FindCUDA/select_compute_arch: Add CUDA 11 and Ampere support

Co-Author: Henry Schreiner <henryschreineriii@gmail.com>

Modules/FindCUDA/select_compute_arch.cmake

@@ -5,9 +5,9 @@
 #       - "Auto" detects local machine GPU compute arch at runtime.
 #       - "Common" and "All" cover common and entire subsets of architectures
 #      ARCH_AND_PTX : NAME | NUM.NUM | NUM.NUM(NUM.NUM) | NUM.NUM+PTX
-#      NAME: Fermi Kepler Maxwell Kepler+Tegra Kepler+Tesla Maxwell+Tegra Pascal Volta Turing
+#      NAME: Fermi Kepler Maxwell Kepler+Tegra Kepler+Tesla Maxwell+Tegra Pascal Volta Turing Ampere
 #      NUM: Any number. Only those pairs are currently accepted by NVCC though:
-#            2.0 2.1 3.0 3.2 3.5 3.7 5.0 5.2 5.3 6.0 6.2 7.0 7.2 7.5
+#            2.0 2.1 3.0 3.2 3.5 3.7 5.0 5.2 5.3 6.0 6.2 7.0 7.2 7.5 8.0
 #      Returns LIST of flags to be added to CUDA_NVCC_FLAGS in ${out_variable}
 #      Additionally, sets ${out_variable}_readable to the resulting numeric list
 #      Example:
@@ -30,7 +30,12 @@ endif()
 set(CUDA_KNOWN_GPU_ARCHITECTURES  "Fermi" "Kepler" "Maxwell")
 
 # This list will be used for CUDA_ARCH_NAME = Common option (enabled by default)
-set(CUDA_COMMON_GPU_ARCHITECTURES "3.0" "3.5" "5.0")
+set(CUDA_COMMON_GPU_ARCHITECTURES "3.5" "5.0")
+# 3.0 is removed in CUDA 11, see:
+# https://docs.nvidia.com/cuda/cuda-toolkit-release-notes/index.html#deprecated-features
+if(CUDA_VERSION VERSION_LESS "11.0")
+  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "3.0")
+endif()
 
 if(CUDA_VERSION VERSION_LESS "7.0")
   set(CUDA_LIMIT_GPU_ARCHITECTURE "5.2")
@@ -62,20 +67,32 @@ endif ()
 
 if(CUDA_VERSION VERSION_GREATER_EQUAL "9.0")
   list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Volta")
-  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "7.0" "7.0+PTX")
-  list(APPEND CUDA_ALL_GPU_ARCHITECTURES "7.0" "7.0+PTX" "7.2" "7.2+PTX")
+  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "7.0")
+  list(APPEND CUDA_ALL_GPU_ARCHITECTURES "7.0" "7.2")
 
   if(CUDA_VERSION VERSION_LESS "10.0")
+    list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "7.0+PTX")
     set(CUDA_LIMIT_GPU_ARCHITECTURE "8.0")
   endif()
 endif()
 
 if(CUDA_VERSION VERSION_GREATER_EQUAL "10.0")
   list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Turing")
-  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "7.5" "7.5+PTX")
-  list(APPEND CUDA_ALL_GPU_ARCHITECTURES "7.5" "7.5+PTX")
+  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "7.5")
+  list(APPEND CUDA_ALL_GPU_ARCHITECTURES "7.5")
 
   if(CUDA_VERSION VERSION_LESS "11.0")
+    set(CUDA_LIMIT_GPU_ARCHITECTURE "8.0")
+    list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "7.5+PTX")
+  endif()
+endif()
+
+if(CUDA_VERSION VERSION_GREATER_EQUAL "11.0")
+  list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Ampere")
+  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "8.0" "8.0+PTX")
+  list(APPEND CUDA_ALL_GPU_ARCHITECTURES "8.0")
+
+  if(CUDA_VERSION VERSION_LESS "12.0")
     set(CUDA_LIMIT_GPU_ARCHITECTURE "9.0")
   endif()
 endif()
@@ -214,6 +231,9 @@ function(CUDA_SELECT_NVCC_ARCH_FLAGS out_variable)
       elseif(${arch_name} STREQUAL "Turing")
         set(arch_bin 7.5)
         set(arch_ptx 7.5)
+      elseif(${arch_name} STREQUAL "Ampere")
+        set(arch_bin 8.0)
+        set(arch_ptx 8.0)
       else()
         message(SEND_ERROR "Unknown CUDA Architecture Name ${arch_name} in CUDA_SELECT_NVCC_ARCH_FLAGS")
       endif()