba67f669cfd1a893bc85c21121 Mon Sep 17 00:00:00 2001
From: Ammarguellat <zahira.ammarguellat at intel.com>
Date: Tue, 16 Jan 2024 11:24:03 -0800
Subject: [PATCH 1/4] Fixed a bug in Smith's algorithm and made sure last
 option in command line rules.

---
 clang/lib/CodeGen/CGExprComplex.cpp   |  8 ++++++--
 clang/lib/Driver/ToolChains/Clang.cpp | 19 ++++++++++---------
 clang/test/CodeGen/cx-complex-range.c | 16 ++++++++++++++++
 clang/test/Driver/range.c             |  7 +++++++
 4 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index e532794b71bdb4a..6fbd8f19eeb50a4 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -936,7 +936,7 @@ ComplexPairTy ComplexExprEmitter::EmitRangeReductionDiv(llvm::Value *LHSr,
   llvm::Value *RC = Builder.CreateFMul(CdD, RHSr);  // rc
   llvm::Value *DpRC = Builder.CreateFAdd(RHSi, RC); // tmp=d+rc
 
-  llvm::Value *T7 = Builder.CreateFMul(LHSr, RC);    // ar
+  llvm::Value *T7 = Builder.CreateFMul(LHSr, CdD);   // ar
   llvm::Value *T8 = Builder.CreateFAdd(T7, LHSi);    // ar+b
   llvm::Value *DSTFr = Builder.CreateFDiv(T8, DpRC); // (ar+b)/tmp
 
@@ -978,7 +978,11 @@ ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
       return EmitRangeReductionDiv(LHSr, LHSi, RHSr, RHSi);
     else if (Op.FPFeatures.getComplexRange() == LangOptions::CX_Limited)
       return EmitAlgebraicDiv(LHSr, LHSi, RHSr, RHSi);
-    else if (!CGF.getLangOpts().FastMath) {
+    else if (!CGF.getLangOpts().FastMath ||
+             // '-ffast-math' is used in the command line but followed by an
+             // '-fno-cx-limited-range'.
+             (CGF.getLangOpts().FastMath &&
+              Op.FPFeatures.getComplexRange() == LangOptions::CX_Full)) {
       LHSi = OrigLHSi;
       // 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
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 9edae3fec91a87f..0c05d1db3960718 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2753,6 +2753,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
   StringRef Float16ExcessPrecision = "";
   StringRef BFloat16ExcessPrecision = "";
   LangOptions::ComplexRangeKind Range = LangOptions::ComplexRangeKind::CX_Full;
+  std::string ComplexRangeStr = "";
 
   if (const Arg *A = Args.getLastArg(options::OPT_flimited_precision_EQ)) {
     CmdArgs.push_back("-mlimit-float-precision");
@@ -2768,24 +2769,24 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
     case options::OPT_fcx_limited_range: {
       EmitComplexRangeDiag(D, Range, LangOptions::ComplexRangeKind::CX_Limited);
       Range = LangOptions::ComplexRangeKind::CX_Limited;
-      std::string ComplexRangeStr = RenderComplexRangeOption("limited");
-      if (!ComplexRangeStr.empty())
-        CmdArgs.push_back(Args.MakeArgString(ComplexRangeStr));
+      ComplexRangeStr = RenderComplexRangeOption("limited");
       break;
     }
     case options::OPT_fno_cx_limited_range:
+      EmitComplexRangeDiag(D, Range, LangOptions::ComplexRangeKind::CX_Full);
       Range = LangOptions::ComplexRangeKind::CX_Full;
+      ComplexRangeStr = RenderComplexRangeOption("full");
       break;
     case options::OPT_fcx_fortran_rules: {
       EmitComplexRangeDiag(D, Range, LangOptions::ComplexRangeKind::CX_Fortran);
       Range = LangOptions::ComplexRangeKind::CX_Fortran;
-      std::string ComplexRangeStr = RenderComplexRangeOption("fortran");
-      if (!ComplexRangeStr.empty())
-        CmdArgs.push_back(Args.MakeArgString(ComplexRangeStr));
+      ComplexRangeStr = RenderComplexRangeOption("fortran");
       break;
     }
     case options::OPT_fno_cx_fortran_rules:
+      EmitComplexRangeDiag(D, Range, LangOptions::ComplexRangeKind::CX_Full);
       Range = LangOptions::ComplexRangeKind::CX_Full;
+      ComplexRangeStr = RenderComplexRangeOption("full");
       break;
     case options::OPT_ffp_model_EQ: {
       // If -ffp-model= is seen, reset to fno-fast-math
@@ -3056,9 +3057,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
       SeenUnsafeMathModeOption = true;
       // ffast-math enables fortran rules for complex multiplication and
       // division.
-      std::string ComplexRangeStr = RenderComplexRangeOption("limited");
-      if (!ComplexRangeStr.empty())
-        CmdArgs.push_back(Args.MakeArgString(ComplexRangeStr));
+      ComplexRangeStr = RenderComplexRangeOption("limited");
       break;
     }
     case options::OPT_fno_fast_math:
@@ -3215,6 +3214,8 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
                    options::OPT_fstrict_float_cast_overflow, false))
     CmdArgs.push_back("-fno-strict-float-cast-overflow");
 
+  if (!ComplexRangeStr.empty())
+    CmdArgs.push_back(Args.MakeArgString(ComplexRangeStr));
   if (Args.hasArg(options::OPT_fcx_limited_range))
     CmdArgs.push_back("-fcx-limited-range");
   if (Args.hasArg(options::OPT_fcx_fortran_rules))
diff --git a/clang/test/CodeGen/cx-complex-range.c b/clang/test/CodeGen/cx-complex-range.c
index 8368fa611335cca..2d8507c710f2021 100644
--- a/clang/test/CodeGen/cx-complex-range.c
+++ b/clang/test/CodeGen/cx-complex-range.c
@@ -15,9 +15,25 @@
 // RUN: -ffast-math -complex-range=limited -emit-llvm -o - %s \
 // RUN: | FileCheck %s --check-prefix=LMTD-FAST
 
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu \
+// RUN: -ffast-math -complex-range=full -emit-llvm -o - %s \
+// RUN: | FileCheck %s --check-prefix=FULL
+
 // RUN: %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown \
 // RUN: -fno-cx-fortran-rules -o - | FileCheck %s --check-prefix=FULL
 
+// RUN: %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown \
+// RUN: -fcx-limited-range -fno-cx-limited-range -o - \
+// RUN: | FileCheck %s --check-prefix=FULL
+
+// RUN: %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown \
+// RUN: -fno-cx-limited-range -fcx-limited-range -o - \
+// RUN: | FileCheck %s --check-prefix=FULL
+
+// RUN: %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown \
+// RUN: -fno-cx-fortran-rules -fcx-fortran-rules -o - \
+// RUN: | FileCheck %s --check-prefix=FULL
+
 _Complex float div(_Complex float a, _Complex float b) {
   // LABEL: define {{.*}} @div(
   // FULL:  call {{.*}} @__divsc3
diff --git a/clang/test/Driver/range.c b/clang/test/Driver/range.c
index 8d456a997d6967e..045d9c7d3d802ae 100644
--- a/clang/test/Driver/range.c
+++ b/clang/test/Driver/range.c
@@ -6,6 +6,9 @@
 // RUN: %clang -### -target x86_64 -fno-cx-limited-range -c %s 2>&1 \
 // RUN:   | FileCheck %s
 
+// RUN: %clang -### -target x86_64 -fcx-limited-range -fno-cx-limited-range \
+// RUN: -c %s 2>&1 | FileCheck --check-prefix=FULL %s
+
 // RUN: %clang -### -target x86_64 -fcx-fortran-rules -c %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=FRTRN %s
 
@@ -29,7 +32,11 @@
 // RUN: %clang -### -target x86_64 -fcx-limited-range -ffast-math -c %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=LMTD %s
 
+// RUN: %clang -### -target x86_64 -ffast-math -fno-cx-limited-range -c %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=FULL %s
+
 // LMTD: -complex-range=limited
+// FULL: -complex-range=full
 // LMTD-NOT: -complex-range=fortran
 // CHECK-NOT: -complex-range=limited
 // FRTRN: -complex-range=fortran

>From 989659aabd773abea9d0061e74ed2341d272548f Mon Sep 17 00:00:00 2001
From: Ammarguellat <zahira.ammarguellat at intel.com>
Date: Wed, 17 Jan 2024 05:05:51 -0800
Subject: [PATCH 2/4] Testing.

---
 clang/test/CodeGen/test.c | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 clang/test/CodeGen/test.c

diff --git a/clang/test/CodeGen/test.c b/clang/test/CodeGen/test.c
new file mode 100644
index 000000000000000..1a4baf536d705b9
--- /dev/null
+++ b/clang/test/CodeGen/test.c
@@ -0,0 +1 @@
+  

>From aefa66113b2dce1babd8e87c0c64de0dd0503991 Mon Sep 17 00:00:00 2001
From: Ammarguellat <zahira.ammarguellat at intel.com>
Date: Wed, 17 Jan 2024 05:06:59 -0800
Subject: [PATCH 3/4] Deleted test.c added by mistake.

---
 clang/test/CodeGen/test.c | 1 -
 1 file changed, 1 deletion(-)
 delete mode 100644 clang/test/CodeGen/test.c

diff --git a/clang/test/CodeGen/test.c b/clang/test/CodeGen/test.c
deleted file mode 100644
index 1a4baf536d705b9..000000000000000
--- a/clang/test/CodeGen/test.c
+++ /dev/null
@@ -1 +0,0 @@
-  

>From f6918d4223370f6dd038cac8c1d12224afa46eb4 Mon Sep 17 00:00:00 2001
From: Ammarguellat <zahira.ammarguellat at intel.com>
Date: Thu, 18 Jan 2024 07:44:18 -0800
Subject: [PATCH 4/4] Addressed review comments.

---
 clang/include/clang/Basic/LangOptions.def |  2 +-
 clang/include/clang/Basic/LangOptions.h   |  2 +-
 clang/lib/CodeGen/CGExprComplex.cpp       |  3 +-
 clang/lib/Driver/ToolChains/Clang.cpp     | 27 ++++++++---
 clang/test/CodeGen/smiths-complex-div.c   | 59 +++++++++++++++++++++++
 5 files changed, 81 insertions(+), 12 deletions(-)
 create mode 100644 clang/test/CodeGen/smiths-complex-div.c

diff --git a/clang/include/clang/Basic/LangOptions.def b/clang/include/clang/Basic/LangOptions.def
index 0428b70c602062e..0564a012abe632a 100644
--- a/clang/include/clang/Basic/LangOptions.def
+++ b/clang/include/clang/Basic/LangOptions.def
@@ -220,7 +220,7 @@ 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")
 
-ENUM_LANGOPT(ComplexRange, ComplexRangeKind, 2, CX_Full, "Enable use of range reduction for complex arithmetics.")
+ENUM_LANGOPT(ComplexRange, ComplexRangeKind, 2, CX_None, "Enable use of range reduction for complex arithmetics.")
 
 BENIGN_LANGOPT(ObjCGCBitmapPrint , 1, 0, "printing of GC's bitmap layout for __weak/__strong ivars")
 
diff --git a/clang/include/clang/Basic/LangOptions.h b/clang/include/clang/Basic/LangOptions.h
index 9f986fce2d44188..4d59bcd44cef381 100644
--- a/clang/include/clang/Basic/LangOptions.h
+++ b/clang/include/clang/Basic/LangOptions.h
@@ -392,7 +392,7 @@ class LangOptions : public LangOptionsBase {
     IncompleteOnly = 3,
   };
 
-  enum ComplexRangeKind { CX_Full, CX_Limited, CX_Fortran };
+  enum ComplexRangeKind { CX_Full, CX_Limited, CX_Fortran, CX_None };
 
 public:
   /// The used language standard.
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index 6fbd8f19eeb50a4..804eb8c9c6542fb 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -981,8 +981,7 @@ ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
     else if (!CGF.getLangOpts().FastMath ||
              // '-ffast-math' is used in the command line but followed by an
              // '-fno-cx-limited-range'.
-             (CGF.getLangOpts().FastMath &&
-              Op.FPFeatures.getComplexRange() == LangOptions::CX_Full)) {
+             Op.FPFeatures.getComplexRange() == LangOptions::CX_Full) {
       LHSi = OrigLHSi;
       // 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
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 7e25347677e23e8..b6d3345e2567864 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2712,9 +2712,22 @@ static void EmitComplexRangeDiag(const Driver &D,
         << EnumComplexRangeToStr(Range1) << EnumComplexRangeToStr(Range2);
 }
 
-static std::string RenderComplexRangeOption(std::string Range) {
+static std::string
+RenderComplexRangeOption(LangOptions::ComplexRangeKind Range) {
   std::string ComplexRangeStr = "-complex-range=";
-  ComplexRangeStr += Range;
+  switch (Range) {
+  case LangOptions::ComplexRangeKind::CX_Full:
+    ComplexRangeStr += "full";
+    break;
+  case LangOptions::ComplexRangeKind::CX_Limited:
+    ComplexRangeStr += "limited";
+    break;
+  case LangOptions::ComplexRangeKind::CX_Fortran:
+    ComplexRangeStr += "fortran";
+    break;
+  case LangOptions::ComplexRangeKind::CX_None:
+    ComplexRangeStr = "";
+  }
   return ComplexRangeStr;
 }
 
@@ -2764,7 +2777,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
   bool StrictFPModel = false;
   StringRef Float16ExcessPrecision = "";
   StringRef BFloat16ExcessPrecision = "";
-  LangOptions::ComplexRangeKind Range = LangOptions::ComplexRangeKind::CX_Full;
+  LangOptions::ComplexRangeKind Range = LangOptions::ComplexRangeKind::CX_None;
   std::string ComplexRangeStr = "";
 
   if (const Arg *A = Args.getLastArg(options::OPT_flimited_precision_EQ)) {
@@ -2781,24 +2794,20 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
     case options::OPT_fcx_limited_range: {
       EmitComplexRangeDiag(D, Range, LangOptions::ComplexRangeKind::CX_Limited);
       Range = LangOptions::ComplexRangeKind::CX_Limited;
-      ComplexRangeStr = RenderComplexRangeOption("limited");
       break;
     }
     case options::OPT_fno_cx_limited_range:
       EmitComplexRangeDiag(D, Range, LangOptions::ComplexRangeKind::CX_Full);
       Range = LangOptions::ComplexRangeKind::CX_Full;
-      ComplexRangeStr = RenderComplexRangeOption("full");
       break;
     case options::OPT_fcx_fortran_rules: {
       EmitComplexRangeDiag(D, Range, LangOptions::ComplexRangeKind::CX_Fortran);
       Range = LangOptions::ComplexRangeKind::CX_Fortran;
-      ComplexRangeStr = RenderComplexRangeOption("fortran");
       break;
     }
     case options::OPT_fno_cx_fortran_rules:
       EmitComplexRangeDiag(D, Range, LangOptions::ComplexRangeKind::CX_Full);
       Range = LangOptions::ComplexRangeKind::CX_Full;
-      ComplexRangeStr = RenderComplexRangeOption("full");
       break;
     case options::OPT_ffp_model_EQ: {
       // If -ffp-model= is seen, reset to fno-fast-math
@@ -3069,7 +3078,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
       SeenUnsafeMathModeOption = true;
       // ffast-math enables fortran rules for complex multiplication and
       // division.
-      ComplexRangeStr = RenderComplexRangeOption("limited");
+      Range = LangOptions::ComplexRangeKind::CX_Limited;
       break;
     }
     case options::OPT_fno_fast_math:
@@ -3226,6 +3235,8 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
                    options::OPT_fstrict_float_cast_overflow, false))
     CmdArgs.push_back("-fno-strict-float-cast-overflow");
 
+  if (Range != LangOptions::ComplexRangeKind::CX_None)
+    ComplexRangeStr = RenderComplexRangeOption(Range);
   if (!ComplexRangeStr.empty())
     CmdArgs.push_back(Args.MakeArgString(ComplexRangeStr));
   if (Args.hasArg(options::OPT_fcx_limited_range))
diff --git a/clang/test/CodeGen/smiths-complex-div.c b/clang/test/CodeGen/smiths-complex-div.c
new file mode 100644
index 000000000000000..75775675c923811
--- /dev/null
+++ b/clang/test/CodeGen/smiths-complex-div.c
@@ -0,0 +1,59 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 4
+// RUN: %clang_cc1 %s -O0 -emit-llvm -triple x86_64-unknown-unknown \
+// RUN: -complex-range=fortran -o - | FileCheck %s --check-prefix=FRTRN
+
+// FRTRN-LABEL: define dso_local <2 x float> @div(
+// FRTRN-SAME: <2 x float> noundef [[A_COERCE:%.*]], <2 x float> noundef [[B_COERCE:%.*]]) #[[ATTR0:[0-9]+]] {
+// FRTRN-NEXT:  entry:
+// FRTRN-NEXT:    [[RETVAL:%.*]] = alloca { float, float }, align 4
+// FRTRN-NEXT:    [[A:%.*]] = alloca { float, float }, align 4
+// FRTRN-NEXT:    [[B:%.*]] = alloca { float, float }, align 4
+// FRTRN-NEXT:    store <2 x float> [[A_COERCE]], ptr [[A]], align 4
+// FRTRN-NEXT:    store <2 x float> [[B_COERCE]], ptr [[B]], align 4
+// FRTRN-NEXT:    [[A_REALP:%.*]] = getelementptr inbounds { float, float }, ptr [[A]], i32 0, i32 0
+// FRTRN-NEXT:    [[A_REAL:%.*]] = load float, ptr [[A_REALP]], align 4
+// FRTRN-NEXT:    [[A_IMAGP:%.*]] = getelementptr inbounds { float, float }, ptr [[A]], i32 0, i32 1
+// FRTRN-NEXT:    [[A_IMAG:%.*]] = load float, ptr [[A_IMAGP]], align 4
+// FRTRN-NEXT:    [[B_REALP:%.*]] = getelementptr inbounds { float, float }, ptr [[B]], i32 0, i32 0
+// FRTRN-NEXT:    [[B_REAL:%.*]] = load float, ptr [[B_REALP]], align 4
+// FRTRN-NEXT:    [[B_IMAGP:%.*]] = getelementptr inbounds { float, float }, ptr [[B]], i32 0, i32 1
+// FRTRN-NEXT:    [[B_IMAG:%.*]] = load float, ptr [[B_IMAGP]], align 4
+// FRTRN-NEXT:    [[TMP0:%.*]] = call float @llvm.fabs.f32(float [[B_REAL]])
+// FRTRN-NEXT:    [[TMP1:%.*]] = call float @llvm.fabs.f32(float [[B_IMAG]])
+// FRTRN-NEXT:    [[ABS_CMP:%.*]] = fcmp ugt float [[TMP0]], [[TMP1]]
+// FRTRN-NEXT:    br i1 [[ABS_CMP]], label [[ABS_RHSR_GREATER_OR_EQUAL_ABS_RHSI:%.*]], label [[ABS_RHSR_LESS_THAN_ABS_RHSI:%.*]]
+// FRTRN:       abs_rhsr_greater_or_equal_abs_rhsi:
+// FRTRN-NEXT:    [[TMP2:%.*]] = fdiv float [[B_IMAG]], [[B_REAL]]
+// FRTRN-NEXT:    [[TMP3:%.*]] = fmul float [[TMP2]], [[B_IMAG]]
+// FRTRN-NEXT:    [[TMP4:%.*]] = fadd float [[B_REAL]], [[TMP3]]
+// FRTRN-NEXT:    [[TMP5:%.*]] = fmul float [[A_IMAG]], [[TMP2]]
+// FRTRN-NEXT:    [[TMP6:%.*]] = fadd float [[A_REAL]], [[TMP5]]
+// FRTRN-NEXT:    [[TMP7:%.*]] = fdiv float [[TMP6]], [[TMP4]]
+// FRTRN-NEXT:    [[TMP8:%.*]] = fmul float [[A_REAL]], [[TMP2]]
+// FRTRN-NEXT:    [[TMP9:%.*]] = fsub float [[A_IMAG]], [[TMP8]]
+// FRTRN-NEXT:    [[TMP10:%.*]] = fdiv float [[TMP9]], [[TMP4]]
+// FRTRN-NEXT:    br label [[COMPLEX_DIV:%.*]]
+// FRTRN:       abs_rhsr_less_than_abs_rhsi:
+// FRTRN-NEXT:    [[TMP11:%.*]] = fdiv float [[B_REAL]], [[B_IMAG]]
+// FRTRN-NEXT:    [[TMP12:%.*]] = fmul float [[TMP11]], [[B_REAL]]
+// FRTRN-NEXT:    [[TMP13:%.*]] = fadd float [[B_IMAG]], [[TMP12]]
+// FRTRN-NEXT:    [[TMP14:%.*]] = fmul float [[A_REAL]], [[TMP11]]
+// FRTRN-NEXT:    [[TMP15:%.*]] = fadd float [[TMP14]], [[A_IMAG]]
+// FRTRN-NEXT:    [[TMP16:%.*]] = fdiv float [[TMP15]], [[TMP13]]
+// FRTRN-NEXT:    [[TMP17:%.*]] = fmul float [[A_IMAG]], [[TMP11]]
+// FRTRN-NEXT:    [[TMP18:%.*]] = fsub float [[TMP17]], [[A_REAL]]
+// FRTRN-NEXT:    [[TMP19:%.*]] = fdiv float [[TMP18]], [[TMP13]]
+// FRTRN-NEXT:    br label [[COMPLEX_DIV]]
+// FRTRN:       complex_div:
+// FRTRN-NEXT:    [[TMP20:%.*]] = phi float [ [[TMP7]], [[ABS_RHSR_GREATER_OR_EQUAL_ABS_RHSI]] ], [ [[TMP16]], [[ABS_RHSR_LESS_THAN_ABS_RHSI]] ]
+// FRTRN-NEXT:    [[TMP21:%.*]] = phi float [ [[TMP10]], [[ABS_RHSR_GREATER_OR_EQUAL_ABS_RHSI]] ], [ [[TMP19]], [[ABS_RHSR_LESS_THAN_ABS_RHSI]] ]
+// FRTRN-NEXT:    [[RETVAL_REALP:%.*]] = getelementptr inbounds { float, float }, ptr [[RETVAL]], i32 0, i32 0
+// FRTRN-NEXT:    [[RETVAL_IMAGP:%.*]] = getelementptr inbounds { float, float }, ptr [[RETVAL]], i32 0, i32 1
+// FRTRN-NEXT:    store float [[TMP20]], ptr [[RETVAL_REALP]], align 4
+// FRTRN-NEXT:    store float [[TMP21]], ptr [[RETVAL_IMAGP]], align 4
+// FRTRN-NEXT:    [[TMP22:%.*]] = load <2 x float>, ptr [[RETVAL]], align 4
+// FRTRN-NEXT:    ret <2 x float> [[TMP22]]
+//
+_Complex float div(_Complex float a, _Complex float b) {
+  return a / b;
+}



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