//
//===----------------------------------------------------------------------===//
//
-// This pass replaces occurrences of __nvvm_reflect("string") and
-// llvm.nvvm.reflect with an integer based on the value of -nvvm-reflect-list
-// string=<int>.
+// This pass replaces occurrences of __nvvm_reflect("foo") and llvm.nvvm.reflect
+// with an integer.
//
-// If we see a string not specified in our flags, we replace that call with 0.
+// We choose the value we use by looking, in this order, at:
+//
+// * the -nvvm-reflect-list flag, which has the format "foo=1,bar=42",
+// * the StringMap passed to the pass's constructor, and
+// * metadata in the module itself.
+//
+// If we see an unknown string, we replace its call with 0.
//
//===----------------------------------------------------------------------===//
static char ID;
NVVMReflect() : NVVMReflect(StringMap<int>()) {}
- NVVMReflect(const StringMap<int> &Mapping) : FunctionPass(ID) {
+ NVVMReflect(const StringMap<int> &Mapping)
+ : FunctionPass(ID), VarMap(Mapping) {
initializeNVVMReflectPass(*PassRegistry::getPassRegistry());
- for (const auto &KV : Mapping)
- VarMap[KV.getKey()] = KV.getValue();
setVarMap();
}
auto Iter = VarMap.find(ReflectArg);
if (Iter != VarMap.end())
ReflectVal = Iter->second;
+ else if (ReflectArg == "__CUDA_FTZ") {
+ // Try to pull __CUDA_FTZ from the nvvm-reflect-ftz module flag.
+ if (auto *Flag = mdconst::extract_or_null<ConstantInt>(
+ F.getParent()->getModuleFlag("nvvm-reflect-ftz")))
+ ReflectVal = Flag->getSExtValue();
+ }
Call->replaceAllUsesWith(ConstantInt::get(Call->getType(), ReflectVal));
ToRemove.push_back(Call);
}
--- /dev/null
+; 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}