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nir: delete magic number 

Signed-off-by: Elie Tournier <tournier.elie@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Elie TOURNIER 2017-02-08 22:20:41 +00:00 committed by Jason Ekstrand
parent c3a94d9195
commit b10197e3a4
1 changed files with 11 additions and 1 deletions
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12
src/compiler/nir/nir_opt_loop_unroll.c
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@ -26,6 +26,16 @@
#include "nir_control_flow.h"
#include "nir_loop_analyze.h"
/* This limit is chosen fairly arbitrarily. GLSL IR max iteration is 32
* instructions. (Multiply counting nodes and magic number 5.) But there is
* no 1:1 mapping between GLSL IR and NIR so 25 was picked because it seemed
* to give about the same results. Around 5 instructions per node. But some
* loops that would unroll with GLSL IR fail to unroll if we set this to 25 so
* we set it to 26.
*/
#define LOOP_UNROLL_LIMIT 26
/* Prepare this loop for unrolling by first converting to lcssa and then
* converting the phis from the loops first block and the block that follows
* the loop into regs. Partially converting out of SSA allows us to unroll
@ -460,7 +470,7 @@ is_loop_small_enough_to_unroll(nir_shader *shader, nir_loop_info *li)
return true;
bool loop_not_too_large =
li->num_instructions * li->trip_count <= max_iter * 26;
li->num_instructions * li->trip_count <= max_iter * LOOP_UNROLL_LIMIT;
return loop_not_too_large;
}