From 8e9c5b96fbaa338e0b60e3e8c0127e0b3e4cee76 Mon Sep 17 00:00:00 2001
From: Graydon Hoare <graydon@mozilla.com>
Date: Sat, 2 Apr 2011 19:03:43 -0700
Subject: Change rust_vec to have a 16-byte header, to 16-byte-align vec-body
 data. Major perf win.

---
 src/comp/back/abi.rs     | 3 ++-
 src/comp/middle/trans.rs | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/comp')

diff --git a/src/comp/back/abi.rs b/src/comp/back/abi.rs
index 95958814..42a87623 100644
--- a/src/comp/back/abi.rs
+++ b/src/comp/back/abi.rs
@@ -26,7 +26,8 @@ const int general_code_alignment = 16;
 const int vec_elt_rc = 0;
 const int vec_elt_alloc = 1;
 const int vec_elt_fill = 2;
-const int vec_elt_data = 3;
+const int vec_elt_pad = 3;
+const int vec_elt_data = 4;
 
 const int tydesc_field_first_param = 0;
 const int tydesc_field_size = 1;
diff --git a/src/comp/middle/trans.rs b/src/comp/middle/trans.rs
index 2e4f1d85..ee3ea2cd 100644
--- a/src/comp/middle/trans.rs
+++ b/src/comp/middle/trans.rs
@@ -372,6 +372,7 @@ fn T_vec(TypeRef t) -> TypeRef {
     ret T_struct(vec(T_int(),       // Refcount
                      T_int(),       // Alloc
                      T_int(),       // Fill
+                     T_int(),       // Pad
                      T_array(t, 0u) // Body elements
                      ));
 }
@@ -870,6 +871,7 @@ fn C_str(@crate_ctxt cx, str s) -> ValueRef {
     auto box = C_struct(vec(C_int(abi.const_refcount as int),
                             C_int(len + 1u as int), // 'alloc'
                             C_int(len + 1u as int), // 'fill'
+                            C_int(0),               // 'pad'
                             llvm.LLVMConstString(_str.buf(s),
                                                  len, False)));
     auto g = llvm.LLVMAddGlobal(cx.llmod, val_ty(box),
-- 
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