radeonsi: use v_mad_f32 for fma
v_fma_f32 runs at FP64 rate (= slow). Alien Isolation and F1 2015 seem to use fma for all d3d multiply-add instructions, which is silly. This tries to restore performance for those games. The main difference between v_mad_f32 and v_fma_f32 is that v_mad doesn't support denormals, which we don't enable anyway, because they are slow too. Also, there is code size reduction: Totals from affected shaders: VGPRS: 109796 -> 109808 (0.01 %) Spilled SGPRs: 29995 -> 30022 (0.09 %) Spilled VGPRs: 12 -> 13 (8.33 %) <-- it's just one shader going from 12 to 13 Code Size: 6667596 -> 6476356 (-2.87 %) bytes Max Waves: 26931 -> 26899 (-0.12 %) I've not actually tested real performance. Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
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@ -1769,8 +1769,8 @@ void radeon_llvm_context_init(struct radeon_llvm_context *ctx, const char *tripl
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HAVE_LLVM >= 0x0308 ? "llvm.exp2.f32" : "llvm.AMDIL.exp.";
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bld_base->op_actions[TGSI_OPCODE_FLR].emit = build_tgsi_intrinsic_nomem;
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bld_base->op_actions[TGSI_OPCODE_FLR].intr_name = "llvm.floor.f32";
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bld_base->op_actions[TGSI_OPCODE_FMA].emit = build_tgsi_intrinsic_nomem;
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bld_base->op_actions[TGSI_OPCODE_FMA].intr_name = "llvm.fma.f32";
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bld_base->op_actions[TGSI_OPCODE_FMA].emit =
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bld_base->op_actions[TGSI_OPCODE_MAD].emit;
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bld_base->op_actions[TGSI_OPCODE_FRC].emit = emit_frac;
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bld_base->op_actions[TGSI_OPCODE_F2I].emit = emit_f2i;
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bld_base->op_actions[TGSI_OPCODE_F2U].emit = emit_f2u;
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