tnl: Fix zeroing of the 3ub part of a 3ub+1ub attrib pair in SSE.

Bug #16520.

diff --git a/src/mesa/tnl/t_vertex_sse.c b/src/mesa/tnl/t_vertex_sse.c
index 07adc1e..7a255d6 100644 (file)
--- a/src/mesa/tnl/t_vertex_sse.c
+++ b/src/mesa/tnl/t_vertex_sse.c
@@ -354,6 +354,7 @@ static GLboolean build_vertex_emit( struct x86_program *p )
    struct x86_reg temp = x86_make_reg(file_XMM, 0);
    struct x86_reg vp0 = x86_make_reg(file_XMM, 1);
    struct x86_reg vp1 = x86_make_reg(file_XMM, 2);
+   struct x86_reg temp2 = x86_make_reg(file_XMM, 3);
    GLubyte *fixup, *label;
 
    /* Push a few regs?
@@ -526,7 +527,8 @@ static GLboolean build_vertex_emit( struct x86_program *p )
            sse_shufps(&p->func, temp, temp, SHUF(W,X,Y,Z));
 
            get_src_ptr(p, srcECX, vtxESI, &a[1]);
-           emit_load(p, temp, 1, x86_deref(srcECX), a[1].inputsize);
+           emit_load(p, temp2, 1, x86_deref(srcECX), a[1].inputsize);
+           sse_movss(&p->func, temp, temp2);
            update_src_ptr(p, srcECX, vtxESI, &a[1]);
 
            /* Rearrange and possibly do BGR conversion: