[NVPTX] Read __CUDA_FTZ from module flags in NVVMReflect.

Summary:
Previously the NVVMReflect pass would read its configuration from
command-line flags or a static configuration given to the pass at
instantiation time.

This doesn't quite work for clang's use-case.  It needs to pass a value
for __CUDA_FTZ down on a per-module basis.  We use a module flag for
this, so the NVVMReflect pass needs to be updated to read said flag.

Reviewers: tra, rnk

Subscribers: cfe-commits, jholewinski

Differential Revision: http://reviews.llvm.org/D18672

llvm-svn: 265090

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/NVPTX/nvvm-reflect-module-flag.ll b/llvm/test/CodeGen/NVPTX/nvvm-reflect-module-flag.ll
new file mode 100644
index 00000000000..4fdab5c087d
--- /dev/null
+++ b/llvm/test/CodeGen/NVPTX/nvvm-reflect-module-flag.ll
@@ -0,0 +1,13 @@
+; RUN: opt < %s -S -nvvm-reflect | FileCheck %s
+
+declare i32 @__nvvm_reflect(i8*)
+@str = private unnamed_addr addrspace(1) constant [11 x i8] c"__CUDA_FTZ\00"
+
+define i32 @foo() {
+  %call = call i32 @__nvvm_reflect(i8* addrspacecast (i8 addrspace(1)* getelementptr inbounds ([11 x i8], [11 x i8] addrspace(1)* @str, i32 0, i32 0) to i8*))
+  ; CHECK: ret i32 42
+  ret i32 %call
+}
+
+!llvm.module.flags = !{!0}
+!0 = !{i32 4, !"nvvm-reflect-ftz", i32 42}