specs: Set max-atomic-width to 16

taiki-e · Rahix · commit b631bab564b2 · 2024-09-15T02:27:43.000+02:00
diff --git a/avr-specs/avr-atmega1280.json b/avr-specs/avr-atmega1280.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega1284p.json b/avr-specs/avr-atmega1284p.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega128a.json b/avr-specs/avr-atmega128a.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega164pa.json b/avr-specs/avr-atmega164pa.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega168.json b/avr-specs/avr-atmega168.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega2560.json b/avr-specs/avr-atmega2560.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega328.json b/avr-specs/avr-atmega328.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega328p.json b/avr-specs/avr-atmega328p.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega32a.json b/avr-specs/avr-atmega32a.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega32u4.json b/avr-specs/avr-atmega32u4.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega48p.json b/avr-specs/avr-atmega48p.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-atmega8.json b/avr-specs/avr-atmega8.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-attiny167.json b/avr-specs/avr-attiny167.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-attiny2313.json b/avr-specs/avr-attiny2313.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-attiny85.json b/avr-specs/avr-attiny85.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/avr-attiny88.json b/avr-specs/avr-attiny88.json
@@ -17,7 +17,7 @@
   "linker": "avr-gcc",
   "linker-flavor": "gnu-cc",
   "llvm-target": "avr-unknown-unknown",
-  "max-atomic-width": 8,
+  "max-atomic-width": 16,
   "metadata": {
     "description": null,
     "host_tools": null,
diff --git a/avr-specs/sync-from-upstream.py b/avr-specs/sync-from-upstream.py
@@ -58,7 +58,9 @@
     # needed because we currently rely on avr-libc
     "no-default-libraries": False,
     # 8-bit operations on AVR are atomic
-    "max-atomic-width": 8,
+    # LLVM also supports 16-bit atomics by disabling interrupts
+    # see also https://github.com/rust-lang/rust/pull/114495
+    "max-atomic-width": 16,
 }
 
 
