port libc instead, nothing much discovered

Author: JonChesterfield

clang/lib/Basic/Targets/SPIR.h

@@ -399,6 +399,8 @@ class LLVM_LIBRARY_VISIBILITY SPIRV64AMDGCNTargetInfo final
     HasLegalHalfType = true;
     HasFloat16 = true;
     HalfArgsAndReturns = true;
+
+    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
   }
 
   bool hasBFloat16Type() const override { return true; }

libc/cmake/modules/LLVMLibCArchitectures.cmake

@@ -49,6 +49,8 @@ function(get_arch_and_system_from_triple triple arch_var sys_var)
     set(target_arch "riscv32")
   elseif(target_arch MATCHES "^riscv64")
     set(target_arch "riscv64")
+  elseif(target_arch MATCHES "^spirv64")
+    set(target_arch "spirv64")
   elseif(target_arch MATCHES "^amdgcn")
     set(target_arch "amdgpu")
   elseif(target_arch MATCHES "^nvptx64")
@@ -160,6 +162,8 @@ elseif(LIBC_TARGET_ARCHITECTURE STREQUAL "riscv32")
   set(LIBC_TARGET_ARCHITECTURE "riscv")
 elseif(LIBC_TARGET_ARCHITECTURE STREQUAL "amdgpu")
   set(LIBC_TARGET_ARCHITECTURE_IS_AMDGPU TRUE)
+elseif(LIBC_TARGET_ARCHITECTURE STREQUAL "spirv64")
+  set(LIBC_TARGET_ARCHITECTURE_IS_SPIRV64 TRUE)
 elseif(LIBC_TARGET_ARCHITECTURE STREQUAL "nvptx")
   set(LIBC_TARGET_ARCHITECTURE_IS_NVPTX TRUE)
 else()

libc/config/gpu/spirv64/config.json

@@ -0,0 +1,37 @@
+{
+  "errno": {
+    "LIBC_CONF_ERRNO_MODE": {
+      "value": "LIBC_ERRNO_MODE_SHARED"
+    }
+  },
+  "printf": {
+    "LIBC_CONF_PRINTF_DISABLE_FLOAT": {
+      "value": true
+    },
+    "LIBC_CONF_PRINTF_DISABLE_INDEX_MODE": {
+      "value": true
+    },
+    "LIBC_CONF_PRINTF_DISABLE_WRITE_INT": {
+      "value": true
+    },
+    "LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE": {
+      "value": false
+    },
+    "LIBC_CONF_PRINTF_DISABLE_STRERROR": {
+      "value": true
+    }
+  },
+  "scanf": {
+    "LIBC_CONF_SCANF_DISABLE_FLOAT": {
+      "value": true
+    },
+    "LIBC_CONF_SCANF_DISABLE_INDEX_MODE": {
+      "value": true
+    }
+  },
+  "math": {
+    "LIBC_CONF_MATH_OPTIMIZATIONS": {
+      "value": "(LIBC_MATH_SKIP_ACCURATE_PASS | LIBC_MATH_SMALL_TABLES | LIBC_MATH_NO_ERRNO | LIBC_MATH_NO_EXCEPT)"
+    }
+  }
+}