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iris: Disable loop unrolling in GLSL IR.

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Leave it to NIR instead, like i965 does.  Thanks to Tim Arceri for
noticing that I'd left this enabled by accident.

shader-db results on Skylake:

total instructions in shared programs: 15522628 -> 15521642 (<.01%)
instructions in affected programs: 94008 -> 93022 (-1.05%)
helped: 34
HURT: 33
helped stats (abs) min: 12 max: 48 x̄: 33.82 x̃: 42
helped stats (rel) min: 0.06% max: 22.14% x̄: 9.86% x̃: 10.89%
HURT stats (abs)   min: 1 max: 16 x̄: 4.97 x̃: 3t
HURT stats (rel)   min: 0.82% max: 3.77% x̄: 1.73% x̃: 1.53%
95% mean confidence interval for instructions value: -20.08 -9.35
95% mean confidence interval for instructions %-change: -5.95% -2.36%
Instructions are helped.

total cycles in shared programs: 367105221 -> 367074230 (<.01%)
cycles in affected programs: 10017660 -> 9986669 (-0.31%)
helped: 266
HURT: 184
helped stats (abs) min: 1 max: 9556 x̄: 151.35 x̃: 12
helped stats (rel) min: 0.08% max: 59.91% x̄: 4.66% x̃: 1.67%
HURT stats (abs)   min: 1 max: 1716 x̄: 50.37 x̃: 6
HURT stats (rel)   min: <.01% max: 24.40% x̄: 2.42% x̃: 0.85%
95% mean confidence interval for cycles value: -133.90 -3.84
95% mean confidence interval for cycles %-change: -2.44% -1.10%
Cycles are helped.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
This commit is contained in:
Kenneth Graunke
2019-06-25 19:34:45 -07:00
parent acadeaff6a
commit 8551dc17a7
1 changed files with 1 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/gallium/drivers/iris/iris_screen.c
+1 -2
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@@ -411,8 +411,6 @@ iris_get_shader_param(struct pipe_screen *pscreen,
return PIPE_SHADER_IR_NIR;
case PIPE_SHADER_CAP_SUPPORTED_IRS:
return 1 << PIPE_SHADER_IR_NIR;
case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
return 32;
case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_LDEXP_SUPPORTED:
return 1;
@@ -422,6 +420,7 @@ iris_get_shader_param(struct pipe_screen *pscreen,
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
return 0;
default:
unreachable("unknown shader param");