From a09d554721ecf0c6d967d5f55b3416e3284e71f2 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Thu, 27 Feb 2025 22:22:46 -0800
Subject: Fix regression in float to bool conversion. (#6497)

---
 source/slang/slang-ir.cpp      |  9 ++++++++-
 tests/bugs/float-to-bool.slang | 25 +++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 tests/bugs/float-to-bool.slang

diff --git a/source/slang/slang-ir.cpp b/source/slang/slang-ir.cpp
index 3a7ace37d..1b0f99cd3 100644
--- a/source/slang/slang-ir.cpp
+++ b/source/slang/slang-ir.cpp
@@ -4047,7 +4047,7 @@ IRInst* IRBuilder::emitCast(IRType* type, IRInst* value, bool fallbackToBuiltinC
         /* From Float */
         {kIROp_CastFloatToInt,
          kIROp_FloatCast,
-         {kIROp_CastFloatToInt, kIROp_IntCast},
+         {kIROp_Neq},
          {kIROp_CastFloatToInt, kIROp_CastIntToPtr},
          kIROp_CastToVoid},
         /* From Bool  */
@@ -4079,6 +4079,13 @@ IRInst* IRBuilder::emitCast(IRType* type, IRInst* value, bool fallbackToBuiltinC
                 matType->getColumnCount(),
                 matType->getLayout());
     }
+
+    if (op.op0 == kIROp_Neq)
+    {
+        IRInst* args[2] = {value, emitDefaultConstruct(value->getDataType())};
+        return emitIntrinsicInst(type, op.op0, 2, args);
+    }
+
     auto result = emitIntrinsicInst(t, op.op0, 1, &value);
     if (op.op1 != kIROp_Nop)
     {
diff --git a/tests/bugs/float-to-bool.slang b/tests/bugs/float-to-bool.slang
new file mode 100644
index 000000000..5ee605f5a
--- /dev/null
+++ b/tests/bugs/float-to-bool.slang
@@ -0,0 +1,25 @@
+//TEST:COMPARE_COMPUTE(filecheck-buffer=CHECK): -xslang -Wno-30081
+//TEST:COMPARE_COMPUTE(filecheck-buffer=CHECK): -vk -xslang -Wno-30081
+
+//TEST_INPUT: set outputBuffer = out ubuffer(data=[0 0 0 0 0], stride = 4)
+RWStructuredBuffer<int> outputBuffer;
+
+//TEST_INPUT: set inputBuffer = ubuffer(data=[0.0 0.2 1.0 1.2], stride = 4)
+RWStructuredBuffer<float4> inputBuffer;
+[numthreads(1,1,1)]
+void computeMain()
+{
+    bool4 bv = inputBuffer[0];
+    outputBuffer[0] = bv.x;
+    outputBuffer[1] = bv.y;
+    outputBuffer[2] = bv.z;
+    outputBuffer[3] = bv.w;
+    bool b = inputBuffer[0].y;
+    outputBuffer[4] = b;
+}
+
+// CHECK: 0
+// CHECK: 1
+// CHECK: 1
+// CHECK: 1
+// CHECK: 1
\ No newline at end of file
-- 
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