RFC: intel/compiler: Don't always require precise lowering of flrpreview/lower-flrp

No changes on any other Intel platforms.

Iron Lake
total instructions in shared programs: 8178607 -> 8149683 (-0.35%)
instructions in affected programs: 3281553 -> 3252629 (-0.88%)
helped: 13676
HURT: 58
helped stats (abs) min: 1 max: 30 x̄: 2.12 x̃: 1
helped stats (rel) min: 0.04% max: 10.77% x̄: 1.16% x̃: 0.97%
HURT stats (abs)   min: 1 max: 4 x̄: 1.72 x̃: 1
HURT stats (rel)   min: 0.26% max: 11.11% x̄: 2.33% x̃: 1.33%
95% mean confidence interval for instructions value: -2.14 -2.07
95% mean confidence interval for instructions %-change: -1.16% -1.13%
Instructions are helped.

total cycles in shared programs: 188770066 -> 188636282 (-0.07%)
cycles in affected programs: 70484916 -> 70351132 (-0.19%)
helped: 12577
HURT: 511
helped stats (abs) min: 2 max: 600 x̄: 10.89 x̃: 6
helped stats (rel) min: <.01% max: 5.48% x̄: 0.48% x̃: 0.27%
HURT stats (abs)   min: 2 max: 62 x̄: 6.16 x̃: 4
HURT stats (rel)   min: 0.01% max: 4.48% x̄: 0.24% x̃: 0.07%
95% mean confidence interval for cycles value: -10.55 -9.89
95% mean confidence interval for cycles %-change: -0.46% -0.45%
Cycles are helped.

LOST:   0
GAINED: 13

GM45
total instructions in shared programs: 5019498 -> 5003969 (-0.31%)
instructions in affected programs: 1766424 -> 1750895 (-0.88%)
helped: 6998
HURT: 29
helped stats (abs) min: 1 max: 87 x̄: 2.23 x̃: 1
helped stats (rel) min: 0.03% max: 10.45% x̄: 1.14% x̃: 0.95%
HURT stats (abs)   min: 1 max: 4 x̄: 1.72 x̃: 1
HURT stats (rel)   min: 0.26% max: 10.00% x̄: 2.27% x̃: 1.32%
95% mean confidence interval for instructions value: -2.27 -2.15
95% mean confidence interval for instructions %-change: -1.14% -1.10%
Instructions are helped.

total cycles in shared programs: 128896720 -> 128811288 (-0.07%)
cycles in affected programs: 43646706 -> 43561274 (-0.20%)
helped: 6535
HURT: 181
helped stats (abs) min: 2 max: 600 x̄: 13.25 x̃: 6
helped stats (rel) min: <.01% max: 5.48% x̄: 0.51% x̃: 0.29%
HURT stats (abs)   min: 2 max: 48 x̄: 6.33 x̃: 6
HURT stats (rel)   min: 0.01% max: 4.48% x̄: 0.24% x̃: 0.07%
95% mean confidence interval for cycles value: -13.26 -12.18
95% mean confidence interval for cycles %-change: -0.51% -0.48%
Cycles are helped.

total spills in shared programs: 72 -> 61 (-15.28%)
spills in affected programs: 66 -> 55 (-16.67%)
helped: 1
HURT: 0

total fills in shared programs: 108 -> 94 (-12.96%)
fills in affected programs: 96 -> 82 (-14.58%)
helped: 1
HURT: 0

LOST:   13
GAINED: 13

1 files changed, 1 insertions, 1 deletions

diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index b612d22cf8e..d0ee4b96d67 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -612,7 +612,7 @@ brw_nir_optimize(nir_shader *nir, const struct brw_compiler *compiler,
           */
          if (OPT(nir_lower_flrp,
                  lower_flrp,
-                 is_scalar /* always_precise */,
+                 false /* always_precise */,
                  compiler->devinfo->gen >= 6)) {
             OPT(nir_opt_constant_folding);
          }