Run curated spirv-opt passes through slang-glslang. (#3266)

* Run curated spirv-opt passes through slang-glslang.

* Cleanup.

* Replace spirv-dis downstream compiler with glslang.

* delete slang-spirv-opt.cpp.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 14 insertions, 10 deletions

diff --git a/source/slang/slang-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index 6d71f1a2c..16a88b8af 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -4815,18 +4815,22 @@ SlangResult emitSPIRVFromIR(
         (uint8_t const*) context.m_words.getBuffer(),
         context.m_words.getCount() * Index(sizeof(context.m_words[0])));
 
-    const auto validationResult = debugValidateSPIRV(spirvOut);
-    // If validation isn't available, don't say it failed, it's just a debug
-    // feature so we can skip
-    if(SLANG_FAILED(validationResult) && validationResult != SLANG_E_NOT_AVAILABLE)
+    StringBuilder runSpirvValEnvVar;
+    PlatformUtil::getEnvironmentVariable(UnownedStringSlice("SLANG_RUN_SPIRV_VALIDATION"), runSpirvValEnvVar);
+    if (runSpirvValEnvVar.getUnownedSlice() == "1")
     {
-        codeGenContext->getSink()->diagnoseWithoutSourceView(
-            SourceLoc{},
-            Diagnostics::spirvValidationFailed
-        );
-        return validationResult;
+        const auto validationResult = debugValidateSPIRV(spirvOut);
+        // If validation isn't available, don't say it failed, it's just a debug
+        // feature so we can skip
+        if (SLANG_FAILED(validationResult) && validationResult != SLANG_E_NOT_AVAILABLE)
+        {
+            codeGenContext->getSink()->diagnoseWithoutSourceView(
+                SourceLoc{},
+                Diagnostics::spirvValidationFailed
+            );
+            return validationResult;
+        }
     }
-
     return SLANG_OK;
 }