Do not copy long double and 128-bit fp format from aux target for AMDGPU

rC352620 caused regressions because it copied floating point format from
aux target.

floating point format decides whether extended long double is supported.
It is x86_fp80 on x86 but IEEE double on amdgcn.

Document usage of long doubel type in HIP programming guide
https://github.com/ROCm-Developer-Tools/HIP/pull/890

Differential Revision: https://reviews.llvm.org/D57527

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@352801 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Basic/Targets/AMDGPU.cpp b/lib/Basic/Targets/AMDGPU.cpp
index 19dc05f5b0a255abc77d7e91e53cee3c4f4402b7..b04d894855eaa3f4f63a0a108f3095f7d0287b83 100644 (file)
--- a/lib/Basic/Targets/AMDGPU.cpp
+++ b/lib/Basic/Targets/AMDGPU.cpp
@@ -307,5 +307,16 @@ void AMDGPUTargetInfo::getTargetDefines(const LangOptions &Opts,
 }
 
 void AMDGPUTargetInfo::setAuxTarget(const TargetInfo *Aux) {
+  assert(HalfFormat == Aux->HalfFormat);
+  assert(FloatFormat == Aux->FloatFormat);
+  assert(DoubleFormat == Aux->DoubleFormat);
+
+  // On x86_64 long double is 80-bit extended precision format, which is
+  // not supported by AMDGPU. 128-bit floating point format is also not
+  // supported by AMDGPU. Therefore keep its own format for these two types.
+  auto SaveLongDoubleFormat = LongDoubleFormat;
+  auto SaveFloat128Format = Float128Format;
   copyAuxTarget(Aux);
+  LongDoubleFormat = SaveLongDoubleFormat;
+  Float128Format = SaveFloat128Format;
 }

diff --git a/test/CodeGenCUDA/types.cu b/test/CodeGenCUDA/types.cu
new file mode 100644 (file)
index 0000000..43c2b85
--- /dev/null
+++ b/test/CodeGenCUDA/types.cu
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -triple amdgcn -aux-triple x86_64 -fcuda-is-device -emit-llvm %s -o - | FileCheck -check-prefix=DEV %s
+// RUN: %clang_cc1 -triple x86_64 -aux-triple amdgcn -emit-llvm %s -o - | FileCheck -check-prefix=HOST %s
+
+#include "Inputs/cuda.h"
+
+// HOST: @ld_host = global x86_fp80 0xK00000000000000000000
+long double ld_host;
+
+// DEV: @ld_device = addrspace(1) externally_initialized global double 0.000000e+00
+__device__ long double ld_device;