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aco: optimize AC_FETCH_FORMAT_SNORM alpha adjust

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This looks like it was copied from LLVM, which didn't have a fmax
intrinsic.

fossil-db (GFX8):
Totals from 43 (0.03% of 140385) affected shaders:
CodeSize: 49660 -> 49488 (-0.35%)
Instrs: 10434 -> 10348 (-0.82%)
Cycles: 41736 -> 41392 (-0.82%)
VMEM: 13793 -> 13719 (-0.54%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8918>
This commit is contained in:
Rhys Perry 2021-02-08 15:37:02 +00:00 • committed by Marge Bot
parent bd7d8a77e9
commit e8220e106b
1 changed files with 3 additions and 4 deletions
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7
src/amd/compiler/aco_instruction_selection.cpp
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@ -4854,14 +4854,13 @@ Temp adjust_vertex_fetch_alpha(isel_context *ctx, unsigned adjustment, Temp alph
* and happen to contain 0, 1, 2, 3 as the two LSBs of the * and happen to contain 0, 1, 2, 3 as the two LSBs of the
* exponent. * exponent.
*/ */
alpha = bld.vop2(aco_opcode::v_lshlrev_b32, bld.def(v1), Operand(adjustment == AC_FETCH_FORMAT_SNORM ? 7u : 30u), alpha); unsigned offset = adjustment == AC_FETCH_FORMAT_SNORM ? 7u : 30u;
alpha = bld.vop2(aco_opcode::v_ashrrev_i32, bld.def(v1), Operand(30u), alpha); alpha = bld.vop3(aco_opcode::v_bfe_i32, bld.def(v1), alpha, Operand(offset), Operand(2u));
/* Convert back to the right type. */ /* Convert back to the right type. */
if (adjustment == AC_FETCH_FORMAT_SNORM) { if (adjustment == AC_FETCH_FORMAT_SNORM) {
alpha = bld.vop1(aco_opcode::v_cvt_f32_i32, bld.def(v1), alpha); alpha = bld.vop1(aco_opcode::v_cvt_f32_i32, bld.def(v1), alpha);
Temp clamp = bld.vopc(aco_opcode::v_cmp_le_f32, bld.hint_vcc(bld.def(bld.lm)), Operand(0xbf800000u), alpha); alpha = bld.vop2(aco_opcode::v_max_f32, bld.def(v1), Operand(0xbf800000u), alpha);
alpha = bld.vop2(aco_opcode::v_cndmask_b32, bld.def(v1), Operand(0xbf800000u), alpha, clamp);
} else if (adjustment == AC_FETCH_FORMAT_SSCALED) { } else if (adjustment == AC_FETCH_FORMAT_SSCALED) {
alpha = bld.vop1(aco_opcode::v_cvt_f32_i32, bld.def(v1), alpha); alpha = bld.vop1(aco_opcode::v_cvt_f32_i32, bld.def(v1), alpha);
} }