Add another test.

Author: python3kgae

clang/test/CodeGenHLSL/wavesize.hlsl

@@ -2,6 +2,10 @@
 // RUN:   dxil-pc-shadermodel6.6-compute %s -DSM66 -hlsl-entry foo \
 // RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s
 
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.8-compute %s -DNO_PREFERR -hlsl-entry foo \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s --check-prefix=NO_PREFERR
+
 // RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
 // RUN:   dxil-pc-shadermodel6.8-compute %s -hlsl-entry foo \
 // RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s --check-prefix=CHECK-SM68
@@ -11,12 +15,17 @@
 // CHECK:define void @foo()
 // CHECK:"hlsl.wavesize"="8,0,0"
 
+// NO_PREFERR:define void @foo()
+// NO_PREFERR:"hlsl.wavesize"="8,128,0"
+
 // CHECK-SM68:define void @foo()
 // CHECK-SM68:"hlsl.wavesize"="8,128,64"
 
 [numthreads(16,8,1)]
 #ifdef SM66
 [WaveSize(8)]
+#elif NO_PREFERR
+[WaveSize(8, 128)]
 #else
 [WaveSize(8, 128, 64)]
 #endif