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radeonsi: for the tess barrier, only use emit_waitcnt on SI and LLVM 3.9+ 

Cc: 17.0 13.0 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák 2017-01-17 13:45:42 +01:00
parent 3a8f316e7b
commit 57f18623fb
1 changed files with 5 additions and 2 deletions
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7
src/gallium/drivers/radeonsi/si_shader.c
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@ -5440,10 +5440,13 @@ static void si_llvm_emit_barrier(const struct lp_build_tgsi_action *action,
struct si_shader_context *ctx = si_shader_context(bld_base);
struct gallivm_state *gallivm = bld_base->base.gallivm;
/* The real barrier instruction isn’t needed, because an entire patch
/* SI only (thanks to a hw bug workaround):
* The real barrier instruction isn’t needed, because an entire patch
* always fits into a single wave.
*/
if (ctx->type == PIPE_SHADER_TESS_CTRL) {
if (HAVE_LLVM >= 0x0309 &&
ctx->screen->b.chip_class == SI &&
ctx->type == PIPE_SHADER_TESS_CTRL) {
emit_waitcnt(ctx, LGKM_CNT & VM_CNT);
return;
}