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i965/fs_cse: Factor out code to create copy instructions

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v2: Get rid of the block parameter and make src a const reference

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand 2015-03-24 15:06:24 -07:00
parent cf4607e853
commit a9ccb14d14
1 changed files with 36 additions and 35 deletions
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71
src/mesa/drivers/dri/i965/brw_fs_cse.cpp
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@ -185,6 +185,29 @@ instructions_match(fs_inst *a, fs_inst *b, bool *negate)
operands_match(a, b, negate);
}
static fs_inst *
create_copy_instr(fs_visitor *v, fs_inst *inst, fs_reg src, bool negate)
{
int written = inst->regs_written;
int dst_width = inst->dst.width / 8;
fs_reg dst = inst->dst;
fs_inst *copy;
if (written > dst_width) {
fs_reg *sources = ralloc_array(v->mem_ctx, fs_reg, written / dst_width);
for (int i = 0; i < written / dst_width; i++)
sources[i] = offset(src, i);
copy = v->LOAD_PAYLOAD(dst, sources, written / dst_width);
} else {
copy = v->MOV(dst, src);
copy->force_writemask_all = inst->force_writemask_all;
copy->src[0].negate = negate;
}
assert(copy->regs_written == written);
return copy;
}
bool
fs_visitor::opt_cse_local(bblock_t *block)
{
@ -230,49 +253,27 @@ fs_visitor::opt_cse_local(bblock_t *block)
bool no_existing_temp = entry->tmp.file == BAD_FILE;
if (no_existing_temp && !entry->generator->dst.is_null()) {
int written = entry->generator->regs_written;
int dst_width = entry->generator->dst.width / 8;
assert(written % dst_width == 0);
assert((written * 8) % entry->generator->dst.width == 0);
fs_reg orig_dst = entry->generator->dst;
fs_reg tmp = fs_reg(GRF, alloc.allocate(written),
orig_dst.type, orig_dst.width);
entry->tmp = tmp;
entry->generator->dst = tmp;
entry->tmp = fs_reg(GRF, alloc.allocate(written),
entry->generator->dst.type,
entry->generator->dst.width);
fs_inst *copy;
if (written > dst_width) {
fs_reg *sources = ralloc_array(mem_ctx, fs_reg, written / dst_width);
for (int i = 0; i < written / dst_width; i++)
sources[i] = offset(tmp, i);
copy = LOAD_PAYLOAD(orig_dst, sources, written / dst_width);
} else {
copy = MOV(orig_dst, tmp);
copy->force_writemask_all =
entry->generator->force_writemask_all;
}
fs_inst *copy = create_copy_instr(this, entry->generator,
entry->tmp, false);
entry->generator->insert_after(block, copy);
entry->generator->dst = entry->tmp;
}
/* dest <- temp */
if (!inst->dst.is_null()) {
int written = inst->regs_written;
int dst_width = inst->dst.width / 8;
assert(written == entry->generator->regs_written);
assert(dst_width == entry->generator->dst.width / 8);
assert(inst->regs_written == entry->generator->regs_written);
assert(inst->dst.width == entry->generator->dst.width);
assert(inst->dst.type == entry->tmp.type);
fs_reg dst = inst->dst;
fs_reg tmp = entry->tmp;
fs_inst *copy;
if (written > dst_width) {
fs_reg *sources = ralloc_array(mem_ctx, fs_reg, written / dst_width);
for (int i = 0; i < written / dst_width; i++)
sources[i] = offset(tmp, i);
copy = LOAD_PAYLOAD(dst, sources, written / dst_width);
} else {
copy = MOV(dst, tmp);
copy->force_writemask_all = inst->force_writemask_all;
copy->src[0].negate = negate;
}
fs_inst *copy = create_copy_instr(this, inst,
entry->tmp, negate);
inst->insert_before(block, copy);
}