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i965/fs: Combine assign_constant_locations and move_uniform_array_access_to_pull_constants

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The comment above move_uniform_array_access_to_pull_constants was
completely bogus because it has nothing to do with lowering instructions.
Instead, it's assiging locations of pull constants.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand 2015-08-18 17:04:53 -07:00
parent c999a58f50
commit dfacae3a56
2 changed files with 11 additions and 30 deletions
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40
src/mesa/drivers/dri/i965/brw_fs.cpp
View file

@ -1766,21 +1766,21 @@ fs_visitor::compact_virtual_grfs()
return progress;
}
/*
* Implements array access of uniforms by inserting a
* PULL_CONSTANT_LOAD instruction.
/**
* Assign UNIFORM file registers to either push constants or pull constants.
*
* Unlike temporary GRF array access (where we don't support it due to
* the difficulty of doing relative addressing on instruction
* destinations), we could potentially do array access of uniforms
* that were loaded in GRF space as push constants. In real-world
* usage we've seen, though, the arrays being used are always larger
* than we could load as push constants, so just always move all
* uniform array access out to a pull constant buffer.
* We allow a fragment shader to have more than the specified minimum
* maximum number of fragment shader uniform components (64). If
* there are too many of these, they'd fill up all of register space.
* So, this will push some of them out to the pull constant buffer and
* update the program to load them. We also use pull constants for all
* indirect constant loads because we don't support indirect accesses in
* registers yet.
*/
void
fs_visitor::move_uniform_array_access_to_pull_constants()
fs_visitor::assign_constant_locations()
{
/* Only the first compile (SIMD8 mode) gets to decide on locations. */
if (dispatch_width != 8)
return;
@ -1817,23 +1817,6 @@ fs_visitor::move_uniform_array_access_to_pull_constants()
}
}
}
}
/**
* Assign UNIFORM file registers to either push constants or pull constants.
*
* We allow a fragment shader to have more than the specified minimum
* maximum number of fragment shader uniform components (64). If
* there are too many of these, they'd fill up all of register space.
* So, this will push some of them out to the pull constant buffer and
* update the program to load them.
*/
void
fs_visitor::assign_constant_locations()
{
/* Only the first compile (SIMD8 mode) gets to decide on locations. */
if (dispatch_width != 8)
return;
/* Find which UNIFORM registers are still in use. */
bool is_live[uniforms];
@ -4805,7 +4788,6 @@ fs_visitor::optimize()
split_virtual_grfs();
move_uniform_array_access_to_pull_constants();
assign_constant_locations();
demote_pull_constants();

1
src/mesa/drivers/dri/i965/brw_fs.h
View file

@ -146,7 +146,6 @@ public:
void spill_reg(int spill_reg);
void split_virtual_grfs();
bool compact_virtual_grfs();
void move_uniform_array_access_to_pull_constants();
void assign_constant_locations();
void demote_pull_constants();
void invalidate_live_intervals();