[OpenCL][AMDGPU] Add support for -cl-denorms-are-zero

Adjust target features for amdgcn target when -cl-denorms-are-zero is set.

Denormal support is controlled by feature strings fp32-denormals fp64-denormals in amdgcn target. If -cl-denorms-are-zero is not set and the command line does not set fp32/64-denormals feature string, +fp32-denormals +fp64-denormals will be on for GPU's supporting them.

A new virtual function virtual void TargetInfo::adjustTargetOptions(const CodeGenOptions &CGOpts, TargetOptions &TargetOpts) const is introduced to allow adjusting target option by codegen option.

Differential Revision: https://reviews.llvm.org/D22815

llvm-svn: 278151

1 files changed, 9 insertions, 1 deletions

diff --git a/clang/test/CodeGenOpenCL/denorms-are-zero.cl b/clang/test/CodeGenOpenCL/denorms-are-zero.cl
index 488004fa4fc..42627303afa 100644
--- a/clang/test/CodeGenOpenCL/denorms-are-zero.cl
+++ b/clang/test/CodeGenOpenCL/denorms-are-zero.cl
@@ -1,5 +1,13 @@
 // RUN: %clang_cc1 -S -cl-denorms-are-zero -o - %s 2>&1
+// RUN: %clang_cc1 -emit-llvm -cl-denorms-are-zero -o - -triple amdgcn--amdhsa -target-cpu fiji %s | FileCheck %s
+// RUN: %clang_cc1 -emit-llvm -o - -triple amdgcn--amdhsa -target-cpu fiji %s | FileCheck %s --check-prefix=CHECK-DENORM
 
-// This test just checks that the -cl-denorms-are-zero argument is accepted
+// For non-amdgcn targets, this test just checks that the -cl-denorms-are-zero argument is accepted
 // by clang.  This option is currently a no-op, which is allowed by the
 // OpenCL specification.
+
+// CHECK-DENORM-LABEL: define void @f()
+// CHECK-DENORM: attributes #{{[0-9]*}} = {{{[^}]*}} "target-features"="{{[^"]*}}+fp32-denormals,+fp64-denormals{{[^"]*}}"
+// CHECK-LABEL: define void @f()
+// CHECK-NOT: attributes #{{[0-9]*}} = {{{[^}]*}} "target-features"="{{[^"]*}}+fp32-denormals,+fp64-denormals{{[^"]*}}"
+void f() {}