Update wasm data layout

Author: nikic

compiler/rustc_codegen_llvm/src/context.rs

@@ -132,6 +132,14 @@ pub unsafe fn create_module(
     if llvm_util::get_version() < (12, 0, 0) && sess.target.arch == "powerpc64" {
         target_data_layout = strip_powerpc64_vectors(target_data_layout);
     }
+    if llvm_util::get_version() < (13, 0, 0) {
+        if sess.target.arch == "wasm32" {
+            target_data_layout = "e-m:e-p:32:32-i64:64-n32:64-S128".to_string();
+        }
+        if sess.target.arch == "wasm64" {
+            target_data_layout = "e-m:e-p:64:64-i64:64-n32:64-S128".to_string();
+        }
+    }
 
     // Ensure the data-layout values hardcoded remain the defaults.
     if sess.target.is_builtin {

compiler/rustc_target/src/spec/wasm32_unknown_emscripten.rs

@@ -43,7 +43,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "wasm32-unknown-emscripten".to_string(),
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128".to_string(),
+        data_layout: "e-m:e-p:32:32-i64:64-f128:64-n32:64-S128-ni:1:10:20".to_string(),
         arch: "wasm32".to_string(),
         options: opts,
     }

compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs

@@ -54,7 +54,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "wasm32-unknown-unknown".to_string(),
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128".to_string(),
+        data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128-ni:1:10:20".to_string(),
         arch: "wasm32".to_string(),
         options,
     }

compiler/rustc_target/src/spec/wasm32_wasi.rs

@@ -109,7 +109,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "wasm32-wasi".to_string(),
         pointer_width: 32,
-        data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128".to_string(),
+        data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128-ni:1:10:20".to_string(),
         arch: "wasm32".to_string(),
         options,
     }

compiler/rustc_target/src/spec/wasm64_unknown_unknown.rs

@@ -32,7 +32,7 @@ pub fn target() -> Target {
     Target {
         llvm_target: "wasm64-unknown-unknown".to_string(),
         pointer_width: 64,
-        data_layout: "e-m:e-p:64:64-i64:64-n32:64-S128".to_string(),
+        data_layout: "e-m:e-p:64:64-i64:64-n32:64-S128-ni:1:10:20".to_string(),
         arch: "wasm64".to_string(),
         options,
     }