Three source instructions didn't exist until Gen6.  vec4_generator has
assertions to catch this, but catching it in the visitor provides a
nicer backtrace.

Cc: "10.1" <mesa-sta...@lists.freedesktop.org>
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp 
b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index a2f7922..95e0064 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -128,6 +128,7 @@ vec4_visitor::emit(enum opcode opcode)
    vec4_instruction *                                                  \
    vec4_visitor::op(dst_reg dst, src_reg src0, src_reg src1, src_reg src2)\
    {                                                                   \
+      assert(brw->gen >= 6);                                           \
       return new(mem_ctx) vec4_instruction(this, BRW_OPCODE_##op, dst, \
                                           src0, src1, src2);           \
    }
-- 
1.9.0

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