Mesa (master): llvmpipe: store zero into all alloca'd values

[Keith Whitwell]

Module: Mesa
Branch: master
Commit: 6da29f36111edc821a4aa10128e9681fc75a43d7
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6da29f36111edc821a4aa10128e9681fc75a43d7

Author: Keith Whitwell <keithw at vmware.com>
Date:   Thu Oct  7 19:49:20 2010 +0100

llvmpipe: store zero into all alloca'd values

Fixes slowdown in isosurf with earlier versions of llvm.

---

 src/gallium/auxiliary/gallivm/lp_bld_flow.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_flow.c b/src/gallium/auxiliary/gallivm/lp_bld_flow.c
index 5bc9c74..cd5fbc2 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_flow.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_flow.c
@@ -830,6 +830,7 @@ lp_build_alloca(LLVMBuilderRef builder,
    }
 
    res = LLVMBuildAlloca(first_builder, type, name);
+   LLVMBuildStore(builder, LLVMConstNull(type), res);
 
    LLVMDisposeBuilder(first_builder);