From 09efd472a9ed60be6daa62d9339b0c5e6db92ee4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Steinbrink?= <bsteinbr@gmail.com>
Date: Mon, 20 May 2013 11:51:43 +0200
Subject: [PATCH] Remove outdated function transmute_for_stage0

The function was a workaround for bootstrapping that isn't required
anymore and just degrades hashmap performance, as it doesn't get inlined
cross-crate and turns a no-op into a call.
---
 src/libcore/hash.rs | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/src/libcore/hash.rs b/src/libcore/hash.rs
index d116c966c5c..69312f3a97b 100644
--- a/src/libcore/hash.rs
+++ b/src/libcore/hash.rs
@@ -76,16 +76,12 @@ pub trait Streaming {
     fn reset(&mut self);
 }
 
-fn transmute_for_stage0<'a>(bytes: &'a [u8]) -> &'a [u8] {
-    bytes
-}
-
 impl<A:IterBytes> Hash for A {
     #[inline(always)]
     fn hash_keyed(&self, k0: u64, k1: u64) -> u64 {
         let mut s = State::new(k0, k1);
         for self.iter_bytes(true) |bytes| {
-            s.input(transmute_for_stage0(bytes));
+            s.input(bytes);
         }
         s.result_u64()
     }
@@ -95,10 +91,10 @@ fn hash_keyed_2<A: IterBytes,
                 B: IterBytes>(a: &A, b: &B, k0: u64, k1: u64) -> u64 {
     let mut s = State::new(k0, k1);
     for a.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for b.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     s.result_u64()
 }
@@ -108,13 +104,13 @@ fn hash_keyed_3<A: IterBytes,
                 C: IterBytes>(a: &A, b: &B, c: &C, k0: u64, k1: u64) -> u64 {
     let mut s = State::new(k0, k1);
     for a.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for b.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for c.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     s.result_u64()
 }
@@ -132,16 +128,16 @@ fn hash_keyed_4<A: IterBytes,
                 -> u64 {
     let mut s = State::new(k0, k1);
     for a.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for b.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for c.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for d.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     s.result_u64()
 }
@@ -161,19 +157,19 @@ fn hash_keyed_5<A: IterBytes,
                 -> u64 {
     let mut s = State::new(k0, k1);
     for a.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for b.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for c.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for d.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     for e.iter_bytes(true) |bytes| {
-        s.input(transmute_for_stage0(bytes));
+        s.input(bytes);
     }
     s.result_u64()
 }