wasm(32|64): update alignment string

See llvm/llvm-project@c5ab70c

@rustbot label: +llvm-main

Author: durin42

compiler/rustc_codegen_llvm/src/context.rs

@@ -164,6 +164,11 @@ pub(crate) unsafe fn create_module<'ll>(
             // See https://github.com/llvm/llvm-project/pull/118004
             target_data_layout = target_data_layout.replace("-i128:128", "");
         }
+        if sess.target.arch.starts_with("wasm32") || sess.target.arch.starts_with("wasm64") {
+            // LLVM 20 updates the wasm(32|64) layout to correctly align 128 bit integers to 128 bit.
+            // See https://github.com/llvm/llvm-project/pull/119204
+            target_data_layout = target_data_layout.replace("-i128:128", "");
+        }
     }
 
     // Ensure the data-layout values hardcoded remain the defaults.

compiler/rustc_target/src/spec/targets/wasm32_unknown_emscripten.rs

@@ -32,7 +32,8 @@ pub(crate) fn target() -> Target {
             std: Some(true),
         },
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-f128:64-n32:64-S128-ni:1:10:20".into(),
+        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-f128:64-n32:64-S128-ni:1:10:20"
+            .into(),
         arch: "wasm32".into(),
         options: opts,
     }

compiler/rustc_target/src/spec/targets/wasm32_unknown_unknown.rs

@@ -37,7 +37,7 @@ pub(crate) fn target() -> Target {
             std: Some(true),
         },
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
+        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20".into(),
         arch: "wasm32".into(),
         options,
     }

compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs

@@ -55,7 +55,7 @@ pub(crate) fn target() -> Target {
             std: Some(true),
         },
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
+        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20".into(),
         arch: "wasm32".into(),
         options,
     }

compiler/rustc_target/src/spec/targets/wasm32_wasip1_threads.rs

@@ -66,7 +66,7 @@ pub(crate) fn target() -> Target {
             std: Some(true),
         },
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
+        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20".into(),
         arch: "wasm32".into(),
         options,
     }

compiler/rustc_target/src/spec/targets/wasm32_wasip2.rs

@@ -66,7 +66,7 @@ pub(crate) fn target() -> Target {
             std: Some(true),
         },
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
+        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20".into(),
         arch: "wasm32".into(),
         options,
     }

compiler/rustc_target/src/spec/targets/wasm32v1_none.rs

@@ -44,7 +44,7 @@ pub(crate) fn target() -> Target {
             std: Some(false),
         },
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
+        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20".into(),
         arch: "wasm32".into(),
         options,
     }

compiler/rustc_target/src/spec/targets/wasm64_unknown_unknown.rs

@@ -40,7 +40,7 @@ pub(crate) fn target() -> Target {
             std: None, // ?
         },
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
+        data_layout: "e-m:e-p:64:64-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20".into(),
         arch: "wasm64".into(),
         options,
     }