Introduce env var to disable IGC optimization (#4301)

It disables all IGC optimizations. When debugging functional failures,
it is often useful to know if it passes with IGC optimizations disabled.
If a test case fails with IGC optimizations, and passes with IGC
optimizations disabled, then there is a high chance that the problem is
in IGC.

Signed-off-by: Whitney Tsang <[email protected]>

Author: whitneywhtsang

python/triton/knobs.py

@@ -494,6 +494,7 @@ class intel_knobs(base_knobs):
     advanced_path: env_bool = env_bool("TRITON_INTEL_ADVANCED_PATH", False)
     opt_reduction_locality: env_bool = env_bool("TRITON_INTEL_OPTIMIZE_REDUCTION_LOCALITY", False)
     reduce_transpose: env_bool = env_bool("TRITON_INTEL_REDUCE_TRANSPOSE", False)
+    disable_igc_opt: env_bool = env_bool("TRITON_INTEL_DISABLE_IGC_OPT", False)
 
     raise_block_pointer: env_str = env_str("TRITON_INTEL_RAISE_BLOCK_POINTER", "0")
     dump_spirv_kernel_args: env_opt_str = env_opt_str("TRITON_XPU_DUMP_SPIRV_KERNEL_ARGS")

third_party/intel/backend/compiler.py

@@ -378,6 +378,9 @@ def make_spv(src, metadata, options):
         else:
             metadata["build_flags"] = ""
 
+        if knobs.intel.disable_igc_opt:
+            metadata["build_flags"] += " -cl-opt-disable"
+
         metadata["generate_native_code"] = options.generate_native_code
 
         if options.generate_native_code: