[Mesa-dev] [PATCH] draw: (trivial) fix out-of-bounds vector initialization

[sroland at vmware.com]

From: Roland Scheidegger <sroland at vmware.com>

Was off-by-one. llvm says inserting an element with an index higher than the
number of elements yields undefined results. Previously such inserts were
ignored but as of llvm revision 235854 the vector gets replaced with undef,
causing failures.
This fixes piglit gl-3.2-layered-rendering-gl-layer, as mentioned in
https://llvm.org/bugs/show_bug.cgi?id=23424.

Cc: mesa-stable at lists.freedesktop.org
---
 src/gallium/auxiliary/draw/draw_llvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index 7150611..b9e55af 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -2048,7 +2048,7 @@ generate_mask_value(struct draw_gs_llvm_variant *variant,
 
    num_prims = lp_build_broadcast(gallivm, lp_build_vec_type(gallivm, mask_type),
                                   variant->num_prims);
-   for (i = 0; i <= gs_type.length; i++) {
+   for (i = 0; i < gs_type.length; i++) {
       LLVMValueRef idx = lp_build_const_int32(gallivm, i);
       mask_val = LLVMBuildInsertElement(builder, mask_val, idx, idx, "");
    }
-- 
2.1.4