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st/glsl_to_tgsi: use correct writemask when converting generic intrinsics

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This fixes a bug when lowering ballotARB: previously, using writemask 0xf,
emit_asm would create TGSI_OPCODE_BALLOT instructions that span two registers
to cover 4 64-bit channels. This could trample over other a neighbouring
temporary.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101360
Cc: 17.1 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Nicolai Hähnle 2017-06-12 10:53:07 +02:00
parent 25e5534734
commit b28938ffce
1 changed files with 2 additions and 0 deletions
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src/mesa/state_tracker/st_glsl_to_tgsi.cpp
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@ -3978,6 +3978,8 @@ glsl_to_tgsi_visitor::visit_generic_intrinsic(ir_call *ir, unsigned op)
ir->return_deref->accept(this);
st_dst_reg dst = st_dst_reg(this->result);
dst.writemask = u_bit_consecutive(0, ir->return_deref->var->type->vector_elements);
st_src_reg src[4] = { undef_src, undef_src, undef_src, undef_src };
unsigned num_src = 0;
foreach_in_list(ir_rvalue, param, &ir->actual_parameters) {