[Beignet] [PATCH] Change the IVB/HSW's max_work_group_size to 512, and BYT to 256.

[Yang Rong]

To decide the kernel's work group size, application should get
CL_DEVICE_MAX_WORK_GROUP_SIZE first, and then get the CL_KERNEL_WORK_GROUP_SIZE
after clBuildProgram.
But some application only check the CL_DEVICE_MAX_WORK_GROUP_SIZE, and if kernel run
simd8 mode or other cause, may exceed the CL_KERNEL_WORK_GROUP_SIZE.
So change to CL_DEVICE_MAX_WORK_GROUP_SIZE to the minimum CL_KERNEL_WORK_GROUP_SIZE.

Signed-off-by: Yang Rong <rong.r.yang at intel.com>
---
 src/cl_device_id.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/src/cl_device_id.c b/src/cl_device_id.c
index 522c3c5..5ef0bde 100644
--- a/src/cl_device_id.c
+++ b/src/cl_device_id.c
@@ -42,8 +42,8 @@ static struct _cl_device_id intel_ivb_gt2_device = {
   .max_compute_unit = 16,
   .max_thread_per_unit = 8,
   .sub_slice_count = 2,
-  .max_work_item_sizes = {1024, 1024, 1024},
-  .max_work_group_size = 1024,
+  .max_work_item_sizes = {512, 512, 512},
+  .max_work_group_size = 512,
   .max_clock_frequency = 1000,
 #include "cl_gen7_device.h"
 };
@@ -64,8 +64,8 @@ static struct _cl_device_id intel_baytrail_t_device = {
   .max_compute_unit = 4,
   .max_thread_per_unit = 8,
   .sub_slice_count = 1,
-  .max_work_item_sizes = {512, 512, 512},
-  .max_work_group_size = 512,
+  .max_work_item_sizes = {256, 256, 256},
+  .max_work_group_size = 256,
   .max_clock_frequency = 1000,
 #include "cl_gen7_device.h"
 };
@@ -76,8 +76,8 @@ static struct _cl_device_id intel_hsw_gt1_device = {
   .max_compute_unit = 10,
   .max_thread_per_unit = 7,
   .sub_slice_count = 1,
-  .max_work_item_sizes = {1024, 1024, 1024},
-  .max_work_group_size = 1024,
+  .max_work_item_sizes = {512, 512, 512},
+  .max_work_group_size = 512,
   .max_clock_frequency = 1000,
 #include "cl_gen75_device.h"
 };
@@ -87,8 +87,8 @@ static struct _cl_device_id intel_hsw_gt2_device = {
   .max_compute_unit = 20,
   .max_thread_per_unit = 7,
   .sub_slice_count = 2,
-  .max_work_item_sizes = {1024, 1024, 1024},
-  .max_work_group_size = 1024,
+  .max_work_item_sizes = {512, 512, 512},
+  .max_work_group_size = 512,
   .max_clock_frequency = 1000,
 #include "cl_gen75_device.h"
 };
@@ -98,8 +98,8 @@ static struct _cl_device_id intel_hsw_gt3_device = {
   .max_compute_unit = 40,
   .max_thread_per_unit = 7,
   .sub_slice_count = 4,
-  .max_work_item_sizes = {1024, 1024, 1024},
-  .max_work_group_size = 1024,
+  .max_work_item_sizes = {512, 512, 512},
+  .max_work_group_size = 512,
   .max_clock_frequency = 1000,
 #include "cl_gen75_device.h"
 };
@@ -110,7 +110,7 @@ static struct _cl_device_id intel_brw_gt1_device = {
   .max_compute_unit = 12,
   .max_thread_per_unit = 7,
   .sub_slice_count = 2,
-  .max_work_item_sizes = {1024, 1024, 1024},
+  .max_work_item_sizes = {512, 512, 512},
   .max_work_group_size = 512,
   .max_clock_frequency = 1000,
 #include "cl_gen75_device.h"
@@ -121,7 +121,7 @@ static struct _cl_device_id intel_brw_gt2_device = {
   .max_compute_unit = 24,
   .max_thread_per_unit = 7,
   .sub_slice_count = 3,
-  .max_work_item_sizes = {1024, 1024, 1024},
+  .max_work_item_sizes = {512, 512, 512},
   .max_work_group_size = 512,
   .max_clock_frequency = 1000,
 #include "cl_gen75_device.h"
@@ -132,7 +132,7 @@ static struct _cl_device_id intel_brw_gt3_device = {
   .max_compute_unit = 48,
   .max_thread_per_unit = 7,
   .sub_slice_count = 6,
-  .max_work_item_sizes = {1024, 1024, 1024},
+  .max_work_item_sizes = {512, 512, 512},
   .max_work_group_size = 512,
   .max_clock_frequency = 1000,
 #include "cl_gen75_device.h"
@@ -669,9 +669,9 @@ cl_get_kernel_max_wg_sz(cl_kernel kernel)
     if(thread_cnt > 64)
       thread_cnt = 64;
     work_group_size = thread_cnt * simd_width;
-    if(work_group_size > kernel->program->ctx->device->max_work_group_size)
-      work_group_size = kernel->program->ctx->device->max_work_group_size;
   }
+  if(work_group_size > kernel->program->ctx->device->max_work_group_size)
+    work_group_size = kernel->program->ctx->device->max_work_group_size;
   return work_group_size;
 }
 
-- 
1.9.1