P4 to Git Change 2010785 by gandryey@gera-win10 on 2019/10/09 12:00:14

SWDEV-205994 - [CQE OCL][NAVI10][DTB-BLOCKER] ~ 10% -50% performance drop observed while running IndigoBench Benchmark | Faulty CL#2007647
	- PAL changed the value reported in numAvailableVgprs on Navi10. Runtime has to switch to vgprsPerSimd for scratch buffer size calculation.

Affected files ...

... //depot/stg/opencl/drivers/opencl/runtime/device/pal/paldevice.cpp#172 edit

rocclr/runtime/device/pal/paldevice.cpp

@@ -2032,7 +2032,7 @@ bool Device::allocScratch(uint regNum, const VirtualGPU* vgpu, uint vgprs) {
     // Calculate the size of the scratch buffer for a queue
     uint32_t numTotalCUs = properties().gfxipProperties.shaderCore.numAvailableCus;
     // Find max waves based on VGPR per SIMD
-    uint32_t numMaxWaves = properties().gfxipProperties.shaderCore.numAvailableVgprs / vgprs;
+    uint32_t numMaxWaves = properties().gfxipProperties.shaderCore.vgprsPerSimd / vgprs;
     // Find max waves per CU
     numMaxWaves *= properties().gfxipProperties.shaderCore.numSimdsPerCu;
     // Find max waves per device