From: Eric Anholt Date: Sun, 13 Mar 2011 20:26:09 +0000 (-0700) Subject: i965/fs: Add support for 16-wide dispatch to the register allocator. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2ac1cb8b83ad1f7700cc40519a82c3cf698b543b;p=mesa.git i965/fs: Add support for 16-wide dispatch to the register allocator. Note that the virtual grfs are in increments of the dispatch_width, not hardware registers -- this makes the 16-wide emit and 8-wide emit mostly the same. Reviewed-by: Kenneth Graunke --- diff --git a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp index 67f29ce1816..1e2cf917116 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp @@ -48,11 +48,11 @@ extern "C" { #include "../glsl/ir_print_visitor.h" static void -assign_reg(int *reg_hw_locations, fs_reg *reg) +assign_reg(int *reg_hw_locations, fs_reg *reg, int reg_width) { if (reg->file == GRF && reg->reg != 0) { assert(reg->reg_offset >= 0); - reg->hw_reg = reg_hw_locations[reg->reg] + reg->reg_offset; + reg->hw_reg = reg_hw_locations[reg->reg] + reg->reg_offset * reg_width; reg->reg = 0; } } @@ -63,32 +63,48 @@ fs_visitor::assign_regs_trivial() int last_grf = 0; int hw_reg_mapping[this->virtual_grf_next]; int i; + int reg_width = c->dispatch_width / 8; hw_reg_mapping[0] = 0; - hw_reg_mapping[1] = this->first_non_payload_grf; + /* Note that compressed instructions require alignment to 2 registers. */ + hw_reg_mapping[1] = ALIGN(this->first_non_payload_grf, reg_width); for (i = 2; i < this->virtual_grf_next; i++) { hw_reg_mapping[i] = (hw_reg_mapping[i - 1] + - this->virtual_grf_sizes[i - 1]); + this->virtual_grf_sizes[i - 1] * reg_width); } - last_grf = hw_reg_mapping[i - 1] + this->virtual_grf_sizes[i - 1]; + last_grf = hw_reg_mapping[i - 1] + (this->virtual_grf_sizes[i - 1] * + reg_width); foreach_iter(exec_list_iterator, iter, this->instructions) { fs_inst *inst = (fs_inst *)iter.get(); - assign_reg(hw_reg_mapping, &inst->dst); - assign_reg(hw_reg_mapping, &inst->src[0]); - assign_reg(hw_reg_mapping, &inst->src[1]); + assign_reg(hw_reg_mapping, &inst->dst, reg_width); + assign_reg(hw_reg_mapping, &inst->src[0], reg_width); + assign_reg(hw_reg_mapping, &inst->src[1], reg_width); } - this->grf_used = last_grf + 1; + if (last_grf >= BRW_MAX_GRF) { + fail("Ran out of regs on trivial allocator (%d/%d)\n", + last_grf, BRW_MAX_GRF); + } + + this->grf_used = last_grf + reg_width; } bool fs_visitor::assign_regs() { + /* Most of this allocation was written for a reg_width of 1 + * (dispatch_width == 8). In extending to 16-wide, the code was + * left in place and it was converted to have the hardware + * registers it's allocating be contiguous physical pairs of regs + * for reg_width == 2. + */ + int reg_width = c->dispatch_width / 8; int last_grf = 0; int hw_reg_mapping[this->virtual_grf_next + 1]; - int base_reg_count = BRW_MAX_GRF - this->first_non_payload_grf; + int first_assigned_grf = ALIGN(this->first_non_payload_grf, reg_width); + int base_reg_count = (BRW_MAX_GRF - first_assigned_grf) / reg_width; int class_sizes[base_reg_count]; int class_count = 0; int aligned_pair_class = -1; @@ -157,8 +173,8 @@ fs_visitor::assign_regs() if (0) { printf("%d/%d conflicts %d/%d\n", - class_sizes[i], this->first_non_payload_grf + i_r, - class_sizes[c], this->first_non_payload_grf + c_r); + class_sizes[i], first_assigned_grf + i_r, + class_sizes[c], first_assigned_grf + c_r); } ra_add_reg_conflict(regs, @@ -172,7 +188,7 @@ fs_visitor::assign_regs() /* Add a special class for aligned pairs, which we'll put delta_x/y * in on gen5 so that we can do PLN. */ - if (brw->has_pln && intel->gen < 6) { + if (brw->has_pln && reg_width == 1 && intel->gen < 6) { int reg_count = (base_reg_count - 1) / 2; int unaligned_pair_class = 1; assert(class_sizes[unaligned_pair_class] == 2); @@ -182,7 +198,7 @@ fs_visitor::assign_regs() class_sizes[aligned_pair_class] = 2; class_base_reg[aligned_pair_class] = 0; class_reg_count[aligned_pair_class] = 0; - int start = (this->first_non_payload_grf & 1) ? 1 : 0; + int start = (first_assigned_grf & 1) ? 1 : 0; for (int i = 0; i < reg_count; i++) { ra_class_add_reg(regs, classes[aligned_pair_class], @@ -228,6 +244,8 @@ fs_visitor::assign_regs() if (reg == -1) { fail("no register to spill\n"); + } else if (c->dispatch_width == 16) { + fail("no spilling support on 16-wide yet\n"); } else { spill_reg(reg); } @@ -257,7 +275,7 @@ fs_visitor::assign_regs() } assert(hw_reg >= 0); - hw_reg_mapping[i] = this->first_non_payload_grf + hw_reg; + hw_reg_mapping[i] = first_assigned_grf + hw_reg * reg_width; last_grf = MAX2(last_grf, hw_reg_mapping[i] + this->virtual_grf_sizes[i] - 1); } @@ -265,12 +283,12 @@ fs_visitor::assign_regs() foreach_iter(exec_list_iterator, iter, this->instructions) { fs_inst *inst = (fs_inst *)iter.get(); - assign_reg(hw_reg_mapping, &inst->dst); - assign_reg(hw_reg_mapping, &inst->src[0]); - assign_reg(hw_reg_mapping, &inst->src[1]); + assign_reg(hw_reg_mapping, &inst->dst, reg_width); + assign_reg(hw_reg_mapping, &inst->src[0], reg_width); + assign_reg(hw_reg_mapping, &inst->src[1], reg_width); } - this->grf_used = last_grf + 1; + this->grf_used = last_grf + reg_width; ralloc_free(g); ralloc_free(regs);