From 48203ea02250ba517f749a222092f091d9bef15e Mon Sep 17 00:00:00 2001
From: Darren Wihandi <65404740+fairywreath@users.noreply.github.com>
Date: Fri, 9 May 2025 23:26:43 -0400
Subject: Fix SPIRV unsigned to signed widening casts (#7051)

* Fix unsigned to signed casts for SPIRV

* Add test

* Fix ICE crash
---
 source/slang/slang-ir.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'source/slang/slang-ir.cpp')

diff --git a/source/slang/slang-ir.cpp b/source/slang/slang-ir.cpp
index a99eddebb..98c0fa471 100644
--- a/source/slang/slang-ir.cpp
+++ b/source/slang/slang-ir.cpp
@@ -7811,6 +7811,37 @@ IROp getIntTypeOpFromInfo(const IntInfo info)
     }
 }
 
+IROp getOppositeSignIntTypeOp(IROp op)
+{
+    switch (op)
+    {
+    case kIROp_UInt8Type:
+        return kIROp_Int8Type;
+    case kIROp_UInt16Type:
+        return kIROp_Int16Type;
+    case kIROp_UIntType:
+        return kIROp_IntType;
+    case kIROp_UInt64Type:
+        return kIROp_Int64Type;
+    case kIROp_UIntPtrType:
+        return kIROp_IntPtrType;
+
+    case kIROp_Int8Type:
+        return kIROp_UInt8Type;
+    case kIROp_Int16Type:
+        return kIROp_UInt16Type;
+    case kIROp_IntType:
+        return kIROp_UIntType;
+    case kIROp_Int64Type:
+        return kIROp_UInt64Type;
+    case kIROp_IntPtrType:
+        return kIROp_UIntPtrType;
+
+    default:
+        SLANG_UNEXPECTED("Unhandled type passed to getOppositeSignIntTypeOp");
+    }
+}
+
 FloatInfo getFloatingTypeInfo(const IRType* floatType)
 {
     switch (floatType->getOp())
-- 
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