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aco/gfx12: disable vinterp ddx/ddy optimization

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This only seems to work on gfx11 and gfx11.5, and it's only faster on gfx11.5.

We could continue to use vinterp, with constants copied to vgprs, but
whether that's beneficial depends on the shader.

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>

Fixes: bee487df48 ("aco/gfx11.5+: use vinterp for fddx/fddy")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/12250
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32495>
This commit is contained in:
Georg Lehmann 2024-12-05 08:40:40 +01:00 • committed by Marge Bot
parent 3dd6ddde3b
commit 7425e71ae0
1 changed files with 5 additions and 1 deletions
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6
src/amd/compiler/aco_instruction_selection.cpp
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@ -8387,8 +8387,12 @@ visit_intrinsic(isel_context* ctx, nir_intrinsic_instr* instr)
} else {
aco_opcode subrev =
instr->def.bit_size == 16 ? aco_opcode::v_subrev_f16 : aco_opcode::v_subrev_f32;
/* v_interp with constant sources only works on GFX11/11.5,
* and it's only faster on GFX11.5.
*/
bool use_interp = dpp_ctrl1 == dpp_quad_perm(0, 0, 0, 0) && instr->def.bit_size == 32 &&
ctx->program->gfx_level >= GFX11_5;
ctx->program->gfx_level == GFX11_5;
if (!nir_src_is_divergent(&instr->src[0])) {
bld.vop2(subrev, Definition(dst), src, src);
} else if (use_interp && dpp_ctrl2 == dpp_quad_perm(1, 1, 1, 1)) {