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i965/fs: split out calculation of payload live ranges

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We'll need this for the scheduler too, since it wants to know when the
live ranges of payload registers end in order to model them in our
register pressure calculations.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Connor Abbott 2015-06-12 12:01:35 -07:00
parent 45cd76e342
commit c1860299b8
2 changed files with 31 additions and 22 deletions
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2
src/mesa/drivers/dri/i965/brw_fs.h
View file

@ -145,6 +145,8 @@ public:
void assign_vs_urb_setup();
bool assign_regs(bool allow_spilling);
void assign_regs_trivial();
void calculate_payload_ranges(int payload_node_count,
int *payload_last_use_ip);
void setup_payload_interference(struct ra_graph *g, int payload_reg_count,
int first_payload_node);
int choose_spill_reg(struct ra_graph *g);

51
src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
View file

@ -330,32 +330,12 @@ count_to_loop_end(const bblock_t *block)
unreachable("not reached");
}
/**
* Sets up interference between thread payload registers and the virtual GRFs
* to be allocated for program temporaries.
*
* We want to be able to reallocate the payload for our virtual GRFs, notably
* because the setup coefficients for a full set of 16 FS inputs takes up 8 of
* our 128 registers.
*
* The layout of the payload registers is:
*
* 0..payload.num_regs-1: fixed function setup (including bary coordinates).
* payload.num_regs..payload.num_regs+curb_read_lengh-1: uniform data
* payload.num_regs+curb_read_lengh..first_non_payload_grf-1: setup coefficients.
*
* And we have payload_node_count nodes covering these registers in order
* (note that in SIMD16, a node is two registers).
*/
void
fs_visitor::setup_payload_interference(struct ra_graph *g,
int payload_node_count,
int first_payload_node)
void fs_visitor::calculate_payload_ranges(int payload_node_count,
int *payload_last_use_ip)
{
int loop_depth = 0;
int loop_end_ip = 0;
int payload_last_use_ip[payload_node_count];
for (int i = 0; i < payload_node_count; i++)
payload_last_use_ip[i] = -1;
@ -426,6 +406,33 @@ fs_visitor::setup_payload_interference(struct ra_graph *g,
ip++;
}
}
/**
* Sets up interference between thread payload registers and the virtual GRFs
* to be allocated for program temporaries.
*
* We want to be able to reallocate the payload for our virtual GRFs, notably
* because the setup coefficients for a full set of 16 FS inputs takes up 8 of
* our 128 registers.
*
* The layout of the payload registers is:
*
* 0..payload.num_regs-1: fixed function setup (including bary coordinates).
* payload.num_regs..payload.num_regs+curb_read_lengh-1: uniform data
* payload.num_regs+curb_read_lengh..first_non_payload_grf-1: setup coefficients.
*
* And we have payload_node_count nodes covering these registers in order
* (note that in SIMD16, a node is two registers).
*/
void
fs_visitor::setup_payload_interference(struct ra_graph *g,
int payload_node_count,
int first_payload_node)
{
int payload_last_use_ip[payload_node_count];
calculate_payload_ranges(payload_node_count, payload_last_use_ip);
for (int i = 0; i < payload_node_count; i++) {
if (payload_last_use_ip[i] == -1)