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Revert "[Impeller] migrate Gaussian shaders to half precision. (#40752)" (flutter/engine#40784)

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Revert "[Impeller] migrate Gaussian shaders to half precision."
This commit is contained in:
Jonah Williams
2023-03-30 10:49:11 -07:00
committed by GitHub
parent 33e5c46f72
commit 2e9cdc9bd8
9 changed files with 186 additions and 202 deletions
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40
engine/src/flutter/impeller/compiler/shader_lib/impeller/gaussian.glsl
View File

@@ -6,53 +6,51 @@
#define GAUSSIAN_GLSL_
#include <impeller/constants.glsl>
#include <impeller/types.glsl>
/// Gaussian distribution function.
float16_t IPGaussian(float16_t x, float16_t sigma) {
float16_t variance = sigma * sigma;
return exp(-0.5hf * x * x / variance) / (float16_t(kSqrtTwoPi) * sigma);
float IPGaussian(float x, float sigma) {
float variance = sigma * sigma;
return exp(-0.5 * x * x / variance) / (kSqrtTwoPi * sigma);
}
/// Abramowitz and Stegun erf approximation.
float16_t IPErf(float16_t x) {
float16_t a = abs(x);
float IPErf(float x) {
float a = abs(x);
// 0.278393*x + 0.230389*x^2 + 0.078108*x^4 + 1
float16_t b =
(0.278393hf + (0.230389hf + 0.078108hf * a * a) * a) * a + 1.0hf;
return sign(x) * (1.0hf - 1.0hf / (b * b * b * b));
float b = (0.278393 + (0.230389 + 0.078108 * a * a) * a) * a + 1.0;
return sign(x) * (1 - 1 / (b * b * b * b));
}
/// Vec2 variation for the Abramowitz and Stegun erf approximation.
f16vec2 IPVec2Erf(f16vec2 x) {
f16vec2 a = abs(x);
vec2 IPVec2Erf(vec2 x) {
vec2 a = abs(x);
// 0.278393*x + 0.230389*x^2 + 0.078108*x^4 + 1
f16vec2 b = (0.278393hf + (0.230389hf + 0.078108hf * a * a) * a) * a + 1.0hf;
return sign(x) * (1.0hf - 1.0hf / (b * b * b * b));
vec2 b = (0.278393 + (0.230389 + 0.078108 * a * a) * a) * a + 1.0;
return sign(x) * (1 - 1 / (b * b * b * b));
}
/// The indefinite integral of the Gaussian function.
/// Uses a very close approximation of Erf.
float16_t IPGaussianIntegral(float16_t x, float16_t sigma) {
float IPGaussianIntegral(float x, float sigma) {
// ( 1 + erf( x * (sqrt(2) / (2 * sigma) ) ) / 2
return (1.0hf + IPErf(x * (float16_t(kHalfSqrtTwo) / sigma))) * 0.5hf;
return (1 + IPErf(x * (kHalfSqrtTwo / sigma))) * 0.5;
}
/// Vec2 variation for the indefinite integral of the Gaussian function.
/// Uses a very close approximation of Erf.
f16vec2 IPVec2GaussianIntegral(f16vec2 x, float16_t sigma) {
vec2 IPVec2GaussianIntegral(vec2 x, float sigma) {
// ( 1 + erf( x * (sqrt(2) / (2 * sigma) ) ) / 2
return (1.0hf + IPVec2Erf(x * (float16_t(kHalfSqrtTwo) / sigma))) * 0.5hf;
return (1 + IPVec2Erf(x * (kHalfSqrtTwo / sigma))) * 0.5;
}
/// Simpler (but less accurate) approximation of the Gaussian integral.
f16vec2 IPVec2FastGaussianIntegral(f16vec2 x, float16_t sigma) {
return 1.0hf / (1.0hf + exp(float16_t(-kSqrtThree) / sigma * x));
vec2 IPVec2FastGaussianIntegral(vec2 x, float sigma) {
return 1 / (1 + exp(-kSqrtThree / sigma * x));
}
/// Simple logistic sigmoid with a domain of [-1, 1] and range of [0, 1].
float16_t IPSigmoid(float16_t x) {
return 1.03731472073hf / (1.0hf + exp(-4.0hf * x)) - 0.0186573603638hf;
float IPSigmoid(float x) {
return 1.03731472073 / (1 + exp(-4 * x)) - 0.0186573603638;
}
#endif

9
engine/src/flutter/impeller/compiler/shader_lib/impeller/texture.glsl
View File

@@ -143,15 +143,6 @@ vec4 IPSampleDecal(sampler2D texture_sampler, vec2 coords) {
return texture(texture_sampler, coords);
}
/// Sample a texture with decal tile mode.
f16vec4 IPHalfSampleDecal(f16sampler2D texture_sampler, f16vec2 coords) {
if (any(lessThan(coords, f16vec2(0.0hf))) ||
any(greaterThanEqual(coords, f16vec2(1.0)))) {
return f16vec4(0.0);
}
return texture(texture_sampler, coords);
}
/// Sample a texture, emulating a specific tile mode.
///
/// This is useful for Impeller graphics backend that don't have native support

42
engine/src/flutter/impeller/entity/shaders/border_mask_blur.frag
View File

@@ -15,42 +15,42 @@
// integral (using an erf approximation) to the 4 edges of the UV rectangle and
// multiplying them.
uniform f16sampler2D texture_sampler;
uniform sampler2D texture_sampler;
uniform FragInfo {
float16_t src_factor;
float16_t inner_blur_factor;
float16_t outer_blur_factor;
float src_factor;
float inner_blur_factor;
float outer_blur_factor;
f16vec2 sigma_uv;
vec2 sigma_uv;
}
frag_info;
in f16vec2 v_texture_coords;
in vec2 v_texture_coords;
out f16vec4 frag_color;
out vec4 frag_color;
float16_t BoxBlurMask(f16vec2 uv) {
float BoxBlurMask(vec2 uv) {
// LTRB
return IPGaussianIntegral(uv.x, frag_info.sigma_uv.x) * //
IPGaussianIntegral(uv.y, frag_info.sigma_uv.y) * //
IPGaussianIntegral(1.0hf - uv.x, frag_info.sigma_uv.x) * //
IPGaussianIntegral(1.0hf - uv.y, frag_info.sigma_uv.y);
return IPGaussianIntegral(uv.x, frag_info.sigma_uv.x) * //
IPGaussianIntegral(uv.y, frag_info.sigma_uv.y) * //
IPGaussianIntegral(1 - uv.x, frag_info.sigma_uv.x) * //
IPGaussianIntegral(1 - uv.y, frag_info.sigma_uv.y);
}
void main() {
f16vec4 image_color = texture(texture_sampler, v_texture_coords);
float16_t blur_factor = BoxBlurMask(v_texture_coords);
vec4 image_color = texture(texture_sampler, v_texture_coords);
float blur_factor = BoxBlurMask(v_texture_coords);
float16_t within_bounds =
float16_t(v_texture_coords.x >= 0.0hf && v_texture_coords.y >= 0.0hf &&
v_texture_coords.x < 1.0hf && v_texture_coords.y < 1.0hf);
float16_t inner_factor =
float within_bounds =
float(v_texture_coords.x >= 0 && v_texture_coords.y >= 0 &&
v_texture_coords.x < 1 && v_texture_coords.y < 1);
float inner_factor =
(frag_info.inner_blur_factor * blur_factor + frag_info.src_factor) *
within_bounds;
float16_t outer_factor =
frag_info.outer_blur_factor * blur_factor * (1.0hf - within_bounds);
float outer_factor =
frag_info.outer_blur_factor * blur_factor * (1 - within_bounds);
float16_t mask_factor = inner_factor + outer_factor;
float mask_factor = inner_factor + outer_factor;
frag_color = image_color * mask_factor;
}

6
engine/src/flutter/impeller/entity/shaders/border_mask_blur.vert
View File

@@ -15,10 +15,10 @@ frame_info;
in vec2 vertices;
in vec2 texture_coords;
out f16vec2 v_texture_coords;
out vec2 v_texture_coords;
void main() {
gl_Position = frame_info.mvp * vec4(vertices, 0.0, 1.0);
v_texture_coords = f16vec2(
IPRemapCoords(texture_coords, frame_info.texture_sampler_y_coord_scale));
v_texture_coords =
IPRemapCoords(texture_coords, frame_info.texture_sampler_y_coord_scale);
}

47
engine/src/flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur.glsl
View File

@@ -18,52 +18,52 @@
#include <impeller/texture.glsl>
#include <impeller/types.glsl>
uniform f16sampler2D texture_sampler;
uniform sampler2D texture_sampler;
uniform BlurInfo {
f16vec2 texture_size;
f16vec2 blur_direction;
vec2 texture_size;
vec2 blur_direction;
// The blur sigma and radius have a linear relationship which is defined
// host-side, but both are useful controls here. Sigma (pixels per standard
// deviation) is used to define the gaussian function itself, whereas the
// radius is used to limit how much of the function is integrated.
float16_t blur_sigma;
float16_t blur_radius;
float blur_sigma;
float blur_radius;
}
blur_info;
#if ENABLE_ALPHA_MASK
uniform f16sampler2D alpha_mask_sampler;
uniform sampler2D alpha_mask_sampler;
uniform MaskInfo {
float16_t src_factor;
float16_t inner_blur_factor;
float16_t outer_blur_factor;
float src_factor;
float inner_blur_factor;
float outer_blur_factor;
}
mask_info;
#endif
f16vec4 Sample(f16sampler2D tex, f16vec2 coords) {
vec4 Sample(sampler2D tex, vec2 coords) {
#if ENABLE_DECAL_SPECIALIZATION
return IPHalfSampleDecal(tex, coords);
return IPSampleDecal(tex, coords);
#else
return texture(tex, coords);
#endif
}
in f16vec2 v_texture_coords;
in f16vec2 v_src_texture_coords;
in vec2 v_texture_coords;
in vec2 v_src_texture_coords;
out f16vec4 frag_color;
out vec4 frag_color;
void main() {
f16vec4 total_color = f16vec4(0.0hf);
float16_t gaussian_integral = 0.0hf;
f16vec2 blur_uv_offset = blur_info.blur_direction / blur_info.texture_size;
vec4 total_color = vec4(0);
float gaussian_integral = 0;
vec2 blur_uv_offset = blur_info.blur_direction / blur_info.texture_size;
for (float16_t i = -blur_info.blur_radius; i <= blur_info.blur_radius; i++) {
float16_t gaussian = IPGaussian(i, blur_info.blur_sigma);
for (float i = -blur_info.blur_radius; i <= blur_info.blur_radius; i++) {
float gaussian = IPGaussian(i, blur_info.blur_sigma);
gaussian_integral += gaussian;
total_color +=
gaussian *
@@ -75,12 +75,11 @@ void main() {
frag_color = total_color / gaussian_integral;
#if ENABLE_ALPHA_MASK
f16vec4 src_color = Sample(alpha_mask_sampler, // sampler
v_src_texture_coords // texture coordinates
vec4 src_color = Sample(alpha_mask_sampler, // sampler
v_src_texture_coords // texture coordinates
);
float16_t blur_factor =
mask_info.inner_blur_factor * float16_t(src_color.a > 0.0hf) +
mask_info.outer_blur_factor * float16_t(src_color.a == 0.0hf);
float blur_factor = mask_info.inner_blur_factor * float(src_color.a > 0) +
mask_info.outer_blur_factor * float(src_color.a == 0);
frag_color = frag_color * blur_factor + src_color * mask_info.src_factor;
#endif

12
engine/src/flutter/impeller/entity/shaders/gaussian_blur/gaussian_blur.vert
View File

@@ -16,13 +16,13 @@ in vec2 vertices;
in vec2 texture_coords;
in vec2 src_texture_coords;
out f16vec2 v_texture_coords;
out f16vec2 v_src_texture_coords;
out vec2 v_texture_coords;
out vec2 v_src_texture_coords;
void main() {
gl_Position = frame_info.mvp * vec4(vertices, 0.0, 1.0);
v_texture_coords = f16vec2(
IPRemapCoords(texture_coords, frame_info.texture_sampler_y_coord_scale));
v_src_texture_coords = f16vec2(IPRemapCoords(
src_texture_coords, frame_info.alpha_mask_sampler_y_coord_scale));
v_texture_coords =
IPRemapCoords(texture_coords, frame_info.texture_sampler_y_coord_scale);
v_src_texture_coords = IPRemapCoords(
src_texture_coords, frame_info.alpha_mask_sampler_y_coord_scale);
}

61
engine/src/flutter/impeller/entity/shaders/rrect_blur.frag
View File

@@ -6,61 +6,58 @@
#include <impeller/types.glsl>
uniform FragInfo {
f16vec4 color;
f16vec2 rect_size;
float16_t blur_sigma;
float16_t corner_radius;
vec4 color;
float blur_sigma;
vec2 rect_size;
float corner_radius;
}
frag_info;
in f16vec2 v_position;
in vec2 v_position;
out f16vec4 frag_color;
out vec4 frag_color;
const int kSampleCount = 4;
float16_t RRectDistance(f16vec2 sample_position, f16vec2 half_size) {
f16vec2 space = abs(sample_position) - half_size + frag_info.corner_radius;
return length(max(space, float16_t(0.0hf))) +
min(max(space.x, space.y), float16_t(0.0hf)) - frag_info.corner_radius;
float RRectDistance(vec2 sample_position, vec2 half_size) {
vec2 space = abs(sample_position) - half_size + frag_info.corner_radius;
return length(max(space, 0.0)) + min(max(space.x, space.y), 0.0) -
frag_info.corner_radius;
}
/// Closed form unidirectional rounded rect blur mask solution using the
/// analytical Gaussian integral (with approximated erf).
float16_t RRectShadowX(f16vec2 sample_position, f16vec2 half_size) {
float RRectShadowX(vec2 sample_position, vec2 half_size) {
// Compute the X direction distance field (not incorporating the Y distance)
// for the rounded rect.
float16_t space =
min(float16_t(0.0hf),
half_size.y - frag_info.corner_radius - abs(sample_position.y));
float16_t rrect_distance =
float space =
min(0, half_size.y - frag_info.corner_radius - abs(sample_position.y));
float rrect_distance =
half_size.x - frag_info.corner_radius +
sqrt(max(
float16_t(0.0hf),
frag_info.corner_radius * frag_info.corner_radius - space * space));
sqrt(max(0, frag_info.corner_radius * frag_info.corner_radius -
space * space));
// Map the linear distance field to the approximate Gaussian integral.
f16vec2 integral = IPVec2FastGaussianIntegral(
sample_position.x + f16vec2(-rrect_distance, rrect_distance),
vec2 integral = IPVec2FastGaussianIntegral(
sample_position.x + vec2(-rrect_distance, rrect_distance),
frag_info.blur_sigma);
return integral.y - integral.x;
}
float16_t RRectShadow(f16vec2 sample_position, f16vec2 half_size) {
float RRectShadow(vec2 sample_position, vec2 half_size) {
// Limit the sampling range to 3 standard deviations in the Y direction from
// the kernel center to incorporate 99.7% of the color contribution.
float16_t half_sampling_range = frag_info.blur_sigma * 3.0hf;
float half_sampling_range = frag_info.blur_sigma * 3;
float16_t begin_y =
max(-half_sampling_range, sample_position.y - half_size.y);
float16_t end_y = min(half_sampling_range, sample_position.y + half_size.y);
float16_t interval = (end_y - begin_y) / float16_t(kSampleCount);
float begin_y = max(-half_sampling_range, sample_position.y - half_size.y);
float end_y = min(half_sampling_range, sample_position.y + half_size.y);
float interval = (end_y - begin_y) / kSampleCount;
// Sample the X blur kSampleCount times, weighted by the Gaussian function.
float16_t result = 0.0hf;
float result = 0;
for (int sample_i = 0; sample_i < kSampleCount; sample_i++) {
float16_t y = begin_y + interval * (float16_t(sample_i) + 0.5hf);
result += RRectShadowX(f16vec2(sample_position.x, sample_position.y - y),
float y = begin_y + interval * (sample_i + 0.5);
result += RRectShadowX(vec2(sample_position.x, sample_position.y - y),
half_size) *
IPGaussian(y, frag_info.blur_sigma) * interval;
}
@@ -71,10 +68,10 @@ float16_t RRectShadow(f16vec2 sample_position, f16vec2 half_size) {
void main() {
frag_color = frag_info.color;
f16vec2 half_size = frag_info.rect_size * 0.5hf;
f16vec2 sample_position = v_position - half_size;
vec2 half_size = frag_info.rect_size * 0.5;
vec2 sample_position = v_position - half_size;
if (frag_info.blur_sigma > 0.0hf) {
if (frag_info.blur_sigma > 0) {
frag_color *= RRectShadow(sample_position, half_size);
} else {
frag_color *= -RRectDistance(sample_position, half_size);

4
engine/src/flutter/impeller/entity/shaders/rrect_blur.vert
View File

@@ -11,10 +11,10 @@ frame_info;
in vec2 position;
out f16vec2 v_position;
out vec2 v_position;
void main() {
gl_Position = frame_info.mvp * vec4(position, 0.0, 1.0);
// The fragment stage uses local coordinates to compute the blur.
v_position = f16vec2(position);
v_position = position;
}

167
engine/src/flutter/impeller/tools/malioc.json
View File

@@ -1440,7 +1440,7 @@
"uses_late_zs_update": false,
"variants": {
"Main": {
"fp16_arithmetic": 44,
"fp16_arithmetic": 5,
"has_stack_spilling": false,
"performance": {
"longest_path_bound_pipelines": [
@@ -1448,8 +1448,8 @@
"arith_fma"
],
"longest_path_cycles": [
0.875,
0.875,
0.8125,
0.8125,
0.203125,
0.25,
0.0,
@@ -1470,8 +1470,8 @@
"arith_fma"
],
"shortest_path_cycles": [
0.875,
0.875,
0.8125,
0.8125,
0.203125,
0.25,
0.0,
@@ -1483,8 +1483,8 @@
"arith_fma"
],
"total_cycles": [
0.875,
0.875,
0.8125,
0.8125,
0.203125,
0.25,
0.0,
@@ -1495,7 +1495,7 @@
"stack_spill_bytes": 0,
"thread_occupancy": 100,
"uniform_registers_used": 12,
"work_registers_used": 18
"work_registers_used": 22
}
}
}
@@ -5806,7 +5806,7 @@
"uses_late_zs_update": false,
"variants": {
"Main": {
"fp16_arithmetic": 86,
"fp16_arithmetic": 10,
"has_stack_spilling": false,
"performance": {
"longest_path_bound_pipelines": [
@@ -5814,9 +5814,9 @@
"arith_fma"
],
"longest_path_cycles": [
0.90625,
0.90625,
0.265625,
0.8125,
0.8125,
0.234375,
0.25,
0.0,
0.25,
@@ -5836,9 +5836,9 @@
"arith_fma"
],
"shortest_path_cycles": [
0.90625,
0.90625,
0.234375,
0.8125,
0.8125,
0.203125,
0.25,
0.0,
0.25,
@@ -5849,9 +5849,9 @@
"arith_fma"
],
"total_cycles": [
0.90625,
0.90625,
0.265625,
0.8125,
0.8125,
0.234375,
0.25,
0.0,
0.25,
@@ -5860,8 +5860,8 @@
},
"stack_spill_bytes": 0,
"thread_occupancy": 100,
"uniform_registers_used": 12,
"work_registers_used": 29
"uniform_registers_used": 10,
"work_registers_used": 32
}
}
},
@@ -5906,7 +5906,7 @@
},
"thread_occupancy": 100,
"uniform_registers_used": 1,
"work_registers_used": 2
"work_registers_used": 3
}
}
}
@@ -6636,7 +6636,7 @@
"uses_late_zs_update": false,
"variants": {
"Main": {
"fp16_arithmetic": 68,
"fp16_arithmetic": 63,
"has_stack_spilling": false,
"performance": {
"longest_path_bound_pipelines": [
@@ -6662,13 +6662,14 @@
],
"shortest_path_bound_pipelines": [
"arith_total",
"arith_cvt",
"arith_sfu",
"varying"
],
"shortest_path_cycles": [
0.25,
0.15625,
0.1875,
0.171875,
0.25,
0.25,
0.0,
0.25,
@@ -6683,7 +6684,7 @@
"total_cycles": [
0.5,
0.359375,
0.421875,
0.484375,
0.5,
0.0,
0.5,
@@ -6692,7 +6693,7 @@
},
"stack_spill_bytes": 0,
"thread_occupancy": 100,
"uniform_registers_used": 12,
"uniform_registers_used": 10,
"work_registers_used": 21
}
}
@@ -6723,7 +6724,7 @@
"arithmetic"
],
"shortest_path_cycles": [
3.9600000381469727,
4.619999885559082,
2.0,
0.0
],
@@ -6731,7 +6732,7 @@
"arithmetic"
],
"total_cycles": [
8.0,
8.666666984558105,
2.0,
2.0
]
@@ -6756,7 +6757,7 @@
"uses_late_zs_update": false,
"variants": {
"Main": {
"fp16_arithmetic": 64,
"fp16_arithmetic": 58,
"has_stack_spilling": false,
"performance": {
"longest_path_bound_pipelines": [
@@ -6785,9 +6786,9 @@
"texture"
],
"shortest_path_cycles": [
0.15625,
0.15625,
0.09375,
0.171875,
0.171875,
0.109375,
0.0625,
0.0,
0.25,
@@ -6800,7 +6801,7 @@
"total_cycles": [
0.359375,
0.359375,
0.21875,
0.234375,
0.125,
0.0,
0.5,
@@ -6810,7 +6811,7 @@
"stack_spill_bytes": 0,
"thread_occupancy": 100,
"uniform_registers_used": 12,
"work_registers_used": 19
"work_registers_used": 20
}
}
},
@@ -6840,7 +6841,7 @@
"arithmetic"
],
"shortest_path_cycles": [
2.9700000286102295,
3.299999952316284,
2.0,
1.0
],
@@ -6848,14 +6849,14 @@
"arithmetic"
],
"total_cycles": [
5.0,
5.333333492279053,
2.0,
2.0
]
},
"thread_occupancy": 100,
"uniform_registers_used": 2,
"work_registers_used": 3
"work_registers_used": 4
}
}
}
@@ -6873,7 +6874,7 @@
"uses_late_zs_update": false,
"variants": {
"Main": {
"fp16_arithmetic": 70,
"fp16_arithmetic": 61,
"has_stack_spilling": false,
"performance": {
"longest_path_bound_pipelines": [
@@ -6899,13 +6900,12 @@
],
"shortest_path_bound_pipelines": [
"arith_total",
"arith_cvt",
"arith_sfu"
"arith_cvt"
],
"shortest_path_cycles": [
0.0625,
0.03125,
0.0625,
0.078125,
0.046875,
0.078125,
0.0625,
0.0,
0.0,
@@ -6918,7 +6918,7 @@
"total_cycles": [
0.3125,
0.234375,
0.28125,
0.296875,
0.3125,
0.0,
0.25,
@@ -6958,7 +6958,7 @@
"arithmetic"
],
"shortest_path_cycles": [
2.309999942779541,
2.9700000286102295,
1.0,
0.0
],
@@ -6966,7 +6966,7 @@
"arithmetic"
],
"total_cycles": [
6.0,
6.666666507720947,
1.0,
1.0
]
@@ -6991,7 +6991,7 @@
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@@ -7017,13 +7017,12 @@
],
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@@ -7036,7 +7035,7 @@
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@@ -7046,7 +7045,7 @@
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@@ -7076,7 +7075,7 @@
"arithmetic"
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@@ -7084,14 +7083,14 @@
"arithmetic"
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@@ -8921,17 +8920,17 @@
"uses_late_zs_update": false,
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@@ -8961,12 +8960,12 @@
],
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@@ -8975,7 +8974,7 @@
},
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@@ -8990,12 +8989,12 @@
"has_stack_spilling": false,
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null
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@@ -9014,14 +9013,14 @@
"arithmetic"
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@@ -12274,17 +12273,17 @@
"uses_late_zs_update": false,
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@@ -12314,12 +12313,12 @@
],
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@@ -12329,7 +12328,7 @@
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