From ee114b6cb15049a6be77c70c24c42db23e675e54 Mon Sep 17 00:00:00 2001
From: Daniel Micay <danielmicay@gmail.com>
Date: Wed, 2 Oct 2013 08:53:02 -0400
Subject: [PATCH] avoid alloca in with_overflow intrinsics

This is pointless, since it's just used to load an `undef` value and
never touched again.
---
 src/librustc/middle/trans/intrinsic.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc/middle/trans/intrinsic.rs b/src/librustc/middle/trans/intrinsic.rs
index 6d3b1396fc5..1c1c8a0a370 100644
--- a/src/librustc/middle/trans/intrinsic.rs
+++ b/src/librustc/middle/trans/intrinsic.rs
@@ -65,7 +65,7 @@ pub fn trans_intrinsic(ccx: @mut CrateContext,
         let val = Call(bcx, llfn, [a, b], []);
         let result = ExtractValue(bcx, val, 0);
         let overflow = ZExt(bcx, ExtractValue(bcx, val, 1), Type::bool());
-        let ret = Load(bcx, Alloca(bcx, type_of::type_of(bcx.ccx(), t), ""));
+        let ret = C_undef(type_of::type_of(bcx.ccx(), t));
         let ret = InsertValue(bcx, ret, result, 0);
         let ret = InsertValue(bcx, ret, overflow, 1);