allow AMDGPU to store doubles to register

Author: jameshu15869

libc/benchmarks/gpu/timing/amdgpu/timing.h

@@ -67,7 +67,9 @@ template <typename F, typename T>
 
   // This inline assembly performs a no-op which forces the result to both
   // be used and prevents us from exiting this region before it's complete.
-  asm("v_or_b32 %[v_reg], 0, %[v_reg]\n" ::[v_reg] "v"(result) :);
+  asm("v_or_b32 %[v_reg], 0, %[v_reg]\n" ::[v_reg] "v"(
+          static_cast<uint32_t>(result))
+      :);
 
   // Obtain the current timestamp after running the calculation and force
   // ordering.
@@ -98,7 +100,9 @@ template <typename F, typename T1, typename T2>
 
   auto result = f(arg1, arg2);
 
-  asm("v_or_b32 %[v_reg], 0, %[v_reg]\n" ::[v_reg] "v"(result) :);
+  asm("v_or_b32 %[v_reg], 0, %[v_reg]\n" ::[v_reg] "v"(
+          static_cast<uint32_t>(result))
+      :);
 
   uint64_t stop = gpu::processor_clock();
   asm("" ::"s"(stop));