bitcast require the input has same width with result type (#7018)

bitcast requires the input has same width with result type, this PR ensures that we always lower the bitcast IR instruction satisfies this requirement.

Close #7017.

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/language-feature/bit-cast/float-bit-cast.slang b/tests/language-feature/bit-cast/float-bit-cast.slang
new file mode 100644
index 000000000..66b6812c4
--- /dev/null
+++ b/tests/language-feature/bit-cast/float-bit-cast.slang
@@ -0,0 +1,32 @@
+//TEST(compute, vulkan):COMPARE_COMPUTE(filecheck-buffer=BUF):-vk
+
+struct MyStruct
+{
+    half a;
+    half b;
+}
+
+
+
+//TEST_INPUT:set inputBuffer = ubuffer(data=[1.0 3.0 4.0], stride=4)
+RWStructuredBuffer<float> inputBuffer;
+
+
+//TEST_INPUT:ubuffer(data=[0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<uint> outputBuffer;
+
+[shader("compute")]
+void computeMain()
+{
+    vector<float, 1> a = {inputBuffer[0]};
+
+    outputBuffer[0] = bit_cast<uint>(a);
+    // BUF: 3F800000
+
+    MyStruct s = MyStruct(half(inputBuffer[1]), half(inputBuffer[2]));
+    outputBuffer[1] = bit_cast<uint>(s);
+    // 2.0 : 0x4000
+    // 3.0 : 0x4200
+    // BUF-NEXT: 44004200
+
+}