diff options
| author | Ian Romanick <[email protected]> | 2018-06-27 17:25:34 -0700 |
|---|---|---|
| committer | Ian Romanick <[email protected]> | 2018-07-02 19:19:16 -0700 |
| commit | 995d9937103771d9318124b91adfd20d7c6d5fed (patch) | |
| tree | 4e161b9508aae8a6f4c67ae1a44379d0df2adca3 /src/compiler/glsl/linker_util.h | |
| parent | fb6dc8e8945117cfc9f8e1d8a5f27137a6bb902d (diff) | |
i965/vec4: Don't cmod propagate from CMP to ADD if the writemask isn't compatible
Otherwise we can incorrectly cmod propagate in situations like
add(8) g10<1>.xD g2<0>.xD -16D
...
cmp.ge.f0(8) null<1>D g2<0>.xD 16D
...
(+f0) sel(8) g21<1>.xyUD g14<4>.xyyyUD g18<4>.xyyyUD
Sadly, this change hurts quite a few shaders.
v2: Refactor writemask compatibility check into a separate function.
Suggested by Caio.
Ivy Bridge and Haswell had similar results. (Haswell shown)
total instructions in shared programs: 12968489 -> 12968738 (<.01%)
instructions in affected programs: 60679 -> 60928 (0.41%)
helped: 0
HURT: 249
HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1
HURT stats (rel) min: 0.22% max: 0.81% x̄: 0.46% x̃: 0.44%
95% mean confidence interval for instructions value: 1.00 1.00
95% mean confidence interval for instructions %-change: 0.44% 0.48%
Instructions are HURT.
total cycles in shared programs: 409171965 -> 409172317 (<.01%)
cycles in affected programs: 260056 -> 260408 (0.14%)
helped: 0
HURT: 176
HURT stats (abs) min: 2 max: 2 x̄: 2.00 x̃: 2
HURT stats (rel) min: 0.04% max: 0.34% x̄: 0.17% x̃: 0.17%
95% mean confidence interval for cycles value: 2.00 2.00
95% mean confidence interval for cycles %-change: 0.16% 0.18%
Cycles are HURT.
Sandy Bridge
total instructions in shared programs: 10423577 -> 10423753 (<.01%)
instructions in affected programs: 40667 -> 40843 (0.43%)
helped: 0
HURT: 176
HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1
HURT stats (rel) min: 0.29% max: 0.79% x̄: 0.48% x̃: 0.42%
95% mean confidence interval for instructions value: 1.00 1.00
95% mean confidence interval for instructions %-change: 0.46% 0.51%
Instructions are HURT.
total cycles in shared programs: 146097503 -> 146097855 (<.01%)
cycles in affected programs: 503990 -> 504342 (0.07%)
helped: 0
HURT: 176
HURT stats (abs) min: 2 max: 2 x̄: 2.00 x̃: 2
HURT stats (rel) min: 0.02% max: 0.36% x̄: 0.12% x̃: 0.11%
95% mean confidence interval for cycles value: 2.00 2.00
95% mean confidence interval for cycles %-change: 0.11% 0.13%
Cycles are HURT.
No changes on any other platforms.
Signed-off-by: Ian Romanick <[email protected]>
Fixes: cd635d149b2 i965/vec4: Propagate conditional modifiers from compares to adds
Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>
Diffstat (limited to 'src/compiler/glsl/linker_util.h')
0 files changed, 0 insertions, 0 deletions